Vission 20/20 micro-controller
Operation and service manual • Version 1.9
Table of Contents
Section Title
Section Number
How To Use This Manual......................................................................................................................... TOC-9
Standard Vilter Warranty Statement ...................................................................................................... TOC-10
Section 1 • Operational Flow Charts
Requirements to Start Compressor ........................................................................................................ 1-1
Critical Compressor Run Logic at Compressor Start................................................................................ 1-1
Compressor Amperage Load Limiting .................................................................................................... 1-1
Figure 1-1. Operational Flow Charts ....................................................................................................... 1-1
High Discharge Pressure Load Limiting.................................................................................................. 1-1
Suction Pressure Override Load Limit During Temperature Control ........................................................ 1-2
Section 2 • Installation Recommendations
Proper Wiring Sizing .............................................................................................................................. 2-1
Voltage Source ...................................................................................................................................... 2-1
Figure 2-1. Vission 20/20 with Individual Transformer ............................................................................ 2-1
Figure 2-2. EMI and Vission 20/20 .......................................................................................................... 2-1
Grounding ............................................................................................................................................. 2-2
Mixing Voltages ..................................................................................................................................... 2-2
DC signals.............................................................................................................................................. 2-2
Figure 2-3. Ground Wiring ..................................................................................................................... 2-2
Figure 2-4. Mixed Voltage Wiring........................................................................................................... 2-2
Wiring Methods..................................................................................................................................... 2-3
Figure 2-5. Correct Transformer Wiring Method .................................................................................... 2-3
Figure 2-6. Incorrect Transformer Wiring Method .................................................................................. 2-3
Best Practices......................................................................................................................................... 2-4
Section 3 • Hardware Architecture
Overview ............................................................................................................................................... 3-1
Figure 3-1. Hardware Architecture Overview ......................................................................................... 3-1
Digital Input/Output (I/O)...................................................................................................................... 3-2
Table 3-1. Digital I/O .............................................................................................................................. 3-3
Analog Inputs ........................................................................................................................................ 3-4
Table 3-2. Analog Inputs......................................................................................................................... 3-5
Analog Outputs ..................................................................................................................................... 3-6
Digital & Analog I/O Boards Layout......................................................................................................... 3-7
Table 3-3. Analog Outputs...................................................................................................................... 3-7
Figure 3-2. Digital I/O Board Layout........................................................................................................ 3-7
Digital Outpout Boards .......................................................................................................................... 3-8
Figure 3-3. Digital Output Board Layout................................................................................................. 3-8
Digital Input Boards ............................................................................................................................... 3-9
Figure 3-4. Digital Input Board Layout .................................................................................................... 3-9
Digital In-Out Boards ............................................................................................................................. 3-10
Figure 3-5. Digital Input-Output Board Layout........................................................................................ 3-10
Analog Input Boards .............................................................................................................................. 3-11
Figure 3-6. Analog Input Board Layout ................................................................................................... 3-11
Analog Input Jumper Tables ................................................................................................................... 3-12
Table 3-4. Analog Input Jumper Tables................................................................................................... 3-12
Analog Output Boards ........................................................................................................................... 3-14
Figure 3-7. Analog Output Board Layout ................................................................................................ 3-14
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 1
Table of Contents
Section Title
Section Number
Section 4 • Main Screen
Overview ............................................................................................................................................... 4-1
Figure 4-1. Main Screen.......................................................................................................................... 4-1
Top Status Bar........................................................................................................................................ 4-2
Figure 4-2. Top Status Bar ...................................................................................................................... 4-2
Parameter Bar........................................................................................................................................ 4-3
Figure 4-3. Parameter Bar ...................................................................................................................... 4-3
Figure 4-4. Unit Start Pop-Up Window ................................................................................................... 4-4
Bottom Status Bar.................................................................................................................................. 4-5
Figure 4-5. Bottom Status Bar ................................................................................................................ 4-5
Splash Screen......................................................................................................................................... 4-6
Figure 4-6. Splash Screen ....................................................................................................................... 4-6
Section 5 • Menu Screen
Overview ............................................................................................................................................... 5-1
Navigation Buttons ................................................................................................................................ 5-1
Figure 5-1. Menu Screen ........................................................................................................................ 5-1
Figure 5-2. Menu Screen with Remote Oil Cooler Enabled....................................................................... 5-2
Section 6 • Compressor Control
Overview ............................................................................................................................................... 6-1
Suction Pressure Control and Process Temperature Control ................................................................... 6-1
Figure 6-1. Compressor Control Screen - Suction Pressure Control ......................................................... 6-1
Auto-Cycle ............................................................................................................................................. 6-2
Figure 6-2. Compressor Control Screen - Process Temperature Control .................................................. 6-2
Figure 6-3. Proportional Band & Setpoint ............................................................................................... 6-3
Variable Frequency Drive (VFD).............................................................................................................. 6-4
Figure 6-4. Compressor Control Screen - VFD Settings Control ............................................................... 6-4
Figure 6-5. VFD One-Step Control Method ............................................................................................. 6-5
Figure 6-6. VFD Two-Step Control Method ............................................................................................. 6-5
Pumpdown Control................................................................................................................................ 6-6
Figure 6-7. Compressor Control Screen - Pumpdown/Pulldown Control ................................................ 6-6
Pulldown Control ................................................................................................................................... 6-7
Control Mode......................................................................................................................................... 6-8
Figure 6-8. Compressor Control Screen - Misc. 1 (Control Mode)............................................................ 6-8
Stop load & Force unload ....................................................................................................................... 6-8
Figure 6-9. Compressor Control Screen - Misc. 2 (Economizer & Hot Gas Bypass Control) ....................... 6-9
Capacity Slide Triggered Outputs........................................................................................................... 6-9
Volume Slide Position Offset .................................................................................................................. 6-10
Soft Load ............................................................................................................................................... 6-10
Load Anticipating................................................................................................................................... 6-10
Oil Control ............................................................................................................................................. 6-11
Figure 6-10. Compressor Control Screen - Oil Control & Liquid Injection Control .................................... 6-11
Liquid Injection ...................................................................................................................................... 6-11
Section 7 • Alarms and Trips
Overview ............................................................................................................................................... 7-1
Alarms and Trips Setpoints..................................................................................................................... 7-1
Figure 7-1. Alarms and Trips Screen - Page 1........................................................................................... 7-1
Figure 7-2. Alarms and Trips Screen - Page 1 as Level 2 User.................................................................... 7-2
Figure 7-2. Alarms and Trips Screen - Page 2........................................................................................... 7-3
Figure 7-2. Alarms and Trips Screen - Page 3 .......................................................................................... 7-4
Compressor Inhibits............................................................................................................................... 7-5
Safety Failure Messages ......................................................................................................................... 7-5
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 2
Table of Contents
Section Title
Section Number
Compressor Warnings............................................................................................................................ 7-6
Section 8 • Timers
Overview ............................................................................................................................................... 8-1
Timer Setpoints ..................................................................................................................................... 8-1
Figure 8-1. Timers Screen - Page 1.......................................................................................................... 8-1
Figure 8-2. Timers Screen - Page 2.......................................................................................................... 8-3
Section 9 • Compressor Scheduling
Overview ............................................................................................................................................... 9-1
Scheduling Setpoint............................................................................................................................... 9-1
Figure 9-1. Compressor Scheduling Screen ............................................................................................ 9-1
Section 10 • Compressor Sequencing
Overview ............................................................................................................................................... 10-1
Pressure / Temperature Control Setpoints.............................................................................................. 10-1
Figure 10-1. Compressor Sequencing Screen - Page 1 ............................................................................10-1
Capacity Load/Unload Timers ................................................................................................................ 10-2
Figure 10-2. Compressor Sequencing Screen - Page 2 ............................................................................10-2
Compressor Sequencing Table ............................................................................................................... 10-3
Figure 10-3. Compressor Sequencing Screen - Page 3 ............................................................................10-3
Table 10-1. Status Symbols .................................................................................................................... 10-4
Section 11 • Condenser Control
Overview ............................................................................................................................................... 11-1
Condenser Control Setpoint................................................................................................................... 11-1
Figure 11-1. Condenser Control Screen - Page 1 ..................................................................................... 11-1
Step Control........................................................................................................................................... 11-2
VFD Settings .......................................................................................................................................... 11-3
Figure 11-2. Condenser Control Screen - Page 2 ..................................................................................... 11-4
Section 12 • Service Options
Overview ............................................................................................................................................... 12-1
Digital Outputs ...................................................................................................................................... 12-1
Figure 12-1. Service Options Screen - Digital Outputs (Page 1)............................................................... 12-1
Figure 12-2. Service Options Screen - Digital Outputs (Page 2)............................................................... 12-2
Figure 12-3. Service Options Screen - Digital Outputs (Page 3)............................................................... 12-3
Figure 12-4. Service Options Screen - Digital Outputs for Remote Oil Cooler (Page 3)............................. 12-4
Analog Outputs ..................................................................................................................................... 12-5
Figure 12-5. Service Options Screen - Analog Outputs (Page 4) .............................................................. 12-5
Section 13 • Instruments Calibration
Overview ............................................................................................................................................... 13-1
Pressure and Temperature Inputs........................................................................................................... 13-1
Figure 13-1. Instruments Calibration Screen - Analog Inputs (Page 1)..................................................... 13-1
Motor Current........................................................................................................................................ 13-2
Figure 13-2. Instruments Calibration Screen - Analog Inputs (Page 2) .................................................... 13-2
Figure 13-3. Instruments Calibration Screen - Analog Inputs (Page 3)..................................................... 13-3
Remote Capacity ................................................................................................................................... 13-4
Figure 13-4. Instruments Calibration Screen - Analog Inputs (Page 4)..................................................... 13-4
Analog Inputs ........................................................................................................................................ 13-4
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 3
Table of Contents
Section Title
Section Number
Figure 13-5. Instruments Calibration Screen - Analog Inputs (Page 5)..................................................... 13-5
Analog Outputs ..................................................................................................................................... 13-6
Figure 13-6. Instruments Calibration Screen - Analog Outputs (Page 6).................................................. 13-6
Section 14 • Slide Calibration
Overview ............................................................................................................................................... 14-1
Capacity Slide Valve Potentiometer........................................................................................................ 14-1
Figure 14-1. Slide Calibration Screen...................................................................................................... 14-1
Volume Slide Valve Potentiometer ......................................................................................................... 14-2
Slide Valve Operation............................................................................................................................. 14-2
Slide Valve Actuator Calibration for Optical Style Motors........................................................................ 14-2
Figure 14-2. Photochopper .................................................................................................................... 14-3
Command Shaft Rotation....................................................................................................................... 14-4
Table 14-1. Command Shaft Rotation Required By Actuator................................................................... 14-4
Slide Valve Troubleshooting Guide ......................................................................................................... 14-5
Table 14-2. Slide Valve Troubleshooting Guide ....................................................................................... 14-5
Slide Valve Actuator Troubleshooting Guide Blink Code .........................................................................14-7
Table 14-3. LED Blink Codes and Troubleshooting Guide.........................................................................14-7
Section 15 • Trend Chart
Overview ............................................................................................................................................... 15-1
Chart Operation..................................................................................................................................... 15-1
Figure 15-1. Trend Chart Screen ............................................................................................................. 15-1
Trend Data Storage ................................................................................................................................ 15-2
Setup .................................................................................................................................................. 15-3
Figure 15-2. Trend Setup Screen............................................................................................................. 15-3
Section 16 • Event List
Overview ............................................................................................................................................... 16-1
Event list Columns.................................................................................................................................. 16-1
Figure 16-1. Event List Screen................................................................................................................. 16-1
Section 17 • Input / Output
Overview ............................................................................................................................................... 17-1
Figure 17-1. Input/Output Screen - Page 1 ............................................................................................. 17-1
Figure 17-2. Input/Output Screen - Page 2 ............................................................................................. 17-2
Figure 17-3. Input/Output Screen - Page 3 ............................................................................................. 17-2
Figure 17-4. Input/Output Screen - Page 4 ............................................................................................. 17-3
Figure 17-5. Input/Output Screen - Page 4 (Remote Oil Cooler Enabled)................................................. 17-3
Figure 17-6. Input/Output Screen - Freeze Data Page ............................................................................. 17-4
Section 18 • Auxiliary Input / Output
Overview ............................................................................................................................................... 18-1
Digital Inputs ......................................................................................................................................... 18-1
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page 1) ....................................................................... 18-1
Digital Outputs ...................................................................................................................................... 18-2
Analog Inputs ........................................................................................................................................ 18-2
Figure 18-2. Auxiliary I/O Screen - Digital Outputs (Page 2) .................................................................... 18-3
Figure 18-3. Auxiliary I/O Screen - Analog Inputs (Page 3) ...................................................................... 18-3
Analog Outputs ..................................................................................................................................... 18-4
Control .................................................................................................................................................. 18-4
Figure 18-4. Auxiliary I/O Screen - Analog Inputs (Page 4) ...................................................................... 18-5
Figure 18-5. Auxiliary I/O Screen - Analog Inputs (Page 5) ...................................................................... 18-5
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 4
Table of Contents
Section Title
Section Number
Section 19 • Configuration
Overview ............................................................................................................................................... 19-1
Units .................................................................................................................................................. 19-1
Figure 19-1. Confi guration Screen - Initial Setup (Page 1) ...................................................................... 19-1
Time & Date........................................................................................................................................... 19-2
Communications ................................................................................................................................... 19-2
Touchscreen .......................................................................................................................................... 19-2
Anti-Recycle........................................................................................................................................... 19-3
Restart On Power Failure........................................................................................................................ 19-3
Compressor Sequencing ........................................................................................................................ 19-4
Language............................................................................................................................................... 19-4
Model & Refrigerant............................................................................................................................... 19-4
Figure 19-2. Confi guration Screen - Compressor Sequencing (Page 2)................................................... 19-4
Figure 19-2. Configuration Screen - Page 2............................................................................................. 19-4
Compressor Control............................................................................................................................... 19-5
Optional Function Selection................................................................................................................... 19-5
Condenser Control................................................................................................................................. 19-5
Oil Pump................................................................................................................................................ 19-5
Oil Cooling............................................................................................................................................. 19-6
Motor Current Device ............................................................................................................................ 19-6
Digital Inputs ......................................................................................................................................... 19-7
Figure 19-3. Confi guration Screen - Digital Auxiliaries (Page 3) ............................................................. 19-7
Analog Inputs ........................................................................................................................................ 19-8
Figure 19-4. Confi guration Screen - Analog Auxiliaries (Page 4) ............................................................. 19-8
Analog Outputs ..................................................................................................................................... 19-9
Digital Outputs ...................................................................................................................................... 19-9
Figure 19-5. Confi guration Screen - Analog and Digital Outputs (Page 5) .............................................. 19-9
I/O Configuration................................................................................................................................... 19-10
Figure 19-6. Confi guration Screen - I/O Confi guration (Page 6)............................................................. 19-10
Section 20 • Data Backup
Overview ............................................................................................................................................... 20-1
Save / Load............................................................................................................................................. 20-1
Figure 20-1. Data Backup Screen - Save/Load ......................................................................................... 20-1
Migrate.................................................................................................................................................. 20-3
Factory Reset ......................................................................................................................................... 20-3
Figure 20-2. Data Backup Screen - Migrate and Factory Reset................................................................. 20-3
Section 21 • Maintenance
Overview ............................................................................................................................................... 21-1
Checklist................................................................................................................................................ 21-1
Figure 21-1. Maintenance Screen - Checklist .......................................................................................... 21-1
Notes .................................................................................................................................................. 21-2
Log
.................................................................................................................................................. 21-2
Chart .................................................................................................................................................. 21-2
Figure 21-2. Maintenance Screen - Log................................................................................................... 21-2
Figure 21-3. Maintenance Screen - Chart................................................................................................ 21-3
Section 22 • User Access
Overview ............................................................................................................................................... 22-1
Apply .................................................................................................................................................. 22-1
Figure 22-1. User Access Screen - Login .................................................................................................. 22-1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 5
Table of Contents
Section Title
Section Number
Login .................................................................................................................................................. 22-2
Manage Accounts .................................................................................................................................. 22-2
Figure 22-2. User Access Screen - Manage Accounts............................................................................... 22-2
VNC Account ......................................................................................................................................... 22-3
Figure 22-3. User Access Screen - VNC Accounts..................................................................................... 22-3
Screen Security Levels............................................................................................................................ 22-4
Table 22-1. Security Access Levels .......................................................................................................... 22-4
Section 23 • Help Screen
Overview ............................................................................................................................................... 23-1
Screen Features ..................................................................................................................................... 23-1
Figure 23-1. Help Screen - Manual.......................................................................................................... 23-1
Figure 23-2. Help Screen - USB ............................................................................................................... 23-2
Figure 23-2. Version Pop-Up Screen ....................................................................................................... 23-2
Section 24 • Twin Screw Control
Overview ............................................................................................................................................... 24-1
Setup - Configuration Screen ................................................................................................................. 24-1
Figure 24-1. Configuration Screen - Twin Screw Option.......................................................................... 24-1
Operation .............................................................................................................................................. 24-2
Slide Calibration - Capacity Slide Valve Potentiometer............................................................................ 24-2
Figure 24-2. Slide Calibration - Twin Screw Control................................................................................. 24-2
Figure 24-3. Slide Calibration - Twin Screw Bump Pop-Up Window......................................................... 24-3
Section 25 • Cool Compression Control
Overview ............................................................................................................................................... 25-1
Setup .................................................................................................................................................. 25-1
Figure 25-1. Cool Compression Control Screen....................................................................................... 25-1
Control Functions .................................................................................................................................. 25-2
Figure 25-2. Compressor Control Screen - Cool Compression Control (Page 4) ....................................... 25-2
Operational Differences from Single Screw ............................................................................................ 25-3
Section 26 • Remote Oil Cooler
Overview ............................................................................................................................................... 26-1
Remote Oil Cooler Setpoint.................................................................................................................... 26-1
Figure 26-1. Remote Oil Cooler Screen (Page 1) ..................................................................................... 26-1
Step Control........................................................................................................................................... 26-2
VFD Settings .......................................................................................................................................... 26-2
Figure 26-2. Remote Oil Cooler VFD Screen (Page 2) .............................................................................. 26-3
Appendix A • Vission 20/20 Troubleshooting Guide
Vission 20/20 Troubleshooting Guide..................................................................................................... A-1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
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List of Tables and Figures
Table/Figure
Page Number
Table 3-1. Digital I/O .............................................................................................................................. 3-3
Table 3-2. Analog Inputs......................................................................................................................... 3-5
Table 3-3. Analog Outputs...................................................................................................................... 3-7
Table 3-4. Analog Input Jumper Tables................................................................................................... 3-12
Table 10-1. Status Symbols .................................................................................................................... 10-4
Table 14-1. Command Shaft Rotation Required By Actuator................................................................... 14-4
Table 14-2. Slide Valve Troubleshooting Guide ....................................................................................... 14-5
Table 14-3. LED Blink Codes and Troubleshooting Guide.........................................................................14-7
Table 22-1. Security Access Levels .......................................................................................................... 22-4
Table A. Vission 20/20 Troubleshooting Guide........................................................................................ A-1
Figure 1-1. Operational Flow Charts ....................................................................................................... 1-1
Figure 2-1. Vission 20/20 with Individual Transformer ............................................................................ 2-1
Figure 2-2. EMI and Vission 20/20 .......................................................................................................... 2-1
Figure 2-3. Ground Wiring ..................................................................................................................... 2-2
Figure 2-4. Mixed Voltage Wiring........................................................................................................... 2-2
Figure 2-5. Correct Transformer Wiring Method .................................................................................... 2-3
Figure 2-6. Incorrect Transformer Wiring Method .................................................................................. 2-3
Figure 3-1. Hardware Architecture Overview ......................................................................................... 3-1
Figure 3-2. Digital I/O Board Layout........................................................................................................ 3-7
Figure 3-3. Digital Output Board Layout................................................................................................. 3-8
Figure 3-4. Digital Input Board Layout .................................................................................................... 3-9
Figure 3-5. Digital Input-Output Board Layout........................................................................................ 3-10
Figure 3-6. Analog Input Board Layout ................................................................................................... 3-11
Figure 3-7. Analog Output Board Layout ................................................................................................ 3-14
Figure 4-1. Main Screen.......................................................................................................................... 4-1
Figure 4-2. Top Status Bar ...................................................................................................................... 4-2
Figure 4-3. Parameter Bar ...................................................................................................................... 4-3
Figure 4-4. Unit Start Pop-Up Window ................................................................................................... 4-4
Figure 4-5. Bottom Status Bar ................................................................................................................ 4-5
Figure 4-6. Splash Screen ....................................................................................................................... 4-6
Figure 5-1. Menu Screen ........................................................................................................................ 5-1
Figure 5-2. Menu Screen with Remote Oil Cooler Enabled....................................................................... 5-2
Figure 6-1. Compressor Control Screen - Suction Pressure Control ......................................................... 6-1
Figure 6-2. Compressor Control Screen - Process Temperature Control .................................................. 6-2
Figure 6-3. Proportional Band & Setpoint ............................................................................................... 6-3
Figure 6-4. Compressor Control Screen - VFD Settings Control ............................................................... 6-4
Figure 6-5. VFD One-Step Control Method ............................................................................................. 6-5
Figure 6-6. VFD Two-Step Control Method ............................................................................................. 6-5
Figure 6-7. Compressor Control Screen - Pumpdown/Pulldown Control ................................................ 6-6
Figure 6-8. Compressor Control Screen - Misc. 1 (Control Mode)............................................................ 6-8
Figure 6-9. Compressor Control Screen - Misc. 2 (Economizer & Hot Gas Bypass Control) ....................... 6-9
Figure 6-10. Compressor Control Screen - Oil Control & Liquid Injection Control .................................... 6-11
Figure 7-1. Alarms and Trips Screen - Page 1........................................................................................... 7-1
Figure 7-2. Alarms and Trips Screen - Page 1 as Level 2 User.................................................................... 7-2
Figure 7-2. Alarms and Trips Screen - Page 2........................................................................................... 7-3
Figure 7-2. Alarms and Trips Screen - Page 3 .......................................................................................... 7-4
Figure 8-1. Timers Screen - Page 1.......................................................................................................... 8-1
Figure 8-2. Timers Screen - Page 2.......................................................................................................... 8-3
Figure 9-1. Compressor Scheduling Screen ............................................................................................ 9-1
Figure 10-1. Compressor Sequencing Screen - Page 1 ............................................................................10-1
Figure 10-2. Compressor Sequencing Screen - Page 2 ............................................................................10-2
Figure 10-3. Compressor Sequencing Screen - Page 3 ............................................................................10-3
Figure 11-1. Condenser Control Screen - Page 1 ..................................................................................... 11-1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 7
List of Tables and Figures
Table/Figure
Page Number
Figure 11-2. Condenser Control Screen - Page 2 ..................................................................................... 11-4
Figure 12-1. Service Options Screen - Digital Outputs (Page 1)............................................................... 12-1
Figure 12-2. Service Options Screen - Digital Outputs (Page 2)............................................................... 12-2
Figure 12-3. Service Options Screen - Digital Outputs (Page 3)............................................................... 12-3
Figure 12-4. Service Options Screen - Digital Outputs for Remote Oil Cooler (Page 3)............................. 12-4
Figure 12-5. Service Options Screen - Analog Outputs (Page 4) .............................................................. 12-5
Figure 13-1. Instruments Calibration Screen - Analog Inputs (Page 1)..................................................... 13-1
Figure 13-2. Instruments Calibration Screen - Analog Inputs (Page 2) .................................................... 13-2
Figure 13-3. Instruments Calibration Screen - Analog Inputs (Page 3)..................................................... 13-3
Figure 13-4. Instruments Calibration Screen - Analog Inputs (Page 4)..................................................... 13-4
Figure 13-5. Instruments Calibration Screen - Analog Inputs (Page 5)..................................................... 13-5
Figure 13-6. Instruments Calibration Screen - Analog Outputs (Page 6).................................................. 13-6
Figure 14-1. Slide Calibration Screen...................................................................................................... 14-1
Figure 14-2. Photochopper .................................................................................................................... 14-3
Figure 15-1. Trend Chart Screen ............................................................................................................. 15-1
Figure 15-2. Trend Setup Screen............................................................................................................. 15-3
Figure 16-1. Event List Screen................................................................................................................. 16-1
Figure 17-1. Input/Output Screen - Page 1 ............................................................................................. 17-1
Figure 17-2. Input/Output Screen - Page 2 ............................................................................................. 17-2
Figure 17-3. Input/Output Screen - Page 3 ............................................................................................. 17-2
Figure 17-4. Input/Output Screen - Page 4 ............................................................................................. 17-3
Figure 17-5. Input/Output Screen - Page 4 (Remote Oil Cooler Enabled)................................................. 17-3
Figure 17-6. Input/Output Screen - Freeze Data Page ............................................................................. 17-4
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page 1) ....................................................................... 18-1
Figure 18-2. Auxiliary I/O Screen - Digital Outputs (Page 2) .................................................................... 18-3
Figure 18-3. Auxiliary I/O Screen - Analog Inputs (Page 3) ...................................................................... 18-3
Figure 18-4. Auxiliary I/O Screen - Analog Inputs (Page 4) ...................................................................... 18-5
Figure 18-5. Auxiliary I/O Screen - Analog Inputs (Page 5) ...................................................................... 18-5
Figure 19-1. Confi guration Screen - Initial Setup (Page 1) ...................................................................... 19-1
Figure 19-2. Confi guration Screen - Compressor Sequencing (Page 2)................................................... 19-4
Figure 19-2. Configuration Screen - Page 2............................................................................................. 19-4
Figure 19-3. Confi guration Screen - Digital Auxiliaries (Page 3) ............................................................. 19-7
Figure 19-4. Confi guration Screen - Analog Auxiliaries (Page 4) ............................................................. 19-8
Figure 19-5. Confi guration Screen - Analog and Digital Outputs (Page 5) .............................................. 19-9
Figure 19-6. Confi guration Screen - I/O Confi guration (Page 6)............................................................. 19-10
Figure 20-1. Data Backup Screen - Save/Load ......................................................................................... 20-1
Figure 20-2. Data Backup Screen - Migrate and Factory Reset................................................................. 20-3
Figure 21-1. Maintenance Screen - Checklist .......................................................................................... 21-1
Figure 21-2. Maintenance Screen - Log................................................................................................... 21-2
Figure 21-3. Maintenance Screen - Chart................................................................................................ 21-3
Figure 22-1. User Access Screen - Login .................................................................................................. 22-1
Figure 22-2. User Access Screen - Manage Accounts............................................................................... 22-2
Figure 22-3. User Access Screen - VNC Accounts..................................................................................... 22-3
Figure 23-1. Help Screen - Manual.......................................................................................................... 23-1
Figure 23-2. Help Screen - USB ............................................................................................................... 23-2
Figure 23-2. Version Pop-Up Screen ....................................................................................................... 23-2
Figure 24-1. Configuration Screen - Twin Screw Option.......................................................................... 24-1
Figure 24-2. Slide Calibration - Twin Screw Control................................................................................. 24-2
Figure 24-3. Slide Calibration - Twin Screw Bump Pop-Up Window......................................................... 24-3
Figure 25-1. Cool Compression Control Screen....................................................................................... 25-1
Figure 25-2. Compressor Control Screen - Cool Compression Control (Page 4) ....................................... 25-2
Figure 26-1. Remote Oil Cooler Screen (Page 1) ..................................................................................... 26-1
Figure 26-2. Remote Oil Cooler VFD Screen (Page 2) .............................................................................. 26-3
END OF TOC
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 8
How to Use This Manual
This manual contains instructions for the Vission 20/20
Operation & Service Manual. It has been divided into 27
sections.
WARNING - Warning statements are shown when there
are hazardous situations, if not avoided, will result in se-
rious injury or death.
Section 1: Operational Flow Charts
Section 2: Installation Recommendations
Section 3: Hardware Architecture
Section 4: Main Screen
CAUTION - Caution statements are shown when there
are potentially hazardous situations, if not avoided, will
result in damage to equipment.
NOTE - Notes are shown when there are addtional infor-
mation pertaining to the instructions explained.
Section 5: Menu Screen
Section 6: Compressor Control
Section 7: Alarms & Trips
NOTICE - Notices are shown when there are important
information that can help avoid system failure.
Section 8: Timers
Section 9: Compressor Scheduling
Section 10: Compressor Sequencing
Section 11: Condensor Control
Section 12: Service Options
Section 13: Instruments Calibration
Section 14: Slide Calibration
Section 15: Trend Chart
For additional information pertaining to the Vission
20/20, refer to www.Vission2020.net/documents.
Information that can be found on the site are:
• Manuals
• Release Advisories
• Application Notes
• Videos
Section 16: Event List
Section 17: Input/Output
Section 18: Auxiliary Input/Output
Section 19: Configuration
Section 20: Data Backup
Section 21: Maintenance
Section 22: User Access
Section 23: Help Screen
Section 24: Twin Screw Control
Section 25: Cool Compression Control
Section 26: Remote Oil Cooler
Appendix A: Vission 20/20 Troubleshooting Guide
It is highly recommended that the manual be reviewed
prior to servicing the Vission 20/20 system parts.
Figures and tables are included to illustrate key concepts.
Safety precautions are shown throughout the manual.
They are defined as the following:
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 9
Standard Vilter Warranty Statement
Seller warrants the products it manufactures to be free from defects in material and workmanship for a period of eigh-
teen (18) months from the date of shipment from Seller’s manufacturing plant or twelve (12) months from date of
installation at the initial end users location, whichever occurs first. In addition, Seller provides the following extended
warranties: (a) three (3) years from the date of shipment on single screw compressor internal rotating parts, (b) two
(2) years from the date of shipment on reciprocating compressors and single screw and reciprocating compressor
parts, and (c) two (2) years on all other parts on a single screw compressor unit. Such warranties do not apply to
ordinary wear and tear. Seller does not warrant that the product complies with any particular law or regulation not ex-
plicitly set forth in the specifications, and Buyer is responsible for ensuring that the product contains all features nec-
essary to safely perform in Buyer’s and its customer’s plants and operations. Buyer must notify Seller of any warranty
claim within ten (10) days after such claim arises, otherwise Buyer waives all rights to such claim. Products supplied
by Seller, which are manufactured by others, are not warranted by Seller, but rather Seller merely passes through the
manufacturer’s warranty to Buyer.
SELLER EXPRESSLY DISCLAIMS ALL OTHER WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Unless otherwise agreed in writing, Buyer’s sole remedy for breach of warranty is, at Seller’s option, the re-pair of the
defect, the correction of the service, or the providing a replacement part FOB Seller’s office. Seller will not be respon-
sible for costs of dismantling, lost refrigerant, reassembling, or transporting the product. Further, Seller will not be
liable for any other direct, indirect, consequential, incidental, or special damages arising out of a breach of warranty.
THESE WARRANTY REMEDIES ARE EXCLUSIVE AND ALL OTHER WARRANTY REMEDIES ARE EXCLUDED. Products or
parts for which a warranty claim is made are to be returned transportation prepaid to Seller’s factory. Any improper
use, corrosion, neglect, accident, operation beyond rated capacity, substitution of parts not approved by Seller, or
any alteration or repair by others which, in Seller’s judgement, adversely affects the Product, shall void all warranties
and warranty obligations. Further, Seller shall not be liable under the above warranties should Buyer be in default of its
payment obligations to Seller under this Agreement or any credit agreement.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
TOC - 10
Section 1 • Operational Flow Charts
Requirements to Start Compressor
Volume and
Capacity slides are
less than 5%
Oil Separator Temp
>Oil Sep Start Trip
Setpt
Filter Diff Press <
Start Filter Diff Trip
Setpt
Oil Pump On: Prelub Oil Press is > Prelub Oil
Press Reset Setpt for “Min Compressor Prelub Timer”
setting (typically 5 seconds)
Start Compressor
Critical Compressor Run Logic at Compressor Start
Start
Compressor
Is
Is
“Oil Press
Run Oil Press>
Run Oil Press
Reset setpt?
(Default 40 PSI)
Run Oil Press>
Bypass at Comp
Prelub Oil Press
Reset setpt?
Yes
Yes
Start”timer
expires (60 sec
after start)
(Default 5 PSI)
No
No
Run Oil Press Failure
Run Oil Press Failure
Yes
Is
Is Filter Diff >
Hi Filter Diff Press Run
Trip Setpt
Oil Separator Temp
“Filter Diff Press Safety
Changeover”timer expires
(60 sec after start)
Oil Sep Temp > Lo
Oil Sep Run Reset
setpt?
Safety Changeover
Timer expires (5 min
after start)
Yes
Yes
Run
No
for 5 seconds
No
Yes
Lo Run Oil Sep Temp Failure
Run Filter Diff Press Failure
Compressor Amperage Load Limiting
High Discharge Pressure Load Limiting
Is
Is
Capacity Increase
Motor Amps >
Capacity Increase
Disabled
Dsch Press >
Cutin (ON)
Setpt?
Yes
Yes
Disabled
FLA (ON)
Setpt?
No
No
Is
Is
Capacity Decrease until
Dsch Press < ON Setpt x
1.0625
Capacity Decrease
Motor Amps >
Dsch Press >
Cutout (OFF)
Setpt?
Yes
Yes
until Amps < FLA x
1.0625
FLA (OFF)
Setpt?
Normal Loading and
Unloading
Normal Loading and
Unloading
No
No
Figure 1-1. Operational Flow Charts (1 of 2)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
1 – 1
Section 1 • Operational Flow Charts
Suction Pressure Override Load Limit During Temperature Control
Is
Suction Press <
Suct Press Cap
Dec OFF
Capacity Increase
Disabled
Yes
Setpt?
No
Is
Suction Press <
Suct Press Cap
Dec ON
Decrease compressor capacity until Suction
Press > Suction Press Cap Decrease ON setpoint.
Yes
No
Setpt?
Normal Loading and
Unloading
Figure 1-1. Operational Flow Charts (2 of 2)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
1 – 2
Section 2 • Installation Recommendations
Electro-Magnetic Interference (EMI). The Vilter
Vission 20/20 should be isolated with its own con-
trol transformer for the most reliable operation, see
Figure 2-1. Vission 20/20 with Individual Transformer.
Proper Wiring Sizing
• Always size wire gauges as specified by the National
Electrical Code (NEC) for electronic control devices.
• For improved noise immunity, install one size larger
wire gauge than the NEC requirement to assure am-
ple current-carrying capability.
• Connecting the Vilter Vission 20/20 to breaker panels
and central control transformers exposes the Vission
20/20 to large amounts of EMI emitted from the
other devices connected to the secondary terminals
of the transformer. This practice should be avoided if
possible, see Figure 2-2. EMI and Vission 20/20.
• Never under size wire gauges.
Voltage Source
• Transformers block
a
large percentage of
Figure 2-1. Vission 20/20 with Individual Transformer
Figure 2-2. EMI and Vission 20/20
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
2 – 1
Section 2 • Installation Recommendations
• Each voltage level must be run in separate conduit:
Grounding
• Continuous grounds must be run from the util-
ity ground to the Vission 20/20, see Figure 2-3.
Grounding.
• 460 VAC
• 230 VAC
• 120 VAC
• 24 VAC
• DC Signals
• If your installation site has wire-ways or conduit trays,
dividers must be installed between the different
voltages.
• Grounds must be copper or aluminum wire.
• Never use conduit grounds.
Mixing Voltages
DC signals
• Separate different voltages from each other and
separate AC from DC, see Figure 2-4. Mixed Voltage
Wiring.
• If your installation site has wire-ways or conduit trays,
dividers must be installed between the different
voltages.
Figure 2-3. Ground Wiring
Figure 2-4. Mixed Voltage Wiring
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
2 – 2
Section 2 • Installation Recommendations
Wiring Methods
• Each Vission 20/20 panel should have its own indi-
vidual control transformer, see Figure 2-5. Correct
Transformer Wiring Method and Figure 2-6. Incorrect
Transformer Wiring Method.
Figure 2-5. Correct Transformer Wiring Method
Figure 2-6. Incorrect Transformer Wiring Method
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
2 – 3
Section 2 • Installation Recommendations
Best Practices
• Do:
• Keep AC wires away from circuit boards.
• Always run conduit into the bottom or sides
of an enclosure.
• If the conduit must be placed in the top of an
enclosure, use a water-tight conduit fitting to
keep water from entering the enclosure.
• The Vission 20/20 is supplied with pre-
punched conduit holes. Use them!
• Don’t:
• Don’t run wires through the Vission 20/20
enclosure that are not related to the compres-
sor control.
• Don’t add relays, timers, transformers, etc. in
the Vission 20/20 enclosure without first check-
ing with Vilter.
• Don’t run conduit into the top of an enclosure.
• Don’t run refrigerant tubing inside the
enclosure.
• Don’t drill metal enclosures without taking
proper precautions to protect circuit boards
from damage.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
2 – 4
Section 3 • Hardware Architecture
Overview
The Vission 20/20 control panel utilizes X-86 PC tech-
nology with a Linux operating system. For hardware
architecture, see Figure 3-1. Hardware Architecture
Overview.
The Vission 20/20 has the following attributes:
• Low power, Industrial rated X-86 CPU.
• 15” XGA, high resolution LCD display. (Outdoor view-
able LCD optional).
• 8-wire touch screen operator interface.
• Flexible and expandable I/O.
• NEMA-4 enclosure (NEMA-4X optional).
• Industrial temperature range design.
Figure 3-1. Hardware Architecture Overview
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
3 – 1
Section 3 • Hardware Architecture
Trip Output:
Digital Input/Output (I/O)
Refer to Table 3-1. Digital I/O.
• This output is energized when the system has no
Trips. If a trip is issued, the output de-energizes and
stays de-energized until the trip condition is cleared.
Compressor Start Output:
Slide Valve Setpoint #1 Output (Economizer Port #1):
• When the Vission 20/20 signals the compressor to
start, this output is energized. When the Vission
20/20 signals the compressor to stop, this output is
de-energized.
• Normally used for an economizer solenoid, but could
be used for other devices. When the compressor slide
valve percentage is equal to or greater than “slide
valve set-point #1”, the output is energized. When
the compressor slide valve percentage is less than
“slide valve set-point #1”, the output is de-energized.
Oil Pump Start Output:
• When the Vission 20/20 signals the oil pump to start,
this output is energized. When the Vission 20/20 sig-
nals the oil pump to stop, this output is de-energized.
Slide Valve Setpoint #2 Output (Hot Gas Bypass):
• Normally used for a hot gas solenoid, but could be
used for other devices. When the compressor slide
valve percentage is equal to or greater than “slide
valve set-point #2”, the output is energized. When
the compressor slide valve percentage is less than
“slide valve set-point #2”, the output is de-energized.
Capacity Increase Output:
• This output is only active when the compressor is
running. When the Vission 20/20 determines that
the compressor should increase capacity by moving
the slide valve to a higher percentage, this output is
energized. Once the slide valve reaches 100%, this
output will not energize.
Alarm Output:
• This output is energized when the system has no
alarms. If an alarm is issued, the output de-energizes
and stays de-energized until the alarm condition is
cleared.
Capacity Decrease Output:
• This output is only active when the compressor is
running. When the Vission 20/20 determines that
the compressor should decrease capacity by moving
the slide valve to a lower percentage, this output is
energized. Once the slide valve reaches 0%, this out-
put will not energize.
Economizer Port #2 Output:
• This output is energized when the compressor slide
valve percentage is equal to or greater than slide
valve set-point for economizer port 2. It is de-ener-
gized when the compressor slide valve percentage is
less than slide valve set-point for economizer port 2.
Volume Increase Output:
• This output is only active when the compressor is
running. When the Vission 20/20 determines that
the compressor should increase Volume Index (VI) by
moving the volume slide to a higher percentage, this
output is energized. Once the volume slide reaches
100%, this output will not energize.
Liquid Injection #1 Output:
• The function of this output will differ depending on
what type liquid injection is selected. If the liquid in-
jection solenoid only is chosen, then the output will
energize when discharge temperature is above liquid
injection setpoint #1 and the oil separator tempera-
ture is above the oil separator temperature override
set-point. The output is de-energized when any one
of the above condition is not met.
Volume Decrease Output:
• This output is only active when the compressor is run-
ning. When the Vission 20/20 determines that the
compressor should decrease Volume Index (VI) by
moving the volume slide to a lower percentage, this
output is energized. Once the volume slide reaches
0%, this output will not energize.
• If the compressor has liquid injection with motor-
ized value oil cooling, then this output is energized
when the compressor is running and the discharge
temperature is above the oil separator temperature
override set-point and the oil separator temperature
is above the override setpoint. The output is de-en-
ergized when the discharge temperature falls below
the “on” setpoint minus the solenoid differential or
when oil separator temperature is below the oil sepa-
rator temperature override set-point.
Oil Sump Heater Output:
• This output is active and energized when the oil
separator temperature is lower than the oil separator
temperature setpoint. It is de-energized when the oil
separator temperature is higher than the oil separa-
tor temperature setpoint.
Liquid Injection #2 Output:
• Not Defined
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
3 – 2
Section 3 • Hardware Architecture
Table 3-1. Digital I/O (1 of 2)
Description
Board
I/O #
1
Type
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
Compressor Start
2
Oil Pump Start
3
Capacity Increase
4
Capacity Decrease
5
Volume Increase
6
Volume Decrease
7
Oil Separator Heater
8
Trip indicator (ON=Normal)
Slide Valve Set point #1 (Economizer Port #1)
Slide Valve Set point #2 (Hot Gas Bypass)
Alarm (ON=Normal)
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Economizer Port #2
Liquid Injection #1
Liquid Injection #2
Remote Enabled
Shunt Trip
Comp Motor Starter Auxiliary Contact
High Level Shutdown
INPUT
Oil Level Float Switch #1
Oil Level Float Switch #2
Remote Setpoint #1/#2 Selection
Remote Start/Stop
INPUT
INPUT
INPUT
INPUT
Remote Capacity Increase
Remote Capacity Decrease
Condenser / Remote Oil Cooler Step #1
Condenser / Remote Oil Cooler Step #2
Condenser / Remote Oil Cooler Step #3
Condenser / Remote Oil Cooler Step #4
Auxiliary Input #1
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
Auxiliary Input #2
INPUT
Auxiliary Input #3
INPUT
Auxiliary Input #4
INPUT
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
3 – 3
Section 3 • Hardware Architecture
• The slide valve will continuously increase as long as
this input is energized. The slide valve will not in-
crease when this input is de-energized.
Remote Enabled Output:
• This output is energized when the Vission 20/20
panel is enabled for remote control. If the compres-
sor parameter does not satisfy start conditions or is
placed into the manual stop position, this output is
de-energized.
Remote Capacity Decrease Input:
• Operational only when the compressor is running.
This input is enabled if the compressor is enabled
for remote I/O control. Energizing this input will de-
crease the slide valve position. The slide valve will
continuously decrease as long as this input is ener-
gized. The slide valve will not decrease when this in-
put is de-energized.
Shunt Trip:
• This output is designed to be connected to a master
power breaker with a shunt trip input. If the Vission
20/20 detects the compressor motor is running when
it’s not suppose to be, then this output can be ener-
gized to trip the breaker supplying power to a starter.
Condenser / Remote Oil Cooler Step #1 Output:
• This output is enabled when condenser control or
Remote Oil Cooler option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Comp Motor Starter Auxiliary Contact:
• This input looks for a feedback signal from the com-
pressor starter, confirming that the compressor
starter is energized.
Condenser / Remote Oil Cooler Step #2 Output:
High Level Shutdown Input:
• This output is enabled when condenser control or
Remote Oil Cooler option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
• This input must be energized in order for the com-
pressor to operate. If de-energized, the compressor
will shut down and issue a high level trip.
Oil Level Float Switch #1 Input:
Condenser / Remote Oil Cooler Step #3 Output:
• This input must be energized in order for the com-
pressor to operate. If de-energized, the compressor
will shut down and issue a oil level #1 trip.
• This output is enabled when condenser or Remote
Oil Cooler control option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Oil Level Float Switch #2 Input:
• This input must be energized in order for the com-
pressor to operate. If de-energized, the compressor
will shut down and issue a oil level #2 trip.
Condenser / Remote Oil Cooler Step #4 Output:
• This output is enabled when condenser or Remote
Oil Cooler control option is selected. A condenser /
Remote Oil Cooler fan or pump will be turned on or
off by this output.
Remote Select #1/#2 Input:
• This input enables or disables remote I/O control.
Energizing this input enables the Remote Capacity
Increase and Remote Capacity Decrease inputs.
Auxiliary Inputs #1 - #8:
• Optional inputs that can be configured as an alarm
or trip. Typically connected to external switched
devices.
Remote Start/Stop Input:
• If the compressor is enabled for remote I/O control,
this input is enabled. Energizing this input will issue
a start for the compressor as long as it is available to
run. De-energizing this input stops the compressor.
Auxiliary Outputs #1 - #4:
• Optional inputs that can be configured as an alarm
or trip. Typically connected to external switched
devices.
Remote Capacity Increase Input:
NOTE
The scan interval on the remote increase and
decrease inputs is approximately ONE SECOND.
Please take that into account when developing
a control scheme using the remote increase and
remote decrease inputs for compressor control.
Analog Inputs
Refer to Table 3-2. Analog Inputs.
Motor Current:
• Default is a 0-5 Amp current transformer (CT). Current
transformer ratio is set in the calibration screen.
• If the compressor is enabled for remote I/O control,
this input is enabled. Operational only when the com-
pressor is running. Energizing this input will increase
the slide valve position.
Suction Pressure:
• Default signal is 4-20mA. Suction pressure transducer
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
3 – 4
Section 3 • Hardware Architecture
Table 3-1. Digital I/O (2 of 2)
Description
Board
I/O #
33
Type
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
5
5
5
5
5
5
5
5
Auxiliary Output #1
34
Auxiliary Output #2
Auxiliary Output #3
Auxiliary Output #4
Auxiliary Input #5
Auxiliary Input #6
Auxiliary Input #7
Auxiliary Input #8
35
36
37
38
INPUT
39
INPUT
40
INPUT
Table 3-2. Analog Inputs (1 of 2)
Description
Board
I/O #
1
Type
4-20 mA, 0-5A
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
8
8
8
8
8
8
8
8
9
9
9
Motor Current
2
Suction Pressure
Discharge Pressure
Oil Filter Inlet Pressure
Oil Manifold Pressure
Economizer Pressure
% Slide Valve Position
% Volume Position
Suction Temperature
Discharge Temperature
Oil Separator Temperature
Oil Manifold Temperature
Process Temperature
Chiller Inlet Temperature
Condenser Pressure
Remote Caphold Setpoint
Auxiliary #1
0-5V, 1-5 V, 0-10V, 4-20 mA
3
0-5V, 1-5 V, 0-10V, 4-20 mA
4
0-5V, 1-5 V, 0-10V, 4-20 mA
5
0-5V, 1-5 V, 0-10V, 4-20 mA
6
0-5V, 1-5 V, 0-10V, 4-20 mA
7
0-5V, 4-20 mA, Potentiometer
0-5V, 4-20 mA, Potentiometer
4-20 mA, RTD, ICTD
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
4-20 mA, RTD, ICTD
4-20 mA, RTD, ICTD
4-20 mA, RTD, ICTD
4-20 mA, RTD, ICTD
4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
Auxiliary #2
Auxiliary #3
Auxiliary #4
Auxiliary #5
Auxiliary #6
Auxiliary #7
Auxiliary #8
Auxiliary #9
Auxiliary #10
Auxiliary #11
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
3 – 5
Section 3 • Hardware Architecture
range and calibration is set in the calibration screen.
Discharge Pressure
screen.
Remote Caphold:
• Default signal is 4-20mA. Discharge pressure trans-
ducer range and calibration is set in the calibration
screen.
• Default signal is 4-20mA. Active in “Direct I/O” mode.
Adjusts the capacity of the compressor from 0-100%,
proportional to the 4-20mA signal.
Oil Filter Inlet Pressure:
Auxiliary #1 - #16:
• Default signal is 4-20mA. Oil filter pressure trans-
ducer range and calibration is set in the calibration
screen.
• Flexible analog inputs that can be configured to con-
trol, alarm or trip.
Oil Manifold Pressure:
Analog Outputs:
Refer to Table 3-3. Analog Outputs.
• Default signal is 4-20mA. Oil manifold pressure trans-
ducer range and calibration is set in the calibration
screen.
Compressor VFD:
Economizer Pressure:
• 4-20mA output to control compressor motor speed
with a Variable Frequency Drive (VFD).
• Default signal is 4-20mA. Economizer pressure trans-
ducer range and calibration is set in the calibration
screen.
Condenser / Remote Oil Cooler VFD:
• 4-20mA output to control one condenser / remote oil
cooler fan which is interleaved between the remain-
ing condenser / remote oil cooler steps for smoother
control.
Slide Valve Position:
• Reads the 0-5 volt signal back from the slide posi-
tion motor actuator to indicate current slide valve
position.
% Slide Valve Position:
Volume Position:
• 4-20mA signal that transmits the slide valve position
for remote monitoring.
• Reads the 0-5 volt signal back from the slide volume
motor actuator to indicate current volume position.
Motorized Valve (V+):
Suction Temperature:
• For a cool compression compressor, this 4-20mA
signal controls a motorized valve to regulate the liq-
uid refrigerant level in the oil separator. For a liquid
injection application on a standard single screw, this
4-20mA signal controls a motorized valve to regulate
the liquid refrigerant injected into the compressor for
oil cooling purposes.
• Default signal is RTD. Suction temperature calibra-
tion is set in the calibration screen.
Discharge Temperature:
• Default signal is RTD. Discharge temperature calibra-
tion is set in the calibration screen.
Oil Separator Temperature:
Auxiliary Outputs #1 - #4:
• Default signal is RTD. Oil separator temperature cali-
bration is set in the calibration screen.
• Optional outputs that can be configured in user de-
fined manner.
Oil Manifold Temperature:
• When Oil Flow Control option is selected from config-
uration screen, Auxiliary Output #1 which is 4-20mA
signal is used to control the opening percentage of
Danfoss valve.
• Default signal is RTD. Oil manifold temperature cali-
bration is set in the calibration screen.
Process Temperature:
• Default signal is 4-20mA. Process temperature cali-
bration and range are set in the calibration screen.
Chiller Inlet Temperature:
• Default signal is 4-20mA. Measures separator level.
Chiller Inlet Temperature calibration and range are
set in the calibration screen.
Condenser Pressure:
• Default signal is 4-20mA. Condenser pressure trans-
ducer range and calibration is set in the calibration
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
3 – 6
Section 3 • Hardware Architecture
Table 3-2. Analog Inputs (2 of 2)
Description
Board
I/O #
28
Type
9
9
9
9
9
Auxiliary #12
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
0-5V, 1-5 V, 0-10V, 4-20 mA, RTD, ICTD
29
Auxiliary #13
Auxiliary #14
Auxiliary #15
Auxiliary #16
30
31
32
Table 3-3. Analog Outputs
Description
Board
10
I/O #
Type
1
2
3
Compressor VFD
4-20 mA
4-20 mA
4-20 mA
10
Condenser / Remote Oil Cooler VFD
% Slide Valve Position
10
Motorized Valve (Cool Compression or Liquid
Injection), V+
10
4
4-20 mA
10
10
10
10
5
6
7
8
Auxiliary Output #1
Auxiliary Output #2
Auxiliary Output #3
Auxiliary Output #4
4-20 mA
4-20 mA
4-20 mA
4-20 mA
Digital & Analog I/O Boards Layout
It is important to install the boards in the proper layout.
For the correct digital and analog input/output (I/O)
board layout, see Figure 3-2. Digital I/O Board Layout.
Dipswitches
• Each board has a dipswitch which sets its communi-
cations address so that it can communicate with the
CPU board. The dipswitch settings must be correct
or the I/O will not function.
Jumpers
• Jumpers are required on the analog boards to con-
figure them for the type of sensors used. The jumper
table for the analog board shows the optional jump-
er configurations for sensors other than the default
Vilter standard. If a different sensor is to be used, the
jumpers on the analog board need to be changed. In
addition, the configuration for this sensor must be
changed in the Instrument Calibration screen. The
following illustrations show the Vilter default con-
figurations for the Vission 20/20.
Figure 3-2. Digital I/O Board Layout
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Section 3 • Hardware Architecture
Voltage LEDs:
Digital Output Boards
• Marked in the diagram below in Orange. These LEDs
indicate the correct voltage of both the 5Vdc and
24Vdc power sources.
The digital output board convert signals generated by
the Vission 20/20 program into 120Vac signals that can
be energize or signal other devices. All the signals are
digital in that the only two states available or either on
or off. See board layout, Figure 3-3. Digital Output Board
Layout.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
Address Dipswitches:
Signal LEDs:
• Marked in the diagram below in Red. These dipswitch-
es are used to assign each board its address position.
The addresses are binary and therefore the address
of a digital output board will either be address as 1
(0001) or 2 (0010).
• Marked in the diagram below in Blue. These LEDs in-
dicated when a 120Vac output is being produced.
Figure 3-3. Digital Output Board Layout
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Section 3 • Hardware Architecture
Voltage LEDs:
Digital Input Boards
• Marked in the diagram below in Orange. These LEDs
indicate the correct voltage of both the 5Vdc and
24Vdc power sources.
The digital input board convert 120Vdc signals from ex-
ternal devices to signals for the Vission 20/20 program.
All the signals are digital in that the only two states avail-
able or either on or off. See board layout, Figure 3-4.
Digital Input Board Layout.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
Signal LEDs:
Address Dipswitches:
• Marked in the diagram below in light Blue. These
LEDs indicate when a 120Vac input is detected.
• Marked in the diagram below in Red. These dip-
switches are used to assign each board its address
position. The addresses are binary and therefore the
address of a digital input board can only be addressed
as 3 (0011).
Figure 3-4. Digital Input Board Layout
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Section 3 • Hardware Architecture
Voltage LEDs:
Digital In-Out Boards
• Marked in the diagram below in Orange. These LEDs
indicate the correct voltage of both the 5Vdc and
24Vdc power sources.
The digital input - output board convert signals gener-
ated by the Vission 20/20 program into 120Vac signals
as well as detect external 120Vac inputs to signal the
Vission 20/20 program.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
All the signals are digital in that the only two states avail-
able or either on or off. See board layout, Figure 3-5.
Digital Input-Output Board Layout.
Address Dipswitches:
• Marked in the diagram below in Red. These dipswitch-
es are used to assign each board its address position.
The addresses are binary and therefore the address
of a digital output board will either be address as 4
(0100) or 5 (0101).
Signal LEDs:
• Marked in the diagram below in Blue or outputs and
light blue for inputs. These LEDs indicate when a
120Vac output is being produced or a 120Vac signal
is detected.
Figure 3-5. Digital Input-Output Board Layout
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Section 3 • Hardware Architecture
Voltage LEDs:
Analog Input Boards
• Marked in the diagram below in Orange. These LEDs
indicate the correct voltage of both the 5Vdc and
24Vdc power sources.
The analog input board convert varying DC signals into
a signal that can interpreted by the Vission 20/20 pro-
gram. The signals are considered analog because the
input DC signal can vary from the minimum value to the
maximum value. See board layout, Figure 3-6. Analog
Input Board Layout.
Communication LEDs:
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
Address Dipswitches:
Configuration Jumpers:
• Marked in the diagram below in Red. These dip-
switches are used to assign each board its address
position. The addresses are binary and therefore the
address of a digital output board will be address as 6
(0110), 7 (0111), 8 (1000) or 9 (1001).
• Marked in the diagram below in Purple. The jumpers
allow the operator to configure the signal type and
range for incoming analog signals. For the correct
jumper setting for a giving application, see Table 3-4.
Analog Input Jumper Tables.
Figure 3-6. Analog Input Board Layout
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Section 3 • Hardware Architecture
Analog Input Jumper Tables
The following tables are used to configure each channel of the analog input board signal type and range desired by the
operator, see Table 3-4. Analog Input Jumper Tables.
Table 3-4. Analog Input Jumper Tables
CHANNEL 1
SIGNAL
0-5 AMP
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
ICTD
JP-1
OUT
OUT
OUT
OUT
IN
JP-2
OUT
OUT
OUT
OUT
OUT
IN
JP-3
OUT
OUT
OUT
IN
JP-27 JP-35
Analog Input 1-A*
Analog input 1-B**
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
RTD
OUT
*Use Analog Input 1-A when 0-5 AMP secondary current transformers are installed in the motor starter.
**Use Analog Input 1-B when current transformers are installed in the motor starter.
CHANNEL 2
SIGNAL
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
ICTD
JP-4
OUT
OUT
OUT
IN
JP-5
OUT
OUT
OUT
OUT
IN
JP-6
OUT
OUT
IN
JP-28
OUT
OUT
OUT
OUT
OUT
IN
Analog Input 2
OUT
OUT
OUT
OUT
OUT
RTD
OUT
CHANNEL 3
SIGNAL
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
ICTD
JP-7
OUT
OUT
OUT
IN
JP-8
OUT
OUT
OUT
OUT
IN
JP-9
OUT
OUT
IN
JP-29
OUT
OUT
OUT
OUT
OUT
IN
Analog Input 3
OUT
OUT
OUT
OUT
OUT
RTD
OUT
CHANNEL 4
SIGNAL
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
ICTD
JP-10
OUT
OUT
OUT
IN
JP-11
OUT
OUT
OUT
OUT
IN
JP-12
OUT
OUT
IN
JP-30
OUT
OUT
OUT
OUT
OUT
IN
Analog Input 4
OUT
OUT
OUT
OUT
OUT
RTD
OUT
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Section 3 • Hardware Architecture
Table 3-4. Analog Input Jumper Tables (Continued)
CHANNEL 5
SIGNAL
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
ICTD
JP-13
OUT
OUT
OUT
IN
JP-14
OUT
OUT
OUT
OUT
IN
JP-15
OUT
OUT
IN
JP-31
OUT
OUT
OUT
OUT
OUT
IN
Analog Input 5
OUT
OUT
OUT
OUT
OUT
RTD
OUT
CHANNEL 6
SIGNAL
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
ICTD
JP-16
OUT
OUT
OUT
IN
JP-17
OUT
OUT
OUT
OUT
IN
JP-18
OUT
OUT
IN
JP-32
OUT
OUT
OUT
OUT
OUT
IN
Analog Input 6
OUT
OUT
OUT
OUT
OUT
RTD
OUT
CHANNEL 7
SIGNAL
JP-19
JP-20
JP-21
JP-33 JP-25
Analog Input 7
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
OUT
OUT
OUT
IN
OUT
OUT
OUT
OUT
IN
OUT
OUT
IN
OUT
OUT
OUT
OUT
OUT
IN
2
2
2
2
2
2
1
3
OUT
OUT
OUT
OUT
OUT
ICTD
OUT
OUT
OUT
OUT
RTD
OUT
OUT
OUT
ACTUATOR
POTENTIOMETER
OUT
OUT
CHANNEL 8
SIGNAL
0-5 VOLT
1-5 VOLT
0-10 VOLT
4-20 mA
JP-22
OUT
OUT
OUT
IN
JP-23
OUT
OUT
OUT
OUT
IN
JP-24
OUT
OUT
IN
JP-34 JP-26
Analog Input 8
OUT
OUT
OUT
OUT
OUT
IN
2
2
2
2
2
2
1
3
OUT
OUT
OUT
OUT
OUT
ICTD
OUT
OUT
OUT
OUT
RTD
OUT
OUT
OUT
ACTUATOR
POTENTIOMETER
OUT
OUT
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Section 3 • Hardware Architecture
Communication LEDs:
Analog Output Boards
• Marked in the diagram below in Green. These LEDs
show the active communications between the digital
output board and the Vission 20/20 CPU board.
The Analog Output board convert signals from the
Vission 20/20 program into a current ranging from 4mA
to 20mA, see Figure 3-7. Analog Output Board Layout.
Address Dipswitches:
• Marked in the diagram below in Red. These dipswitch-
es are used to assign each board its address position.
The addresses are binary and therefore the address
of a digital output board will only be addressed as 10
(1010).
Voltage LEDs:
• Marked in the diagram below in Orange. These LEDs
indicate the correct voltage of both the 5Vdc and
24Vdc power sources.
Figure 3-7. Analog Output Board Layout
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Section 4 • Main Screen
Overview
The Main Screen is the first screen encountered when
powering up the Vission 20/20 Panel, see Figure 4-1.
Main Screen. This screen is designed as the starting
point for all succeeding screens and provides as much in-
formation as possible at a glance. The Main Screen is di-
vided into four sections. Three of the sections are static;
Top Status Bar, Bottom Status Bar and Parameters Bar.
These three sections of the main screen will remain vis-
ible while navigating through other screens and provide
a constant view of critical information. The splash screen
is the only dynamic section. All navigation to any other
screens will be performed through the Main Screen.
Figure 4-1. Main Screen
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4 – 1
Section 4 • Main Screen
Information Bars will flash their information over the top
of the status bar. The operator will see the status bar
and then one or more information bars in a repetitive
sequence.
Top Status Bar
The standard view of the status bar shows three pieces
of information. From left to right , the bar shows the con-
trol method, the current run mode, and the difference
between the desired control setpoint and the actual
value of the processes control value, see Figure 4-2. Top
Status Bar.
Information Bar – blue:
• Shows various operational modes that are different
than normal running condition. An example of this
would be a load limit condition. The compressor is
not able to completely load due to some parameter
like high motor current and therefore the operator is
notified via this type of information bar.
The status bar also has an alternate function where it dis-
plays to the user any information that requires user at-
tention or intervention. It accomplishes this by changing
the status bar’s color and/or flashing a additional infor-
mation bars over the standard status bar view.
Information bar – yellow
• This typically indicates an Alarm condition. Alarm
conditions do not stop the compressor but it is meant
to alert the operator of conditions that if corrective
action is not taken, then a compressor trip can result.
Standard Bar – blue:
• Indicates a condition where the compressor motor is
not running.
Information bar – red
Standard Bar – green:
• Informs the operator that the compressor motor
was stopped due the condition listed in the informa-
tion bar. Compressor trips are designed to protect
the equipment and any personnel operating the
equipment.
• Informs the operator that the compressor motor is
currently running.
Figure 4-2. Top Status Bar
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Section 4 • Main Screen
Stop Button:
Parameter Bar
• When pressed, stops the compressor in all cases.
Remote Lock Out Button:
The main purpose of the Parameter Bar is to display
the common operational parameters that the operator
would be most concerned with. It also gives the operator
access to critical buttons such as the stop and start but-
tons, see Figure 4-3. Parameter Bar.
• When pressed, activates the remote lock out option.
This is a safety feature that prevents any external de-
vices from assuming control and starting the com-
pressor. To release the remote lock out, the operator
must press the unit start button and then the remote
button when the start dialog box appears.
Capacity Slide Indicator:
• Shows the position of the capacity slide from 0% to
100% via a horizontal blue bar. The buttons below the
indicator are used in manual capacity control. The “-”
button will decrease the capacity position and the
“+” button will increase the position.
Alarm Reset Button:
• When pressed, clears any current alarms, trips or
status messages that may be displayed on the infor-
mation bar. Note, if the condition that created the
alarm, trip or status message still exits, the message
will reappear.
Volume Slide Indicator:
• Shows the position of the volume slide from 0% to
100% via a horizontal blue bar. In some cases, in-
crease and decrease buttons will appear below the
volume indicator. The buttons only appear if the op-
erator who is logged on has sufficient privileges. If
available, the buttons work to increase and decrease
the volume slide position in the same manner as the
capacity slide.
Figure 4-3. Parameter Bar
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Section 4 • Main Screen
• The suction box shows the current suction
pressure and suction temperature.
Parameter Bar (Continued)
Unit Start Button:
• The discharge box shows the current dis-
charge pressure and discharge temperature .
• When pressed, a start dialog box will appear that
will give the operator a number of run options; Auto,
Manual, Remote, or Auto Sequencing, see Figure 4-4.
Unit Start Pop-Up Window.
• The oil box shows the pressure differential
which is calculated as oil filter out pressure mi-
nus suction pressure. Filter differential is calcu-
lated as oil filter in pressure minus oil filter out
pressure. “Inj Temp” is the temperature of the
oil at the oil injection port and “Sep Temp” is the
temperature of the oil in the separator.
Control Parameter Boxes:
• The parameter boxes provide updated data on sev-
eral key control parameters.
• The top box indicates the desired control
setpoint that is set in the Compressor Control
Screen. In the case that the Run mode is in re-
mote capacity control, this box will show the
desired capacity position.
• The motor box shows the motor current.
Figure 4-4. Unit Start Pop-Up Window
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Section 4 • Main Screen
screen to create additional users.
Log off Button:
Bottom Status Bar
The bottom status bar gives the operator easy access
to some basic functions and information. The functions
are available via the four button, see Figure 4-5. Bottom
Status Bar.
• Pressing the log off button logs off the correct user if
any are logged in.
Help Button:
• Pressing the help button takes the operator to the
help screen where the operator can access an opera-
tion and service manual and also get access to pro-
gram information.
Maintenance Button:
• Pressing the maintenance button will give the op-
erator access to the maintenance charts and sign off
tables.
Status Bars
• The information available is provide by two status
bars, one for maintenance activities and the other for
any alarms or trips that might be active. To the right
of the status bars are positions for displaying the cur-
rent user (if any are logged in), the date and time, and
the total run hours of the compressor.
User Access Button:
• This button takes the operator to another login
Figure 4-5. Bottom Status Bar
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4 – 5
Section 4 • Main Screen
Process:
Splash Screen
• When the Process control is selected as the control
mode, this box will appear and displays the process
temperature.
The splash screen is the dynamic portion of the screen
that will change as the operator navigates through
the Vission 20/20 panel screen, see Figure 4-6. Splash
Screen. The main screen shows a graphic of a Vilter com-
pressor with a number of data boxes spread across the
screen. Also on the top left are several indicators.
% Vol:
• Displays the position of the volume slide from 0% to
100% .
Anti-Recycle:
Discharge:
• Displays the anti-recycle time, if applicable.
Oil Pump:
• Displays the discharge pressure and temperature.
Oil Filter:
• The oil pump on a Vilter compressor often cycles on
and off depending on differential pressure. This in-
dicator informs the operator when the oil pump is
running.
• Displays the oil filter inlet pressure, oil filter outlet
pressure, and oil differential pressure across the oil
filter.
Suction:
Oil Heater:
• Displays the suction pressure and temperature.
Motor:
• The oil heater often cycles on and off depending on
the separator oil temperature. This indicator informs
the operator when the oil heater is on.
• Displays the motor current. When the motor VFD is
enabled, this box will also display the motor RPM.
Remote Lock Out:
Separator:
• Displays the current status of the remote lock out.
While on, no system controller can remotely as-
sume control of the Vission 20/20 panel and start the
compressor.
• Displays the temperature of the oil in the separator.
% Cap:
• Displays the position of the capacity slide from 0% to
100%.
Menu Button:
• When pressed, navigates the operator to the menu
screen.
Figure 4-6. Splash Screen
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Section 5 • Menu Screen
Compressor Scheduling:
Overview
• Navigates to the compressor scheduling screen
where the operator can set the scheduler to change
the control method at settable dates and times.
The menu screen is the launching point to every other
section of the Vission 20/20 panel software. Every
screen navigated to from this screen will return to the
menu screen upon exiting, see Figure 5-1. Menu Screen.
Compressor Sequencing:
• Navigates to the compressor sequencing screen
where the operator can set-up compressor to se-
quence up to four other compressors. This is also
sometimes known as lead-lag control.
Navigation Buttons
Condenser Control:
Compressor Control:
• Navigates to the condenser control screen where
the operator can set up local condenser control
parameter.
• Navigates to the compressor control screen where
the operator can set the various compressor control
parameters.
Vilter VFD:
Alarms and Trips:
• Not currently available.
Service Options:
• Navigates to the alarms and trips screen where the op-
erator can set the various alarm and trip parameters.
Timers:
• Navigates to the service options screen where the
operator can manually turn on/off digital and analog
outputs for maintenance and diagnostics purposes.
• Navigates to the timer screen where the operator can
set the various time related parameters.
Figure 5-1. Menu Screen
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5 – 1
Section 5 • Menu Screen
Auxiliary I/O
Instrument Calibration:
• Navigates to the auxiliary I/O screen where an op-
erator can configure any auxiliary instruments or
devices.
• Navigates to the instrument calibration screen where
the operator can calibrate all of the system sensors.
Slide Calibration:
Configuration:
• Navigates to the slide calibration screen where the
operator can calibrate the capacity and volume slide
actuators.
• Navigates to configuration screens where the initial
system parameters are configured.
Data Backup:
Trend Chart:
• Allows the operator to backup setpoints, configura-
tion parameters, and calibration settings to a USB
memory device. In addition, this allows the restora-
tion of previously saved database files.
• Navigates to the trend chart screen where the opera-
tor can select up to four parameters for graphical his-
torical data trending.
Event List:
Main:
• Navigates to the event list screen where the operator
can view the systems events such as trips or alarms in
descending chronological order.
• Navigates back to the main screen.
Remote Oil Cooler:
• Navigates to the Remote Oil Cooler screen where the
operator can set up local Remote Oil Cooler control
parameter. Menu screen will show this option in place
of condenser control option when enabled, see Figure
5-2. Menu Screen with Remote Oil Cooler Enabled.
Input/Output States:
• Allows viewing of the live data of all analog and digi-
tal input and outputs. Also allows viewing of a “snap
shot” of all analog and digital input and outputs at
the time of the last compressor fault event.
Figure 5-2. Menu Screen with Remote Oil Cooler Enabled
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5 – 2
Section 6 • Compressor Control
Overview
Suction Pressure Control and Process
Temperature Control
The compressor control screen is where an operator
can set the majority of the compressor settings. These
setting define how the compressor will operate and re-
spond to changing loads. The compressor control screen
consists of several screens but in order not to overwhelm
the operator with options, many of the screens may not
be visible.
The Vission 20/20 uses a pulse proportional control
method to control the compressor capacity slide valve
in order to maintain the control setpoint. The control
setpoint can either be process temperature control set-
point or suction pressure control setpoint depending
on what the operator has selected as the control mode.
For screens, see Figure 6-1. Compressor Control Screen
- Suction Pressure Control and Figure 6-2. Compressor
Control Screen - Process Temperature Control.
NOTE
How the compressor is configured in the
configuration screen (Section 19) will determine
what compressor control pages are displayed.
The proportion control uses the Interval Time Setpoint
to define the time the algorithm waits to read the cur-
rent setpoint and calculates the error from the process
control setpoint. Based on the error from setpoint, the
algorithm calculates a pulse time in which the capacity
slide is moved in the direction of the error. The further
away the process variable is from the control setpoint,
the larger the corrective pulse will be. The duration of
the pulse is limited by the Pulse Time Setpoint. By default
It is important to note that there isn’t one correct way to
set these parameters. Every application is different and
requires the operator to tune these settings to achieve
the best operation.
Figure 6-1. Compressor Control Screen - Suction Pressure Control
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6 – 1
Section 6 • Compressor Control
the maximum pulse time is the same as the interval
time. This means that the pulse time can be 100% of the
interval time given a near continuous movement of the
capacity slide. Adjusting these setpoints can be useful
in slowing down the reaction time of the compressor if
large thermal time contents are present in the refrigera-
tion cycle.As mentioned in the above paragraph, the dis-
tance of the process variable from the control setpoint
determines the size of the pulse used to move the capac-
ity slide. This is called the proportional band and is set by
the Proportional Setpoint. When the process variable is
outside the proportional band, the slide will move in the
direction of the error continuously. Increasing the size
of the proportional band can help slow the compres-
sors reaction by varying loads if desired, see Figure 6-3.
Proportional Band & Setpoint.
dead band +/- 0.4 Psig of the control setpoint. Once the
process variable is within the dead band, the algorithm
considers the compressor to be on setpoint. If the op-
erator wishes the compressor to operate closer, the set-
point can be set to a smaller percentage. However this
will result in the capacity slide excessively moving to
maintain the setpoint and could over heat the actuator
or shorten the actuators operational life.
Auto-Cycle
The auto-cycle setpoints define the control points in
which the compressor will automatically cycle on and off
when the compressor has been placed into “Auto” run
mode. These setpoints can be “enabled” or “disabled”
using the check box. A delay can be entered to momen-
tarily delay the start or stop from immediately occurring
when the setpoint is met. If a compressor shutdown is
desired on a suction pressure drop and a manual reset
is required, set the OFF value below the Low Suction
The Dead Band Setpoint defines area around the control
setpoint where the algorithm stops adjusting the capac-
ity slide. This area is a percentage of the proportional
band. By default the proportional band is set to 4 Psig
and the dead band is set to 10% of 4 Psig. Making the
Figure 6-2. Compressor Control Screen - Process Temperature Control
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6 – 2
Section 6 • Compressor Control
Pressure safety trip value. This will shut down the com-
pressor and a Reset will be required to restart it.
• Enables the Auto-cycle control. Uncheck the box to
disable the Auto-cycle set-points.
The auto-cycle function will operate only in local “Auto”
mode and Direct I/O “Remote Auto” mode. If the au-
to-cycle feature is enabled while running in any other
remote mode, the function will simply be ignored.
However, the Minimum slide position will continue to
be respected in Remote “Auto” mode. If the compres-
sor changes from a remote mode back to Local “Auto”
mode, the auto-cycle feature will operate normally.
Start Pressure:
• When the suction pressure meets or exceeds this set-
point, the compressor will start.
Start Delay:
• Delays the compressor from starting when the suc-
tion pressure meets or exceeds this setpoint.
Stop Pressure:
NOTE
• When the suction pressure meets or falls below this
setpoint, the compressor will stop.
When the Pump-down Feature is enabled, the Auto-
cycle setpoints are automatically disabled. Pump-
down mode will cause the compressor to cycle off
via the Pump-down Stop Pressure setpoint, and will
not allow the compressor to start again.
Stop Delay:
• Delays the compressor from stopping when the suc-
tion pressure meets or exceeds this setpoint.
Minimum Slide Position:
Enable:
• The minimum capacity slide position that the com-
pressor is allowed to run at.
Figure 6-3. Proportional Band & Setpoint
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Section 6 • Compressor Control
see Figure 6-6. VFD Two-Step Control Method. While
loading; the compressor will first move the capacity
slide to the maximum set for step one then speed up the
motor to its maximum speed for the same step. Once
step one has completed, the control algorithm will again
move the capacity slide to the maximum position and
the maximum speed of step two. At this point the com-
pressor would be fully loaded. Unloading occurs in the
reverse direction. The two-step control method is not
typical for most installations and is normally used when
a Vilter engineer recommends it.NOTE
Variable Frequency Drive (VFD) Settings
Control
The VFD page is where the operator can tune the motor
VFD for desired operation, see Figure 6-4. Compressor
Control Screen - VFD Settings Control. A Vilter compres-
sor uses the variable speed of a VFD controlled motor to
vary the amount of work or capacity of the compressor.
The basic one step VFD control will use the capacity slide
to control the first half of the total available capacity and
the motor speed to control the second half of the total
available capacity, see Figure 6-5. VFD One-Step Control
Method. For example, if the compressor needs to load
to 100% of its capacity. The control algorithm will first
move the capacity slide to its maximum position, then
the motor speed will ramp up to its maximum speed.
In the unloading direction, the motor speed will ramp
down to its minimum speed, then the capacity slide will
move to its minimum position.
VFD installation is not covered in this manual. A VFD
that is not properly installed and configured has the
potential of causing intermittent and dangerous
problems. Please consult your VFD manual.
1 Step VFD Control:
• Enables the first step in the VFD control algorithm.
This check box is not deselectable by the operator.
The two-step control method works much like the one-
step method but divides the control into four sections,
Capacity Slide Position:
Figure 6-4. Compressor Control Screen - VFD Settings Control
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Section 6 • Compressor Control
• Defines the minimum and maximum positions for
the capacity slide. While in 1 step control these values
should be 0% for minimum and 100% for maximum.
setpoint and the process variable (SP - PV error).
This is a unit-less quantity and is used for coarse ad-
justment. This setpoint should be set to the lowest
value that gives adequate control system response.
Increasing the proportional setting increases the
control system’s sensitivity to small process fluctua-
tions and the tendency to hunt.
VFD Speed:
• Defines the minimum and maximum speed for the
motor speed. While in 1 step control these values
should reflect the full range of the VFD.
2 Step VFD Control:
I = Integral (reset) setpoint:
• Enables the second step in the VFD control algorithm.
Capacity Slide Position:
• Used to adjust the capacity control action, integrating
the error over time, to account for a small error that
has persisted for a long time. This quantity is used for
fine adjustment. This setpoint is used to smooth out
process variations. This setpoint should be set high
enough to prevent hunting but low enough to pre-
vent control system overshoot.
• Defines the minimum and maximum position of the
capacity slide in the 2 step VFD control.
VFD Speed:
• Defines the minimum and maximum speed for the
motor in the 2 step VFD control.
D = Derivative (rate) setpoint:
P = Proportional (gain) setpoint:
• Used to adjust the capacity control action, account-
ing for how fast the error is changing, positively or
negatively. A standard PID loop variable, it is not used
for our applications.
• Used to adjust the motor speed action in direct
proportion to the difference between the control
Figure 6-5. VFD One-Step Control Method
Figure 6-6. VFD Two-Step Control Method
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6 – 5
Section 6 • Compressor Control
prevented from shutting down prematurely via the
Auto-cycle Stop setpoint by automatically ignoring
the Auto-cycle feature.
Pumpdown Control
NOTE
• The compressor will be placed into “Stop” mode af-
ter the suction pressure is equal to, or goes below the
Pumpdown Stop Pressure.
For use of compressor control screen - page 4, see
Cool Compression Control in Section 25.
The Pumpdown Control defines a method of “pump-
ing” down a chiller, which is to draw off refrigerant
from the chiller. This feature can be enabled or disabled
from this page, see Figure 6-7. Compressor Control
Screen - Pumpdown/Pulldown Control. If Pumpdown is
enabled, this feature will only function when the com-
pressor is running in local Auto Mode and Control Mode
Configured is Suction Pressure.
Pumpdown:
• This checkbox enables the Pumpdown feature. If
this box is unchecked, Pumpdown setpoints are ig-
nored and the user is not allowed to edit Pumpdown
setpoints.
Stop Pressure:
• This setpoint defines the suction pressure value at
which the compressor will cycle off. Normally, this
setpoint is set below the Suction Pressure Auto-cycle
Stop Pressure setpoint.
If Pumpdown Feature is enabled, then;
• The Auto-cycle functionality is ignored. Pumpdown
mode will cause the compressor to cycle off via the
Pumpdown Stop Pressure setpoint. Normally, the
Pumpdown Stop Pressure setpoint will be set lower
than the Auto-cycle Stop setpoint. Therefore, as the
suction pressure is pulled down, the compressor is
Stop Delay:
• This setpoint delays the compressor from stopping
when the suction pressure is equal to or less than the
Figure 6-7. Compressor Control Screen - Pumpdown/Pulldown Control
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6 – 6
Section 6 • Compressor Control
Stop Pressure.
• Number of steps = delta 60 psig change * 1 step/5
psig = 12 steps.
Min Slide Position:
• Delay per Step = 48 hours / 12 steps = 4 hours/step.
• The minimum capacity slide is the setpoint that
the compressor is allowed to run at. By forcing the
compressor capacity to operate at a value above
minimum, we insure that the suction pressure will be
pulled down to the Stop Pressure setpoint.
• So for the first 4 hours, the compressor runs at 80
psig.
• Next 4 hours @ 75 psig
• Next 4 hours @ 70 psig
• And so forth.
Pumpdown Operation (Run/Stop):
• This button starts/stops the Pumpdown opera-
tion. This button is active only when compressor is
in local Auto mode and Control Mode Configured is
Suction Pressure. This button will display “Run” when
Pumpdown operation has not started or stopped,
while button will display “Stop” when Pumpdown op-
eration is running.
After the 12th step (running at 25 psig), 48 hours will
have elapsed, and the new setpoint becomes 20 psig,
achieving the 20 psig setpoint after 48 hours. After the
pulldown setpoint is equal to or is less than the control
setpoint, the pulldown feature will disable itself.
When Pumpdown feature is enabled, Pulldown check-
box is automatically grayed out. Similarly when Pulldown
feature is enabled, Pumpdown checkbox is automatically
grayed out and hence, the user will not be able to oper-
ate Pumpdown feature. This is done to keep Pumpdown
and Pulldown features mutually exclusive.
Pulldown:
• This checkbox enables the Pulldown feature. If this
box is unchecked, Pulldown setpoints are ignored
and the operator is not allowed to edit Pulldown
setpoints.
Initiate Pulldown at Next Start:
Pulldown Control
• This checkbox when enabled, turns on the Pulldown
process at the next start cycle, Pulldown operation
will work in the following manners:
The Pulldown Control defines a method of slowly pull-
ing the suction pressure down from a high value. This is
sometimes required on systems that have liquid recircu-
lation systems or on new building to prevent structural
damage by limiting the rate at which to build is cooled.
• Pulldown only works when Control mode is
Suction Pressure 1.
• If not started in Suction Pressure 1 then
Pulldown process will not run until stopped and
restarted in Suction Pressure 1.
This feature can be enabled or disabled from this page,
see Figure 6-7. Compressor Control Screen - Pumpdown/
Pulldown Control. If Pulldown is enabled, this feature will
only function when the compressor is running in local
Auto, Auto Sequencing mode and the Control mode is
Suction Pressure 1.
• If started in Suction Pressure 1 and changed
after start, then Pulldown process will be sus-
pended and restart once Control mode is
changed back to Suction Pressure 1.
The Pulldown feature provides a method to slowly pull
the suction pressure down to operating conditions. The
pulldown method used is to step the suction pressure
down over a defined time interval.
Step Pressure:
• This setpoint defines the step decrements at which
the suction pressure value will be controlled at.
Delay Per Step:
• This setpoint defines the time increment at which the
Example:
compressor will be controlled at each step.
Assume the suction pressure is at 85 psig and the set-
point we want to get to is 20 psig. The operator wants to
allow 48 hours of pulldown time. Pick a reasonable step
pressure of 5 psig for every step. This defines a change of
(80 – 20 = 60) psig.
Stop Pressure:
• This setpoint defines the suction pressure value at
which Pulldown operation will get completed. When
suction pressure value is equal to or goes below
this setpoint, Pulldown feature disables itself. Also
“Pulldown” and “Initiate Pulldown at Next Start”
checkboxes will be automatically deselected as nor-
mally this is one time use feature.
• Note: First step is applied immediately. So first step
starts at (85 – 5 = 80) psig
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Section 6 • Compressor Control
Auto Cycle Differential:
operator can also switch from setpoint 1 and setpoint 2
for each control method. What is available in this drop-
down box is dependent on the number and type of con-
trol selected in the configuration screen, see Figure 6-8.
Compress Control Screen - Misc 1 (Control Mode).
• This setpoint defines the offset pressure values for
Auto Cycle Start Pressure and Stop Pressure from the
Suction Pressure setpoint. Auto Cycle Start Pressure
setpoint will be Suction Pressure setpoint increment-
ed by this setpoint pressure value, while Auto Cycle
Stop Pressure value will be Suction Pressure setpoint
decremented by this setpoint pressure value.
Stop Load and Force Unload
When Pulldown feature is enabled, Pumpdown checkbox
is automatically grayed out. Similarly when Pumpdown
feature is enabled, Pulldown checkbox is automatically
grayed out and hence, the user will not be able to op-
erate Pulldown feature. This is done to keep Pulldown &
Pumpdown features mutually exclusive.
The stop load and force unload feature’s primary pur-
pose is to attempt to prevent the compressor from
tripping off due to particular instrument reading. For
example, if the suction pressure drops too low, the com-
pressor will trip off for safety reasons. However, the stop
load & force unload algorithm recognizes a potential trip
and either stops the compressor from loading up or even
unloads the compressor to prevent the trip.
Control Mode
This drop down box gives the operator the ability to
change the type of control mode such as suction pres-
sure control or process temperature control. The
Stop load:
• When this value is reached, the capacity slide will not
Figure 6-8. Compressor Control Screen - Misc. 1 (Control Mode)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
6 – 8
Section 6 • Compressor Control
advance in any condition.
Force Unload:
Capacity Slide Triggered Outputs
The Vission 20/20 offers two digital outputs that can
be triggered at a specified capacity slide position. By
default, the outputs are preselected for economizer
and hot gas bypass. However, these preselected out-
puts are customizable by the operator, see Figure 6-9.
Compressor Control Screen - Misc. 2 (Economizer & Hot
Gas Bypass Control).
• When this value is reached, the capacity slide posi-
tion will decrease until the variable reading is below
this value.
High Motor Amps:
• Motor current values for stop load and force unload.
High Discharge Pressure:
• Discharge pressure value for stop load and force
unload.
Slide Valve Setpoint:
Low Suction Pressure:
• Operator editable labels for the each output. Only
Economizer Port 2 Label is non-editable.
• Suction pressure values for stop load and force unload
High Discharge Superheat:
Slide %:
• Indicates the capacity slide position where the digital
output is triggered.
• Discharge temperature superheat values for stop
load and force unload. This is only used for Cool
Compression.
State Below Setpoint:
• Defines the state of the digital output when the slide
Figure 6-9. Compressor Control Screen - Misc. 2 (Economizer & Hot Gas Bypass Control)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
6 – 9
Section 6 • Compressor Control
position is below the “Slide %” setpoint. The operator
can choose between “N.O.” or “N.C.”. This setpoint
is not available for Economizer Port 2, so Economizer
Port 2 follows the setpoint of Economizer Port 1.
setpoint. This advanced feature of the Vission 20/20
closely monitors the rate of change of the process vari-
able and compares it to the control setpoint. If the pro-
cess variable is changing in the direction of the control
setpoint at the specified rate or greater, then the normal
command to move the capacity slide is interrupted. The
rate is calculated between time intervals set in the pro-
portional control section of this screen.
Active:
• Check box to enable the digital output. There is no
check box for enabling Economizer Port 2 digital
output. Economizer Port 2 digital output is enabled
when Compressor type selected from configuration
screen is “VSM7” and Economizer Port 1 digital out-
put is enabled.
Enable Load Anticipation Algorithm:
• Allows the operator to choose if the load anticipation
algorithm runs.
Rate Dead Band:
Volume Slide Position Offset
• Defines the rate at which the capacity slide move-
ment will be interrupted. This value is an absolute val-
ue of the process variable. For example, the default
value is 0.25. If the control mode is suction pressure,
then this value is 0.25 Psig or if process temperature
is the control mode then the value would be 0.25°F.
These setpoints offer the ability to alter the Volume po-
sition table to take advantage of potential energy sav-
ings. Since the volume position is a function of the ca-
pacity position, the offset to the volume is based on the
position of the capacity slide. The volume offset can be
applied to the entire capacity slide range or just a por-
tion using the Capacity Range minimum and maximum
setpoints.
Volume Slide Adjustment %:
• The value in percentage of the volume slide offset.
Capacity Range:
• Defines the range that the volume position slide off-
set will be applied.
Soft Load
This setpoint is used to slow the loading of the compres-
sor. In some refrigeration systems, a loading compres-
sor can have dramatic effects on the system parameters.
This setpoint allows an operator to reduce the continu-
ous load pulse as defined in the proportional control sec-
tion to a percent duty cycle.
Soft load %:
• Defines the duty cycle of the continuous load pulse.
At 100%, the continuous pulse will truly be continu-
ous. At 50%, the continuous pulse would be reduced
to half time on and half time off in the time interval
defined in the proportional control section.
Load Anticipating
The purpose of the load anticipating algorithm is to re-
duce the amount of overshoot of the capacity slide posi-
tion while the compressor attempts to meet the control
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6 – 10
Section 6 • Compressor Control
Oil Control
Liquid Injection
These setpoints determine how the Vission 20/20 will
manage the oil of the compressor, see Figure 6-10.
Compressor Control Screen - Oil Control & Liquid
Injection Control.
The setpoints is this section are to control the behavior
of the liquid refrigerant injected into the compressor for
oil cooling purposes. The liquid injection solenoid con-
trol is based off of discharge temperature whether the
compressor uses just an injection solenoid or a motor-
ized valve in conjunction with the solenoid.
Oil Pump Press Restart Ratio:
Liquid Injection Solenoid Control ONLY
• The on and off setpoints define when the oil pump
will cycle on and off if the oil pump is selected to cycle
from the configuration screen.
• When using only the liquid injection solenoid, the so-
lenoid is activated once the value of discharge tem-
perature meets or exceeds the value of “Liquid inj.
Setpoint 1” and the value of oil separator tempera-
ture meets or exceeds the value of “Oil Sep. Temp.
Override”. The injection solenoid will deactivate if
either of setpoints are not met. This will prevent situ-
ations where the discharge temperature may rise
quickly, but the oil temperature is still very cold. By
preventing the liquid injection solenoid from turning
on at this point, the oil separator will not be subjected
to additional liquid refrigerant, that would cool the oil
Oil Separator Heater Temp:
• When the oil temperature falls below this setpoint
the oil heater will turn on. Note, there is a 5°F differen-
tial associated with this setpoint. For example, when
set at 100°F, the heater will turn on at 95°F and off at
105°F.
Figure 6-10. Compressor Control Screen - Oil Control & Liquid Injection Control
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
6 – 11
even further.
Oil Sep. Temp. Override:
Liquid Injection Control using a 4-20ma motorized valve.
• Defines the temperature the oil must reach before the
liquid injection solenoid is allowed to be activated.
• When a motorized valve is used to control the amount
of liquid being injected into the compressor the pre-
viously mentioned setpoints have a slightly different
function. The Oil Sep. Temp. Override is still used in
controlling the injection solenoid, however the Liquid
Inj. Setpoint 1 is now used as the target temperature
for the PID Algorithm that controls the position of
the motorized valve. The algorithm compares the
actual discharge temperature against the Liquid Inj.
Setpoint 1. The difference between these is the error.
The PID algorithm tries to drive the error to “zero” by
moving the positioning valve to allow more or less
liquid refrigerant to be injected into the compressor.
P = Proportional (Gain):
• Used to adjust the positioning valve in direct propor-
tion to the difference between the control setpoint
and the discharge temperature (SetPt - DT = error).
The proportional term is a unit-less quantity and is
used for coarse adjustment. This setpoint should be
set to the lowest value that gives adequate response
to the control system. Increasing the proportional
setting increases the control system’s sensitivity to
small discharge temperature fluctuations and the
tendency to hunt.
I = Integral (reset):
• PID algorithm can be notoriously hard to tune. As
a result the Vission 20/20 offers a couple of addi-
tional features to help control wild fluctuations in
oil temperatures that could result in the compres-
sor tripping off. The operator can choose to enable
the minimum value position that automatically sets
the liquid injection motorized value to the specified
value whenever the discharge temperature has fallen
below the Liquid inj. Setpoint 1. This feature nearly
eliminates the overshoot of the PID in the downward
direction and reduces the chance of the compressor
tripping off due to low oil temperature. The operator
can also choose to use an average of the discharge
temperature and the oil manifold temperature as the
control variable. The discharge temperature can vary
quite drastically forcing the PID algorithm to drasti-
cally adjust the motorized value. By averaging the
more stable oil manifold temperature and discharge
temperature, the control variable stabilizes and the
PID is more easily tuned.
• This parameter integrates the error over time, to ac-
count for a small error that has persisted for a long
time. This quantity is used for fine adjustment. This
setpoint is used to smooth out discharge tempera-
ture variations. This setpoint should be set high
enough to prevent hunting but not too high or it will
cause control system overshoot.
D = Derivative (rate):
• This parameter accounts for how fast the error is
changing, positively or negatively.
Minimum Valve Open %:
• When enabled, this is the valve position used when-
ever the control variable drops below Liquid inj.
Setpoint 1. Use only if the compressor is tripping off
for low oil temperature due to large overshoots and
all other tuning methods have failed.
Avg. with Oil Manifold Temperature:
• When enabled, averages the Oil manifold tempera-
ture and the discharge temperature. This creates
a more stable control variable and should result in
more stable control.
• Please note that as stated above, PID algorithms can
be difficult to tune and there is no one set of PID val-
ues that will work. The work required for a compres-
sor to meet the requirement of its installation vary
greatly and therefore the amount of heat transfered
to the oil varies just as greatly. We recommend the
operator consult PID tuning guides available from
many different source before attempting to tune this
PID.
Liquid Inj. Setpoint 1:
• Setpoint at which the liquid solenoid will activate if in
solenoid control or if the setting for the control vari-
able for the PID is in liquid motorized value control.
Liquid Inj. Setpoint 2:
• Not yet available
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6 – 12
Section 7 • Alarms and Trips
side tabs in the input/output screens and are very useful
as a troubleshooting tool for the operator.
Overview
The Alarms and Trips screen allows the operator to view
and adjust settings for compressor safety and alarm set-
tings. For Alarms and Trips Screen Pages refer to Figures
7-1, 7-2, 7-3 and 7-4.
The Vission 20/20 uses Warnings as a way to notify the
operator of parameters that may inhibit the compressor
when started. Warnings are monitored only when com-
pressor is not running. Warnings are always displayed
as a orange banner on bottom status bar. Warnings
uses the alarm setpoint for detection and message. All
warnings messages present can be seen collectively in a
pop-up window. This pop-up is displayed when warning
condition is present and bottom status bar used for dis-
playing warnings is pressed.
Vission 20/20 uses Alarms as a way to notify the opera-
tor of running parameters that if left unchecked could
result in the compressor shutting down due to a trip.
Trips are the conditions that exceed the safety limits of
the compressor or refrigeration system and stops the
compressor. Trips are always displayed as a red banner
and alarms are yellow banners on the top and bottoms
status bars.
Alarms and Trips Setpoints
Alarms and trip conditions are also logged to provide
an operational history for the operator. Both alarms
and trips will be logged in the event list accessible from
the menu screen. Trips also trigger the input/output
screen to take a snapshot of all input and output values
as freeze screen. The freeze screens are available as left
Use Figure 7-1. Alarms and Trips Screen - Page 1.
Low Suction Pressure (Alarm & Trip):
• This is the low suction pressure safety. This safety
is active in both temperature and pressure control
Figure 7-1. Alarms and Trips Screen - Page 1
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7 – 1
Section 7 • Alarms and Trips
modes. An alarm or trip will be activated if the suc-
tion pressure falls below the setpoint values.
Use Figure 7-2. Alarms and Trips Screen - Page 2.
Low Suction Temperature (Alarm & Trip):
High Discharge Pressure (Alarm & Trip):
• This is the low suction temperature safety. The alarm
or trip will be activated if the suction temperature
drops below the setpoint value.
• This is the high discharge pressure safety. The alarm
or trip will be activated if the discharge pressure rises
above the setpoint value.
High Discharge Temperature (Alarm & Trip):
High Process Temperature (Alarm only)
• This is the high discharge temperature safety. The
alarm or trip will be activated if the discharge tem-
perature rises above the setpoint value.
• This alarm is active when the process temperature
is at or above the setpoint value. There is no trip
setpoint.
Low Oil Separator Start Temperature (Alarm & Trip):
Low Process Temperature (Alarm & Trip):
• This is the starting low oil separator temperature
safety. The compressor is prevented from starting
or running if the oil in the separator is below the
alarm value. After a time delay (setting of the Oil
Separator Temperature Safety Changeover timer),
this safety is deactivated and the Low Oil Separator
Run Temperature alarm and safety setpoints become
active.
• This is the low control temperature safety. This safety
is active when process temperature control has been
selected in the Control Mode dropdown selection
found in the Compressor Control screen. An alarm or
trip will be activated on a drop in process tempera-
ture below the setpoint value.
Low Oil Separator Run Temperature (Alarm & Trip):
• This is the running low oil separator temperature
Figure 7-2. Alarms and Trips Screen - Page 1 as Level 2 User
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
7 – 2
Section 7 • Alarms and Trips
safety. After a time delay, (setting of the Oil Separator
Temperature Safety Changeover timer), the Low Oil
Separator Start Temperature is bypassed and Low
Oil Separator Run Temperature alarm and safety set-
points become active. The alarm or trip will be acti-
vated if the oil temperature in the separator drops
below the setpoint value.
monitor is enabled in the configuration screen. The
compressor is prevented from starting or running if
the superheat is above the setpoint value. The warn-
ing or trip will be activated if the superheat tem-
perature rises above the setpoint value. There is no
ALARM setpoint.
High Superheat Run Temperature (Alarm & Trip):
Low Oil Injection Temperature (Alarm & Trip):
• This is the running high discharge superheat tem-
perature safety. This safety is active when super-
heat monitor is enabled in the configuration screen.
After a time delay, (setting of the High Superheat
Temperature Safety Changeover timer), the High
Superheat Start Offset Temperature is bypassed and
High Superheat Run Temperature alarm and safety
setpoints become active. The alarm or trip will be ac-
tivated if the superheat temperature rises above the
setpoint value.
• This is the low oil injection safety. The alarm and
trip setpoints are bypassed at start for a time pe-
riod (setting of the Oil Injection Temperature Safety
Changeover timer). The alarm and trip will be acti-
vated after the time delay has expired.
High Oil Injection Temperature (Alarm & Trip):
• This is the high oil injection temperature safety. The
alarm or trip will be activated if the oil injection tem-
perature rises above the setpoint value.
High Superheat Start Offset Temperature (Trip Only):
High Superheat Start Temperature (Trip Only):
• This is the starting high discharge superheat tem-
perature safety. This safety is active when super-
heat monitor is enabled in the configuration screen.
• This is the starting high discharge superheat tem-
perature safety. This safety is active when superheat
Figure 7-2. Alarms and Trips Screen - Page 2
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Section 7 • Alarms and Trips
After a time delay, (setting of the High Superheat
Temperature Safety Changeover timer), this safety is
deactivatedandtheHighSuperheatRunTemperature
alarm and safety setpoints become active. The trip
will be activated if the superheat temperature from
start rises above the superheat temperature plus the
setpoint value. There is no ALARM setpoint.
zeroed prelube oil pressure difference value is shown
on main screen during start sequence. The prelube
oil pressure is redefined as manifold pressure minus
suction pressure after the start sequence. This safety
insures adequate lubrication of the compressor at
startup.
Low (Run) Oil Pressure (Alarm & Trip):
• This is the running oil pressure safety. The normal
alarm and trip setpoints of this safety are “messaged”
as soon as the compressor starts. The “Pre lube Oil
Pressure” Alarm and Trip setpoints are substituted
into this safety setpoints for a time of the “Oil Pressure
Bypass” timer (typically 60 seconds). After this timer
expires, then the setpoints return back to the normal
settings. The action of adjusting the setpoints for
about a minute allows the (Run) Oil Pressure to build
up to normal running pressures after the compressor
starts. After the Oil Pressure Bypass Timer has ex-
pired, the Oil Pressure must be above the normal set-
points, or else an Alarm or Trip will occur. An alarm or
trip will be active if the oil pressure drops below the
Use Figure 7-3. Alarms and Trips Screen - Page 3.
Prelube Oil Pressure (Alarm & Trip):
• This is the prelube oil pump failure safety. If prelube
oil pressure does not rise by prelube alarm setting
configured with in prelube oil pressure trials of pre-
lube oil pressure monitor time for a minimum time
set at Minimum Comp. Prelube Time, then the start
sequence will be aborted. The prelube oil pressure
trials, prelube oil pressure monitor time, Minimum
Comp. Prelube Time is set on the Timer screen. The
prelube oil pressure is defined as manifold pressure
minus discharge pressure during the start sequence,
Figure 7-2. Alarms and Trips Screen - Page 3
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Section 7 • Alarms and Trips
normal setpoint values after the Oil Pressure Bypass
timer has expired. This time limit is set on the Timer
menu screen. Run oil pressure is defined as manifold
pressure minus suction pressure.
Safety Failure Messages
Low Suction Pressure Trip
• This message will appear when the suction pressure
falls below the safety setting of the Low Suction Pres-
sure Trip Setpoint No.1 or No. 2.
High Filter Differential Pressure Start (Alarm & Trip):
• This safety allows a higher than normal filter differ-
ential pressure to exist during the first minute after
a compressor starts. This allows time for cold oil that
is present in the oil piping and filters to be passed
and replaced with warmer oil. After a time delay (set-
ting of the Filter Diff Pressure Safety Changeover
timer), this safety is deactivated and the High Filter
Differential Pressure-Run alarm and safety setpoints
become active. An alarm or trip will be active if the
filter differential (= Filter Inlet Pressure minus Filter
Outlet Pressure) exceeds the setpoint value.
High Discharge Pressure Trip
• This message will appear when the discharge pres-
sure exceeds the safety setting of the Hi Dsch Press
Trip Setpoint No. 1 or No. 2.
Low Suction Temp Trip
• This message will appear when the suction tempera-
ture falls below the safety setting of the Low Suction
Temperature Trip setpoint.
High Discharge Temp Trip
High Filter Differential Pressure Run (Alarm & Trip):
• This message will appear when the discharge tem-
perature rises above the safety setting of the High
Discharge Temperature Trip setpoint.
• This safety setpoint is active when the compres-
sor has started and the Filter Diff Pressure Safety
Changeover timer has timed out. An alarm or trip will
be active if the filter differential (= Filter Inlet Pressure
minus Filter Outlet Pressure) exceeds by the setpoint
value.
Low Oil Separator Temp Trip
• This message will appear when the Oil Separator
Temp is below the Low Oil Separator Start Temp Trip
setpoint. In addition this message will appear after
the Oil Separator Temp Safety Changeover timer
times out and the Oil Separator temperature fails to
rise above the Low Oil Separator Start Temp Reset af-
ter the compressor is started.
High Motor Amps:
• This safety setpoint is active after the Volume
Decrease At Start Timer expires (this timer is not set-
table by the operator). A trip will occur if the motor
amperage exceeds the safety setpoint value. For a
motor with a 1.15 Service Factor, the trip setpoint
should be set at 125% of the motor full load amper-
age value. The alarm setpoint should be set at 120%
of the motor full load amperage value.
Low Oil Separator Temp Trip
• This message will appear when the Oil Separator
Temp is below the Low Oil Separator Run Temp
Reset setpoint after the Oil Separator Temp Safety
Changeover timer times out.
Low Run Pressure Ratio (Alarm & Trip):
• This is the low run pressure ratio safety. This safety is
active when Cool Compression is enabled in the con-
figuration screen. An alarm or trip will be active if the
pressure ratio drops below the setpoint values after
the Low Pressure Ratio Bypass timer has expired.
Low Process Temp Trip
• This message will appear when the Process Control
Temperature falls below the safety setting of the Lo
Control Temperature Trip Setpoint.
Prelube Oil Pump Inhibit
• This message will appear when the Prelube Oil
Pressure (Manifold minus Discharge) has remained
below the Prelube Oil Pressure Reset setpoint. The
oil pump will try to generate “prelube pressure” for
the time period of the Low Oil Pressure Safety Bypass
timer setting.
Compressor Inhibits
The Vission 20/20 uses several start inhibits to prevent
the compressor from starting to protect the compres-
sor and the refrigeration system. While starting the
compressor, the inhibits are checked first before the oil
pump is started or the motor is started. The failed starts
due to an inhibit does not count toward any of the anti-
recycle timers including hot starts. The Inhibits uses the
alarm setpoint to trigger an aborted start and message.
Low Oil Pressure Trip
• This message will appear when the Running Oil
Pressure (Manifold minus Suction) has remained be-
low the low Oil Pressure Reset setpoint when the Oil
Pressure Bypass Start timer times out. This message
will also appear when the Running Oil Pressure falls
below the Low Oil Pressure trip setpoint after the Low
All inhibits will be logged in the event list.
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Section 7 • Alarms and Trips
Oil Pressure Safety Bypass timer times out.
Low Oil Injection Temp Trip
Compressor Warnings
High Level Shutdown Warning
• This message will appear when High Level Shutdown
switch is Active Low.
• This message will appear when the Oil Injection tem-
peraturefallsbelowtheLowOilInjectionTemperature
trip setpoint. This message will also appear when the
Oil Injection temperature fails to rise above the Low
Oil Injection Temperature reset setpoint after the
Low Oil Injection Temp Bypass timer times out.
Low Process Temp Warning
• This message will appear when Process Control
Temperature falls below the safety setting of the
Low Process Temperature Alarm setpoint.
High Oil Injection Temp Trip
High Discharge Pressure Warning
• This message will appear when the Oil Injection
temperature rises above the High Oil Injection
Temperature trip setpoint.
• This message will appear when the Discharge
Pressure exceeds the safety setting of the High
Discharge Pressure Alarm setpoint.
High Filter Differential Trip
High Discharge Temp Warning
• This message will appear if the Filter Differential
Pressure rises above the High Fltr Diff Press – Start
setpoint before the Filter Differential Pressure Safety
Changeover timer times out.
• This message will appear when the Discharge
Temperature exceeds the safety setting of the High
Discharge Temperature Alarm setpoint.
Low Suction Pressure Warning
High Filter Differential Trip
• This message will appear when Suction Pressure falls
below the safety setting of Low Suction Pressure
Alarm setpoint.
• This message will appear if the Filter Differential
pressure rises above the High Fltr Diff Press Run
setpoint after the Filter Differential Pressure Safety
Changeover timer times out.
Low Suction Temp Warning
• This message will appear when Suction Temperature
falls below the safety setting of Low Suction
Temperature Alarm setpoint.
High Motor Current Trip
• This message will appear if the motor amperage rises
above the Hi Motor Amps trip setpoint.
Low Oil Separator Start Temp Warning
Compressor Interlock Trip
• This message will appear when the Oil Separator
Temperature falls below the safety setting of the Low
Oil Separator Start Temp Alarm setpoint.
• This message will appear if the Motor Auxiliary con-
tact fails to close before the Compressor Starter
Auxiliary Contact Bypass timer times out. Refer to
wiring diagram.
High Oil Injection Temp Warning
• This message will appear when the Oil Injection
Temperature exceeds the safety setting of the High
Oil Injection Temp Alarm setpoint.
High Level Shutdown Trip
• This message will appear when power is removed
from the input module that is designated as “Auxiliary
#1 Safety” Refer to wiring diagram.
High Filter Differential Warning
• This message will appear when the Filter Differential
Pressure exceeds the safety setting of the High Filter
Diff Start Pressure Alarm setpoint.
False Start
• This message appears when the compressor stops
and the motor auxiliary contact fails to open. The
message will also appear if the compressor shuts
down and the amperage is 20% of the maximum amp
setting, indicating that the starter is still energized.
High Superheat Temp Warning
• This message will appear when the Discharge
Superheat Temperature exceeds the safety setting of
the High Superheat Start Temp Trip setpoint.
Low Oil Level Trip
Analog Aux in 1-16 Warning
• This message appears when power is removed from
the designated input module, refer to wiring dia-
gram. This safety will activate only after the oil level
has been low for the time period defined by the “Low
Oil Separator Safety Trip Delay” timer.
• This message will appear when the Analog Aux in
1-16 exceeds / falls below the safety setting of the
High / Low Alarm setpoint.
Digital Aux in 1-16 Warning
• This message will appear when the Digital Aux in 1-8
is Active High / Low.
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7 – 6
Section 8 • Timers
amount of time.
Timers:
Overview
The timers screen allows the operator to view and adjust
timer settings associated with compressor operation.
There are different types of timers that the operator
should be aware of listed below. For Timer Screen Pages,
see Figures 8-1 and 8-2.
• A general timer requiring the time to expire before
the listed event can occur.
Timer Setpoints
Use Figure 8-1. Timers Screen - Page 1.
Capacity Increase Start Delay:
Changeover:
• At compressor startup, the capacity slide position is
held at minimum position for this time period. This is
to allow compressor and system conditions to stabi-
lize. After the timer expires, the slide is free to move
in accordance to the system demands.
• The changeover timers will change from one type
control to another once the compressor has started
and then the timer has expired.
Bypass:
Minimum Compressor Pre-lube Time:
•
The bypass timers prevent certain alarm and trip
checks from occurring until the compressor has
started and then the time has expired.
• This is the length of time the oil pump will run, after
establishing Pre-lube Oil Pressure, to prime the oil cir-
cuit before starting the compressor.
Delays:
• Delays require the condition to occur for the specified
Figure 8-1. Timers Screen - Page 1
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Section 8 • Timers
Low Oil Pressure Safety Bypass:
Low Oil Separator Temperature Safety Changeover:
• This is the length of time in which the normal Low
(Run) Oil Pressure setpoints will be adjusted by the
values of the Pre-lube Oil Pressure setpoints. After
the timer has expired, the normal Low Oil Pressure
setpoints become active.
• This timer allows Low Oil Separator Start Temperature
safety setpoint to protect the compressor against
cold oil during starting. After the timer has expired,
the Low Oil Separator Run Temperature is then active.
Low Oil Injection Safety Bypass:
Prelube Oil Pressure Monitor Time:
• This timer bypasses the Low Oil Injection Temperature
Safety setpoint during start-up, to allow any cold oil in
the oil lines and filter to pass. After the timer expires,
the Low Oil Injection Temperature safety is active.
• The Prelube Oil Pressure Monitor time defines timer
to monitor raise in prelube oil pressure against pre-
lube oil pressure alarm settings. If prelube oil pres-
sure is unable to raise by oil pressure alarm settings
in Prelube oil pressure monitor time then it restarts
oil pump.
Use Figure 8-2. Timers Screen - Page 2.
Max Restart After Power Failure:
Prelube Oil Pressure Monitor Trials:
• This timer forces the compressor to wait for the set
time period after a power failure and the panels re-
starts before it can be started automatically. By stag-
gering the time settings of this timer between other
compressor panels, the compressors can be allowed
to start automatically, one at a time, after a power
failure. This will prevent excessive load demand on
the power system that could occur if all of the com-
pressor equipment were to start at the same time.
The Power-up Auto Re-Start [x]Enable option must
be selected on the Configuration screen for this op-
tion to be active.
• The Prelube oil pressure monitor trials defines
maximum number of retries to monitor prelube oil
pressure.
Prelube Oil Pressure Safety Changeover:
• After compressor starts, drop in prelube oil pressure
is monitored for prelube oil pressure safety change-
over time. If prelube oil pressure drops with in pre-
lube oil pressure safety changeover time then com-
pressor trips on prelube oil pressure trip.
High Filter Differential Pressure Safety Changeover:
• This timer bypasses the High Filter Differential Run
Pressure safety settings when the compressor starts.
It defines how long the High Filter Differential Start
Pressure setpoints will be active after the compres-
sor starts. After the timer has expired, then the High
Filter Differential Run Pressure safety setpoints will be
active.
Hot Starts per Hour:
• This counter counts compressor starts. After every
start, a one-hour timer is reset and starts timing. If
the timer times out, the hot starts counter is reset.
When the counter reaches its preset value, it will not
allow another compressor start until the one-hour
timer times out and resets the counter. The hot starts
counter, therefore, will be reset when the time be-
tween compressor starts total one hour. This coun-
ter allows repetitive compressor starts, but once the
counter has reached its set point, it requires a one-
hour window between compressor starts in order for
the counter to be reset.
Oil Separator Level #1 Safety Trip Delay:
• This timer bypasses the low oil level switch for mo-
mentary drops in the oil level. This timer activates
when the low oil level switch opens, and deactivates
when the switch closes. If the switch is still open af-
ter the timer has timed out, the compressor will be
shut down and a trip message will be displayed. This
timer is available if the unit is equipped with a low oil
separator float switch (the oil level switch is standard
on all liquid injection units and optional on all others).
True Anti-Recycle Timer:
• Once the compressor turns off, this timer will keep
the compressor off for the setting of the True Anti-
Recycle Timer. This timer is used to prevent short cy-
cling of the compressor.
Oil Separator Level #2 Safety Trip Delay:
• This timer bypasses the low oil level switch for mo-
mentary drops in the oil level. This timer activates
when the low oil level switch opens, and deactivates
when the switch closes. If the switch is still open af-
ter the timer has timed out, the compressor will be
shut down and a trip message will be displayed. This
timer is available if the unit is equipped with a low oil
separator float switch (the oil level switch is standard
on all liquid injection units and optional on all others).
Accumulative Anti-Recycle Timer:
• This timer forces a specified time between compres-
sor starts. When the compressor starts, the timer
resets and starts timing and accumulates running
time. Once the compressor shuts down, it will not
be allowed to restart for the remainder of time left
on the Accumulative Anti-Recycle Timer. Unlike the
True Anti-Recycle Timer, if the compressor has run
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8 – 2
Section 8 • Timers
for a time period that exceeds the setpoint of the
Accumulative Anti-Recycle Timer, then when the
compressor shuts down, it will be allowed to restart
immediately.
Emergency Stop Timer:
• Defines the amount of time the compressor is in a
False start condition before activating the Emergency
stop. The emergency stop output can be connected
to a shunt-trip in the case of a run away compressor
to remove all power to the system.
Compressor Interlock Bypass:
• Once the Vission 20/20 has sent a command to the
compressor starter to start, a return signal is expect-
ed. This timer defines how much time to wait for that
signal before setting a trip condition.
Low Suction Pressure Safety Bypass:
• Sets the time that the compressor is allowed to run
at lower suction pressure then would usually be allow
at start-up.
High Motor Amps Safety Bypass:
• Starting motors can typically pull much more than
its rates full load amps for a short time. This timer ig-
nores that sudden inrush of current for the specified
time.
High Superheat Temp Safety Changeover:
• This timer activates at shutdown and changes the re-
start parameters if the time has not been met.
Figure 8-2. Timers Screen - Page 2
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8 – 4 / Blank
Section 9 • Compressor Scheduling
< Event 2 < Event 3 < Event 4 for all days. If events are
not in order, invalid events are marked with caution
symbol to indicate the operator to correct events and
then enable feature.
Overview
This menu allows the operator to schedule control set-
point switching during the day and week. This feature
can be enabled and disabled from the Compressor
Schedule screen. Up to four setpoint “switch” events
can be scheduled per day, see Figure 9-1. Compressor
Scheduling Screen.
Control Mode:
• These drop-down boxes allow selection of operat-
ing modes which gets switched once schedule event
time is achieved.
• The list of allowable modes depends on the number
of controllers selected in the configuration screen.
For example, if the number of Suction Pressure
Control Setpoints selected is “2” and the number
of Process Temperature Control Setpoints selected
is “1”, then Control Mode drop-down box will have
“Unscheduled”, “Suction Pressure SP1”, “Suction
Pressure SP2” and “Process Temperature SP1” as op-
tions for selection.
Scheduling Setpoint
Schedule:
• The options for selection are “Enable” & “Disable”.
The operator is allowed to configure setpoints relat-
ed to schedule events, but only when the schedule is
disabled.
• The operator can Enable Compressor Scheduling
Feature, only if Time Intervals are in order of Event 1
• If Control Mode is selected as “Unscheduled” and
Time set in an event is achieved, then control mode
will not get switched. Hence Control Mode can be set
Figure 9-1. Compressor Scheduling Screen
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9 – 1
Section 9 • Compressor Scheduling
as “Unscheduled” if operator does not want to use all
4 events per day.
Time:
• This setpoint allows selection of Hours, Minutes and
AM/PM values for an event. When time set for an
event is achieved, control mode will get changed as
selected for that event.
• The range of values allowed to set for Hours setpoint
is 0 – 12 for 12 hour format and 0 – 23 for 24 hour for-
mat. The range of values allowed to set for Minutes
setpoint is 0 – 59. AM/PM selection is active for se-
lection only when Time Format selected in configura-
tion screen is 12 hour.
When scheduling feature is enabled and No. of control-
lers for Suction Pressure Control & Process Temperature
Control are changed in configuration screen which
makes control modes selected in compressor schedul-
ing screen as invalid, then feature will get disabled auto-
matically and indication will be sent to operator to cor-
rect the setting.
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9 – 2
Section 10 • Compressor Sequencing
and goes beyond Load Rate 2 setpoint offset then se-
quencing decisions are made according to Load Rate
2 timer.
Overview
Compressor sequencing screen is where more than one
Vission 20/20 panels can be sequenced in network using
Modbus TCP. These settings define how the master com-
pressor should control sequenced Vission 20/20 panels.
This feature is enabled from the Configuration Screen,
see Section 19 for Compressor Sequencing.
Load Rate 1 offset (inner):
• Defines the inner pressure/temp setpoint offset to
monitor compressor load. If Suction pressure / pro-
cess temperature goes beyond Load Rate 1 setpoint
offset then sequencing decisions are made according
to Load Rate 1 timer.
Suction Pressure/Process Temperature Control Setpoint:
Pressure / Temperature Control Setpoints
• The target setpoints are read only values here.
These setpoints can be changed by logging on to
“Compressor Control” Screen.
Compressor Sequencing screen defines settings
those are used by master compressor for sequenc-
ing. For Pressure Control Setpoints see Figure 10-1, for
Temperature Control Setpoints see Figure 10-2.
Unload Rate 1 Offset (inner):
• Defines the inner pressure/temp setpoint to moni-
tor compressor load. If Suction Pressure/Process
Temperature Control drops below Unload Rate 1 set-
point offset then sequencing decisions are made ac-
cording to Unload Rate 1 timer.
Load Rate 2 offset (outer):
• Defines the outer pressure/temperature setpoint off-
set to monitor compressor load. If Suction pressure
/ process temperature surpasses Load Rate 1 offset
Figure 10-1. Compressor Sequencing Screen - Page 1
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10 – 1
Section 10 • Compressor Sequencing
Unload Rate 2 Offset (outer):
Load Rate 2 (Outer):
• Defines the outer Pressure/Temp setpoint offset
to monitor compressor load. If Suction Pressure/
Process Temperature drops below Unload Rate 1
offset and goes below Unload Rate 2 setpoint offset,
then sequencing decisions are made according to
Unload Rate 2 timer.
• If Suction Pressure/Process Temperature surpasses
Load Rate 1 offset and goes beyond Load Rate 2 set-
point offset then Load Rate 2 timer is used to make
periodic sequencing decisions.
Unload Rate 1 (Inner):
• If Suction Pressure/Process Temperature goes below
Unload Rate 1 setpoint offset then Unload Rate 1
timer is used to make periodic sequencing decisions.
Capacity Load/Unload Timers
Unload Rate 2 (Outer):
One of the following Capacity Load/Unload rate tim-
ers are used to make sequencing decisions periodically.
Suction Pressure/Process Temperature setpoints are
monitored to identify which one of the following timers
to be used.
• If Suction Pressure/Process Temperature surpasses
Unload Rate 1 offset and goes below Unload Rate 2
setpoint offset then Unload Rate 2 timer is used to
make periodic sequencing decisions.
Load Rate 1 (Inner):
• If Suction Pressure/Process Temperature goes be-
yond Load Rate 1 setpoint offset then Load Rate 1
timer is used to make periodic sequencing decisions.
Figure 10-2. Compressor Sequencing Screen - Page 2
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10 – 2
Section 10 • Compressor Sequencing
NOTE
Compressor Sequencing Table
Switching a compressor control to OFF when running
in auto seq mode puts respective slave compressor
into local auto mode. This feature is used to add or
remove slave compressors to sequence table when
running in auto sequence mode.
Compressor sequencing table menu allows operator to
view and adjust settings those are used for compressor
sequencing, see Figure 10-3. Compressor Sequencing
Screen - Page 3.
CFM:
• CFM column is read only. These values are updat-
ed automatically when Equipment combo box is
changed. This indicates Slave compressor capacity in
CFM.
Equipment:
• Options of this combo box are updated automatical-
ly. This contains names of all the compressors in the
network communicating with Master compressor.
Equipment name can be selected from drop-down
list. Same Equipment name should not be configured
more than once in Sequencing table.
Priority:
• This defines priorities of compressors on the network.
This priority will decide the sequence in which com-
pressors will be turned on and off during sequence
cycle. Lower the priority number greater the priority
of the compressor.
Control:
• Inclusion/exclusion of compressor partaking in the
sequencing can be decided on basis of this toggle
button. Compressors can be included/excluded by
toggling ON/OFF.
Figure 10-3. Compressor Sequencing Screen - Page 3
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10 – 3
Section 10 • Compressor Sequencing
Step:
Machine Start Time:
• This parameter would decide stepwise increment or
decrement value in percentage of the compressor
capacity. In the case when last step makes total ca-
pacity greater than maximum capacity, total capac-
ity will get reduced to maximum capacity. Same is
applicable when last step makes total capacity lower
than minimum capacity takes priority.
• Machine start timer shows the time in seconds that
the Master Compressor will hold before starting slave
compressor once (Start) decision is taken.
Machine Stop Time:
• Machine Stop timer shows the time in sec that the
Master Compressor will hold before stopping slave
compressor once (Stop ) decision is taken.
Min Cap:
• Defines the lowest capacity in percentage with which
a compressor is allowed to run. Minimum capacity
value takes preference on first step value.
Refresh:
NOTE
Max Cap:
Before Configuring Sequencing table on Master
Compressor, log on to slave compressors one by
one and enable sequencing in slave mode, put slave
in remote mode. Then log on to Master Compressor
and wait till all slaves show up their names under
equipment List.
• Defines the highest capacity in percentage with
which a compressor is allowed to run. Maximum ca-
pacity value takes preference over last step value.
Status Symbols:
• Status symbols shows status of Slave compressors on
the sequencing table, see Table 10-1. Status Symbols.
For further details, see Application Notes.
• Compressor Sequencing table is automatically re-
freshed every 1 minute. Pressing “Refresh” button
refreshes the status of the Compressor Sequencing
table on Master Compressor.
Table 10-1. Status Symbols
Symbol
Description
Slave Compressor is detected but is not configured
in the sequencing table.
Default, If slave Compressor is not present.
Slave Compressor is configured in sequencing table
but is not configured in “Remote” mode.
Slave Compressor configured in sequencing table
and is in ready to run state.
Slave Compressor is running with Alarm condition.
Slave Compressor stopped due to Error Condition.
Slave Compressor running at maximum capacity
without any error.
Slave Compressor under active control of Master
Compressor
Slave Compressor running into its stop timer, will be
stopped.
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10 – 4
Section 11 • Condenser Control
Overview
Condenser Control Setpoint:
This screen allows the operator to view and adjust con-
denser setpoint settings associated with condenser op-
eration. This screen will only be active if the Condenser
Control option has been enabled from the Configuration
Screen, see Figure 11-1. Condenser Control Screen.
Run Mode:
• Run Mode allows the selection of different modes of
operation for condenser control. The choices for se-
lection are:
Run Never
The Condenser Control operation allows the cycling of
fans and pumps in order to maintain a specific condens-
ing pressure. The five different steps in step control al-
low selection of fans, pumps and VFD in one or more
steps. When a VFD is employed, VFD is allowed to reach
maximum speed, if additional capacity is needed, the
next fan or pump is turned on. The VFD will modulate
down and then once it is back up to 100% again, then
the next fan or pump is turned on. This method allows
the smoothest condenser control by spacing the VFD
between the fan and pump steps, while maintaining a
condenser pressure that matches the setpoint.
• The mode of operation by default. Condenser Control
operation will not be performed when this mode is
active.
Run With Comp
• Automatic operation of condenser control selected
when control of the condenser is required to only run
when the compressor is running.
Run Always
• Automatic operation of condenser control selected
when control of the condenser is required to run even
when the compressor is off.
Figure 11-1. Condenser Control Screen - Page 1
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Section 11 • Condenser Control
Manual:
High to Low Speed Fan Delay:
• Mode for controlling condenser control operation
manually. Operator controls the operation by manual
stepping using an on/off toggle button at each step.
• This is a time delay for the fan spin down in case of
2- speed motor/dual speed fan.
Summer/Winter Auto Switch:
Condenser Press:
• This checkbox when enabled allows profiles to switch
automatically depending on ambient temperature
setpoint when Run Mode is “Auto”. When ambient
temperature falls below ambient temperature set-
point, winter profile is used. Similarly when ambient
temperature is above ambient temperature setpoint,
summer profile is used.
• This is the read only parameter and it displays the
present value of condenser pressure.
Condenser Setpoint:
• This is the condenser pressure setpoint that needs to
be maintained.
Upper Deadband:
Wetbulb Override:
• This is the condenser pressure setpoint upper dead-
band value. No additional condenser capacity is add-
ed when the condenser is selected for automatic step
control and the condenser pressure falls within this
deadband.
• This checkbox when enabled gives the operator a
functionality to control energy wastage. When the
condenser temperature reaches wetbulb tempera-
ture plus the operator given offset, then the con-
denser control operation does not add additional
steps. This is done as it is not possible to lower the
temperature anymore, and by adding more fans or
pumps controls the operation by manually stepping
using an on/off toggle button at each step.
Lower Deadband:
• This is the condenser pressure setpoint lower dead-
band value. Condenser capacity is not reduced
when the condenser is selected for automatic step
control and the condenser pressure falls within this
deadband.
Step Control
Ambient Temp:
• This is the read only parameter and it displays the
present value of ambient temperature. This is dis-
played only when Ambient Sensor is enabled from
Configuration Screen.
The Step Control allows the operator to setup the man-
ner in which Fans, Pumps & VFD will be turned on/off.
Fans & Pumps are connected on digital outputs Out #1
to Out #4. VFD Fan is connected on Analog Output. Each
step can have maximum of five outputs connected to it.
Each step can be opted in or out depending on enabling
of checkbox.
Wetbulb Temp:
• This is the read only parameter and it displays the
present value of wetbulb temperature. This is dis-
played only when Wetbulb Sensor is enabled from
Configuration Screen.
When Run Mode is Auto and condenser pressure rises
above upper deadband, condenser step gets incremen-
tal from Step 1 to Step 5 and hence switching on/off
Pumps, Fans & VFD connected on outputs. This holds
true for decremented of steps from Step 5 to Step 1
when condenser pressure falls below lower deadband.
Wetbulb Offset:
• This is the offset value from wetbulb temperature as
the override point.
Switch Temp:
Step Delay:
• This is the ambient temperature setpoint used for au-
tomatic switching of profile from summer to winter
and vice-versa.
• Allows operator to set time delays between condens-
er steps. Condenser Pressure must be outside upper
or lower deadband continuously for delay time in or-
der to increase or decrease condenser steps. While
in a VFD step, an additional step can only be added
once VFD has reached its maximum speed setpoint
and the delay timers are satisfied.
Profile Selection:
• Profile selection allows operator to have two different
output profiles for summer and winter. Operator can
have different selection of fans, pumps & VFD in five
steps of step control table. Different profiles allow
inclusion/exclusion of water pumps in cold weather
when summer/winter auto switch is enabled. This
selection is inactive when Run mode is Auto and
Summer/Winter Auto Switch is enabled.
• Similarly in a VFD step, a step can only be removed
once VFD has reached its minimum speed setpoint
and the delay timers are satisfied. Step Delay acts
as “ON” timer while loading and acts as “OFF” timer
while unloading for the same step.
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11 – 2
Section 11 • Condenser Control
Low Speed Fan:
percentage for Condenser VFD Fan at which it should
run for continuous step delay time to increase con-
denser steps. E.g. let’s say setpoint is kept at 95%.
Then condenser VFD fan will have to run at speed
of 95% or more to advance to next step. Maximum
Speed can be set as 100%, which is when analog out-
put (at which condenser VFD fan is connected) reach-
es to 20mA in its normal range of 4-20 mA
• Allows steps to have option for time delay in case of
fan spin down. Any of Out #1 to Out #4 can be se-
lected as Low Speed Fan through combo box. E.g.:
Let’s say Out #2 is selected as Low Speed Fan in Step
2. When step 2 becomes active during condenser
control operation which is after Step 2 time-out de-
lay, Out #2 is left off for time as set by the operator in
High to Low Speed Delay. After low speed fan ener-
gizes, then timer for Step 3 starts timing.
Minimum Speed:
• This setpoint defines the minimum speed in percent-
age for Condenser VFD Fan at which it should run for
continuous step delay time to decrease condenser
steps. E.g. let’s say setpoint is kept at 5%. Then con-
denser VFD fan will have to run at speed 5% or less to
advance to next step. Minimum Speed can be set as
0%, which is when analog output (at which condens-
er VFD fan is connected) reaches 4mA in its normal
range of 4-20 mA.
Control:
• Toggle any of the steps On/Off during Manual opera-
tion of Condenser Control. This button is active only
when Run Mode selected is Manual. During Auto op-
eration of Condenser Control, control button for ac-
tive step will be “ON”.
VFD Settings
This page is active only when Condenser VFD is selected
in the Configuration Screen, see Section 19. For VFD
controls refer to Figure 11-2. Condenser Control Screen
- Page 2. When a VFD Fan is used for condenser control
operation, the speed of the VFD is controlled using PID
algorithm.
P = Proportional (gain):
• Used to adjust the fan speed action in direct propor-
tion to the difference between the control setpoint
and the process variable (SP - PV = error). The pro-
portional term is a unit less quantity and is used for
coarse adjustment. This setpoint should be set to the
lowest value that gives adequate control system re-
sponse. Increasing the proportional setting increases
the control system’s sensitivity to small process fluc-
tuations and the tendency to hunt.
I = Integral (reset):
• Used to adjust the capacity control action, integrat-
ing the error over time, to account for a small er-
ror that has persisted for a long time. This quantity
is used for fine adjustment. This setpoint is used to
smooth out process variations. This setpoint should
be set high enough to prevent hunting but not too
high or it will cause control system overshoot.
D = Derivative (rate):
• Used to adjust the capacity control action, account-
ing for how fast the error is changing, positively or
negatively.
Maximum Speed:
• This setpoint defines the maximum speed in
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11 – 3
Section 11 • Condenser Control
Figure 11-2. Condenser Control Screen - Page 2
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11 – 4
Section 12 • Service Options
Use Figure 12-1. Service Options Screen - Digital Outputs
(Page 1)
Overview
The Service Option screen allows the operator the ability
to force individual digital or analog outputs ON. This fea-
ture is used for diagnostic purposes during initial setup
and/or if the operator suspects an issue with the out-
puts. The buttons in this screen are not available while
the compressor is running .
Compressor Start:
• Activates the output assigned to the compressor mo-
tor starter. The output is connected to terminal 11
and is the 1st LED on card 1.
Oil Pump Start:
• Activates the output assigned to the oil pump. The
output is connected to terminal 12 and is the 2nd
LED down on card 1.
Digital Outputs
Capacity Increase Motor:
The digital output buttons are momentary toggle but-
tons. The output will be active while the operator has his
finger on the button. The output will deactivate when
the operators finger is removed. The operator can mea-
sure the output at the terminal block or view the output
by watching the LEDs located on the cards. For Digital
Output screens, see Figures 12-1, 12-2, 12-3 and 12-4.
• Activates the output assigned to the increase input
of the capacity actuator. The output is connected to
terminal 13 and is the 3rd LED down on card 1.
Capacity Decrease Motor:
• Activates the output assigned to the decrease input
of the capacity actuator. The output is connected to
terminal 14 and is the 4th LED down on card 1.
Figure 12-1. Service Options Screen - Digital Outputs (Page 1)
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12 – 1
Section 12 • Service Options
Use Figure 12-2. Service Options Screen - Digital Outputs
(Page 2)
Volume Increase Motor:
• Activates the output assigned to the increase input
of the volume actuator. The output is connected to
terminal 15 and is the 5th LED down on card 1.
Slide Valve Setpoint # 1 (Economizer):
• Activates the output typically assigned to the econo-
mizer solenoid, but can be changed by the operator.
The output is connected to terminal 21 and is the 1st
LED on card 2.
Volume Decrease Motor:
• Activates the output assigned to the decrease input
of the volume actuator. The output is connected to
terminal 16 and is the 6th LED down on card 1.
Slide Valve Setpoint # 2 (Hot Gas Bypass):
• Activates the output typically assigned to the hot gas
bypass solenoid, but can be changed by the operator.
The output is connected to terminal 22 and is the 2nd
LED on card 2.
Oil Separator Heater
• Activates the output assigned to the oil separator
heater. The output is connected to terminal 17 and is
the 7th LED down on card 1.
Alarm:
Trip:
• Activates the output during an alarm condition. This
is a reverse acting output. The output is connected to
terminal 23 and is the 3rd LED on card 2.
• Deactivates the output during a trip or inhibit con-
dition. This is a reverse acting output. The output is
connected to terminal 18 and is the bottom LED on
card 1.
Economizer Port # 2 :
• Activates the output typically assigned to the econo-
mizer solenoid. The output is connected to terminal
Figure 12-2. Service Options Screen - Digital Outputs (Page 2)
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12 – 2
Section 12 • Service Options
on card 2.
24 and is the 4th LED down on card 2.
Liquid Injection # 1:
Use Figure 12-3. Service Options Screen - Digital Outputs
(Page 3) and Figure 12-4. Service Options Screen - Digital
Outputs for Remote Oil Cooler (Page 3)
• Activates the output assigned to the liquid injection
solenoid. The output is connected on terminal 25
and is the 5th LED on card 2.
Condenser / Remote Oil Cooler Step # 1:
• Activates the output assigned to the 1st step of the
Condenser / Remote Oil Cooler. The output is con-
nected to terminal 41 and is the 1st LED on card 4.
Liquid Injection # 2:
• Not currently used.
Remote Enabled:
Condenser / Remote Oil Cooler Step # 2:
• Activates the output assigned to notify a central con-
trol system of the Vission 20/20 run status. The out-
put is connected to terminal 27 and is the 7th LED on
card 2.
• Activates the output assigned to the 2nd step of the
Condenser / Remote Oil Cooler. The output is con-
nected to terminal 42 and is the 2nd LED down on
card 4.
Shunt Trip:
Condenser / Remote Oil Cooler Step # 3:
• Activates the output during a false start condition
and the emergency stop timer has expired. This out-
put could be wired the a breaker with a shunt trip that
feeds power to a starter to force a shutdown. The
output is connected to terminal 28 and is the 8th LED
• Activates the output assigned to the 3rd step of the
Condenser / Remote Oil Cooler. The output is con-
nected to terminal 43 and is the 3rd LED down on
card 4.
Figure 12-3. Service Options Screen - Digital Outputs (Page 3)
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12 – 3
Section 12 • Service Options
Condenser / Remote Oil Cooler Step # 4:
• Activates the output assigned to the 4th step of the
Condenser / Remote Oil Cooler. The output is con-
nected to terminal 44 and is the 4th LED down on
card 4.
Figure 12-4. Service Options Screen - Digital Outputs for Remote Oil Cooler (Page 3)
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12 – 4
Section 12 • Service Options
% Slide Valve Position
Analog Outputs
• Sets the analog output assigned to the Slide Value
position used to inform a central control system of
the capacity position. The output is connected to AO
#3 on card 10.
The Analog Output (AO) selections allow the operator
to enter a desired value of the output then turn on the
output, see Figure 12-5. Service Options Screen - Analog
Outputs (Page 4). The operator will have to measure
the output using meter capable of measuring a 4-20mA
signal.
Liquid injection Motorized Valve:
• Sets the analog output assigned to the liquid injec-
tion motorized value position. The output is connect-
ed to AO #4 on card 10.
Compressor VFD:
• Sets the analog output assigned to the compressor
VFD. The output is connected to AO #1 on card 10.
Condenser / Remote Oil Cooler VFD:
• Sets the analog output assigned to the Condenser /
Remote Oil Cooler VFD. The output is connected to
AO #2 on card 10.
Figure 12-5. Service Options Screen - Analog Outputs (Page 4)
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12 – 5
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12 – 6 / Blank
Section 13 • Instruments Calibration
calibrated through the Vission 20/20.
Overview
The Instrument Calibration screen allows the operator
to define how the Vission 20/20 will interpret the signal
from any devices attached to the panel’s analog inputs.
The instrument calibration screen is organized up to six
pages. Each page is then divided into several left side
selected tabs. Each tab will be headed with an informa-
tion bar labeled “I/O” that give the basic information
for that device. The “A/D bit Value” display box shows
the unmodified value read by the Vission 20/20 analog
to digital converters. This display box is not affected by
any changes to the calibrations settings. As long as a de-
vice is connected to the associated input, there will be
a value in this display box. The “Calibrated Value” dis-
play box shows the end result of the calibration process.
Therefore, any changes to the calibration setpoint will
effect what value is shown.
Pressure and Temperature Inputs
The most commonly used instruments are tempera-
ture and pressure sensors. The first two pages of the
Instrument Calibration screen are dedicated to these
instruments, see Figures 13-1 and 13-2.
Each tab on these two pages are divided into two sec-
tions, Device Calibration and Channel Calibration. The
device calibration section is where the operation param-
eters of the instrument is defined. The channel calibra-
tion defines the type of signal sent by the instrument.
Default Devices:
• By selecting this option, the operator will have access
via a drop-down box of several common devices. The
devices are predefined and if one is selected, then all
the setpoints will be set for the operator.
All instruments are calibrated using a two point linear
calibration process. Any device that has a non-linear re-
sponse to environmental stimuli will not be able to be
Figure 13-1. Instruments Calibration Screen - Analog Inputs (Page 1)
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13 – 1
Section 13 • Instruments Calibration
Custom Device:
Motor Current
• This option allows the operator to choose the mini-
mum and maximum value of the instrument being
used.
The Vission 20/20 has two options for measuring motor
current. A 4-20mA signal transmitted from an external
device or a 0-5Amp AC current Transformer. The type
of device being used is selected in the Configuration
Screen, Motor Current Device in Section 19.
Offset:
• Once the two point calibration is completed, it is not
uncommon for there to be a small error. By entering
the value of the error from the calibrated value and
the actual value into the adjustment entry box, that
error will be added/subtracted from the total offset.
The offset is applied to the calibrated value which
should correct the error.
The motor current tab has the ability to calibrate both
measurement options through the 4-20mA scale and
current transformer ratio sections, see Figure 13-3.
Instruments Calibration Screen - Analog Inputs (Page 3).
However, the device type that is selected in the configu-
ration screen will be the only section that will be avail-
able to the operator.
Range:
• This option is available when the custom device op-
tion is chosen. Here the operator defines the signal
type and range transmitted by the instrument. The
operator can choose from several predefined ranges
in the drop-down box or enter a value.
The calibration differs from all other calibration proce-
dures in that the motor current must be calibrated while
the compressor is running at close to full load amps as
possible. In addition, the operator will need to enter a val-
ue into the “Enter Desired Value” entry box that is equal
to the measured value in amps by a calibrating measure-
ment device. After entering the measured value, the
Figure 13-2. Instruments Calibration Screen - Analog Inputs (Page 2)
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13 – 2
Section 13 • Instruments Calibration
displayed motor current may still be off slightly. In this
case reenter the desired value and the displayed value
should get progressively closer.
total error offset of entries from the “Enter
Desired Value” setpoint.
Current Transformer Ratio:
• Primary
• Defines the upper value of the current
transformer.
• Secondary:
4-20mA Scale:
• 4mA:
• Not editable by the operator. Defines the
minimum value in amps represented by a 4ma
inputs.
• Not editable by the operator. Defines the
minimum value of the current transformer.
• 20mA:
• Enter Desired Value:
• Defines the maximum value in amps repre-
sented by a 20ma inputs.
• The operator enters the value of the cor-
rect current value. Each entry will recalculate
the point-slope calculations of the current
calibration.
• Enter Desired Value:
• The operator enters the correct current value.
Each entry will recalculate the point-slope calcu-
lations of the current calibration.
• Total Error:
• Not editable by the operator. Displays the to-
tal error offset of entries from the “Enter Desired
Value” setpoint
• Total Error:
• Not editable by the operator. Displays the
Figure 13-3. Instruments Calibration Screen - Analog Inputs (Page 3)
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13 – 3
Section 13 • Instruments Calibration
Remote Capacity
Analog Inputs
The remote capacity input allows a system controller
such as the PLC to control the capacity position during
direct I/O control.
This section of the Calibration screen allows the opera-
tor to define the parameters of an installed auxiliary ana-
log instrument. These instruments are usually not part
of a typical compressor setup but Vission 20/20 provides
a way for the operator to add additional capabilities. The
layout of this screen is typical to the pressure and tem-
perature calibration screens. For Analog Inputs screens,
see Figures 13-4 and 13-5.
Control Input:
• This dropdown box is not used at this time.
Scale:
• Defines the minimum and maximum Capacity posi-
Device Calibration:
tion between 0% & 100% for the 4-20ma input.
• These setpoints allow the operator to define what the
input from the auxiliary instrument means in terms
of units and range. If a temperature measuring in-
strument is connected, then the operator would se-
lect temperature from the Unit drop-down box then
set the maximum and minimum value for the scale.
Offset:
• Used to correct any error in the capacity position. By
entering a value into the Adjustment entry box, that
value will be added to the total offset displayed in the
“total offset” entry box.
Offset:
• Once the two-point calibration is completed, it is not
Figure 13-4. Instruments Calibration Screen - Analog Inputs (Page 4)
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13 – 4
Section 13 • Instruments Calibration
uncommon for there to be a small error. By entering
the value of the error from the calibrated value and
the actual value into the adjustment entry box, that
error will be added/subtracted from the total offset.
The offset is applied to the calibrated value which
should correct the error.
Range:
• Here the operator defines the signal type and range
transmitted by the instrument. The operator can
choose from several predefined ranges in the drop-
down box or enter a value.
Figure 13-5. Instruments Calibration Screen - Analog Inputs (Page 5)
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13 – 5
Section 13 • Instruments Calibration
the output will go to either 4ma or 20 ma. The opera-
tor can then measure the output for accuracy.
Analog Outputs
Min (mA):
The Analog output card of the Vission 20/20 generates
a 4 – 20mA signal to any attached devices. However,
it is not uncommon that small difference in the board
components might result in small difference in the out-
put. So this screen offers the operator the ability to fine
tune the upper and lower output values, see Figure 13-6.
Instruments Calibration Screen - Analog Outputs (Page
6).
• If the 4ma output has an unacceptable amount of
error. The operator can use the “+” & “-” buttons to
adjust the output.
Max (mA):
• If the 20ma output has an unacceptable amount of
error. The operator can use the “+” & “-” buttons to
adjust the output
Test Limits:
• By pressing either the Test Min or Test Max buttons,
Figure 13-6. Instruments Calibration Screen - Analog Outputs (Page 6)
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13 – 6
Section 14 • Slide Calibration
this section displays the value of the actuator signals in
millivolts in the “input Value” display box.
Overview
The Slide Calibration screen is used in calibrating the
slide actuators and to establish Vission 20/20 control
parameters. It is important that the operator uses cau-
tion while operating in this screen, see Figure 14-1. Slide
Calibration Screen. The normal safety checks that pre-
vent the slide from colliding with the mechanical stops
are overridden. When the calibration process is complet-
ed and the operator exits the screen, Both actuator will
return the slides back to their minimum positions.
“-” Button:
• When the operator presses and holds this button,
the output associated with capacity slide decrease
is energized. If the actuator does not turn in the cor-
rect direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
“+” Button:
• When the operator presses and holds this button,
the output associated with capacity slide increase is
energized. If the actuator does not turn in the cor-
rect direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
Capacity Slide Valve Potentiometer
This section provides critical information and control pa-
rameters related to the capacity slide actuator. The “%
cap” display shows the actual value in percent of the ca-
pacity slide with out any conditioning that might be ap-
plied to the other capacity position displays. In addition,
Software limit setpoint:
• The Vission 20/20 uses the “Min Limit” and
“Max Limit” setpoint to define an area within the
Figure 14-1. Slide Calibration Screen
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14 – 1
Section 14 • Slide Calibration
mechanical stops for normal slide travel. These soft-
ware limits purpose is to prevent the slide from actu-
ally hitting the mechanical stops which could result
in a number of undesirable consequences. By default,
the software limits are set to 150mV from either end
point. The position percentage is calculated from the
software limits. Therefore, it is possible to read a val-
ue greater than 100% or less than 0% if inertial carries
the slides after these limits are reached.
directions from the main computer in the control panel.
The position sensor tells the main computer the position
of the slide valve. The main computer uses the position
and process information to decide where to move the
slide valve next.
During calibration, the position sensor records the high
and low count of motor turns. The operator tells the
position sensor when the actuator is at the high or low
position with the push button. Refer to the calibration
instructions for the detailed calibration procedure.
The position sensor can get “lost” if the motor is moved
while the position sensor is not powered. To prevent
this, the motor can only be moved electrically while
the position sensor is powered. When the position sen-
sor loses power, power is cut to the motor. A capaci-
tor stores enough energy to keep the position sensor
circuitry alive long enough for the motor to come to a
complete stop and then save the motor position to non-
volatile EEPROM memory. When power is restored, the
saved motor position is read from EEPROM memory and
the actuators resumes normal function This scheme is
not foolproof. If the motor is moved manually while the
power is off or the motor brake has failed, allowing the
motor to free wheel for too long after the position sen-
sor looses power, the actuator will loose its calibrated
position.
Volume Slide Valve Potentiometer
This section provided critical information and control
parameters related to the volume slide actuator. The “%
Vol” display shows the actual value in percent of the vol-
ume slide with out any conditioning that might be ap-
plied to the other volume position displays. In addition,
this section displays the value of the actuator signals in
millivolts in the “input Value” display box.
“-” Button:
• When the operator presses and holds this button,
the output associated with volume slide decreases
is energized. If the actuator does not turn in the cor-
rect direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
A brake failure can sometimes be detected by the po-
sition sensor. If the motor never stops turning after a
power loss, the position sensor detects this, knows it will
be lost, and goes immediately into calibrate mode when
power is restored.
“+” Button:
• When the operator presses and holds this button,
the output associated with volume slide increase is
energized. If the actuator does not turn in the cor-
rect direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
Slide Valve Actuator Calibration for Optical
Style Motors
Software limit setpoint:
Assuming that the actuator motors have not been cali-
brated, the transmitter output of the actuator motor
will fluctuate wildly until they are calibrated. To prevent
damage to actuator motors, do not connect the Power
Cable (Yellow TURCK cable) or the Position Transmitter
Cable (Gray TURCK cable) until instructed to do so in this
procedure.
• The Vission 20/20 uses the “Min Limit” and “Max
Limit” setpoint to define an area within the mechani-
cal stops for normal slide travel. These software limits
purpose is to prevent the slide from actually hitting
the mechanical stops which could result in a number
of undesirable consequences. By default, the soft-
ware limits are set to 150mV from either end point.
The position percentage is calculated from the soft-
ware limits. Therefore It is possible to read a value
greater than 100% or less than 0% if inertial carries
the slides after these limits are reached.
1. Open the plastic cover of the capacity motor by re-
moving the four #10 Pan Head Phillips screws. Gently lift
the cover and tilt it toward the TURCK connectors. Raise
the cover enough to be able to press the blue calibrate
button and to be able to see the red LED on the top of
the assembly, see Figure 14-2. Photochopper.
Slide Valve Operation
2. Remove actuator motor cover(s).
3. Log In on the Vission 20/20.
The slide valve actuator is a gear-motor with a position
sensor. The motor is powered in the forward and reverse
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14 – 2
Section 14 • Slide Calibration
4. From the main screen select the Menu button.
9. Quickly press and release the BLUE CALIBRATION
BUTTON on the ACTUATOR motor once. The RED LED
will stop flashing. This now instructs the ACTUATOR mo-
tor that this point is the maximum slide position. This
point corresponds to 5 volts. The ACTUATOR calibration
procedure is completed.
5. On the menu screen select the Slide Calibration but-
ton. When the “Slide Valve Calibration” screen appears,
then you can safely connect the Power Cable (Yellow
TURCK cable) and the Position Transmitter Cable (Gray
TURCK cable) to the Capacity motor. Press “+” or “-” to
move the slide valves to check the rotation. (See Table 1
below for proper shaft rotation). If for any reason the “+”
or “-” command on the panel does not correspond to the
slide increase or decrease, swap the blue & brown wires
of the Yellow TURCK cable in the control panel to reverse
the rotation of the motor.
Now the Capacity Channel is automatically calibrated
based on the calibration settings made to the actuator.
CAUTION
DO NOT CONTINUE TO ENERGIZE THE ACTUATOR
MOTOR AFTER THE SLIDE HAS REACHED THE
MECHANICAL STOP. Doing so may cause mechanical
damage to the motor or shear the motor shaft
key. When the slide has reached the mechanical
stop position, press the button in the center of the
photochopper to release the brake, and thereby
release the tension on the actuator motor.
6. Quickly press and release the BLUE CALIBRATION
BUTTON on the ACTUATOR motor once. This instructs
the ACTUATOR motor to enter the calibration mode. The
red LED on the actuator control board will begin flash-
ing. Use the “-” button on the Vission 20/20 panel to
drive the capacity slide to its minimum mechanical stop
position.
This will be apparent by a slowing of the motor rotation
and a winding sound from the actuator motor. When
you hear the motor wind-up, release the “-” button.
Figure 14-2. Photochopper
Then use the “+” button to pulse the motor so that the
capacity slide is “just off” of its minimum position and
there is no tension on the motor shaft.
CAUTION
7. Quickly press and release the BLUE CALIBRATION
BUTTON on the ACTUATOR motor once. The red LED
will now flash at a slower rate. This now instructs the
ACTUATOR motor that this point is the minimum slide
position. This point will correspond to 0 volts AFTER the
ACTUATOR calibration procedure is completed.
Do not over tigten screws. Failure to comply may
result in damage to equipment.
.
10. Gently lower the plastic cover to where it contacts
the base and O-ring seal. After making sure that the
cover is not binding, gently tighten the four # 10 Phillips
screws.
8. Use the “+” button on the Vission 20/20 to drive the
capacity slide to its maximum mechanical stop position.
This will be apparent by a slowing of the motor rotation
and a winding sound from the actuator motor. When
you hear the motor wind-up, release the “+” button.
11. Repeat the same procedure for the Volume slide
motor.
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14 – 3
Section 14 • Slide Calibration
Command Shaft Rotation
The following table describes the rotation direction required by the actuator. Every optical actuator has the ability to
be wired to rotate in either direction. Energizing the blue actuator wire results in a CCW rotation and energizing the
brown wire results in a CW rotation, see Table 14-1. Command Shaft Rotation Required By Actuator.
Table 14-1. Command Shaft Rotation Required By Actuator
Command Shaft Rotation
Capacity Volume
INC INC
Number of Turns / Rotation Angle / Slide Travel
Capacity Volume
Turns Angle Travel Turns Angle
Compressor
Model
DEC
CCW
CCW
CCW
CCW
CCW
CCW
CW
DEC
CCW
CCW
CCW
CCW
CCW
CCW
CW
Travel
2.045”
2.045”
2.045”
2.045”
2.045”
2.045”
2.473”
2.473”
2.889”
2.889”
2.889”
3.200”
3.433”
3.200”
3.433”
3.433”
5.341”
5.341”
5.341”
5.341”
1.767”
1.767”
1.767”
1.767”
1.767”
1.767”
1.767”
1.767”
1.767”
2.045”
2.045”
2.045”
VSR 111
VSR 151
VSR 221
VSR 301
VSS 451
VSS 601
VSS 751
VSS 901
VSS 1051
VSS 1201
VSS 1301
VSS 1501
VSS 1551
VSS 1801
VSS 1851
VSS 2101
VSS 2401
VSS 2601
VSS 2801
VSS 3001
VSM 71
CW
CW
CW
CW
0.91
0.91
0.91
0.91
0.91
0.91
1.09
1.09
1.22
1.22
1.22
1.36
1.48
1.36
1.48
1.48
1.80
1.80
1.80
1.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.80
0.91
0.91
0.91
328
328
328
328
328
328
392
392
439
439
439
490
533
490
533
533
648
648
648
648
288
288
288
288
288
288
288
288
288
328
328
328
3.568” 0.52
3.568” 0.52
3.568” 0.52
3.568” 0.52
3.568” 0.52
3.568” 0.52
4.283” 0.63
4.283” 0.63
4.777” 0.74
4.777” 0.74
4.777” 0.74
5.325” 0.82
5.823” 0.87
5.325” 0.82
5.823” 0.87
5.823” 0.87
7.072” 1.36
7.072” 1.36
7.072” 1.36
7.072” 1.36
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.141” 0.45
3.568” 0.52
3.568” 0.52
3.568” 0.52
187
187
187
187
187
187
227
227
266
266
266
295
313
295
313
313
490
490
490
490
162
162
162
162
162
162
162
162
162
187
187
187
CW
CW
CW
CW
CW
CW
CW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CCW
CW
VSM 91
CW
CW
VSM 101
VSM 151
VSM 181
VSM 201
VSM 301
VSM 361
VSM 401
VSM 501
VSM 601
VSM 701
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CW
CCW
CCW
CCW
CCW
CCW
CCW
CW
CW
CW
CW
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14 – 4
Section 14 • Slide Calibration
Slide Valve Troubleshooting Guide
The Analog output card of the Vission 20/20 produces a 4–20mA signal to any attached devices. However, it is not
uncommon that small differences in the board components might result in small differences in the output. So this
screen offers the operator the ability to fine tune the upper and lower output values, see Table 14-2. Slide Valve
Troubleshooting Guide.
Table 14-2. Slide Valve Troubleshooting Guide (1 of 2)
Problem
Reason
Solution
Dirt or debris is blocking one or both Clean the optocoupler slots with a
optocoupler slots.
cotton swab and rubbing alcohol.
Adjust the photochopper so that
the fence extends further into the
optocoupler slots. Make sure the
motor brake operates freely and
the photochopper will not contact
the optocouplers when the shaft is
pressed down.
The photochopper fence extends
less than about half way into the
optocoupler slots.
The actuator cannot be calibrated.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
The white calibrate wire in the grey
Turck cable is grounded.
Dirt and/or condensation on the
position sensor boards are causing it
to malfunction.
Clean the boards with an electronics
cleaner or compressed air.
The calibrate button is stuck down.
The position sensor has failed.
Try to free the stuck button.
Replace the actuator.
Push button is being held down for
more that ¾ second when going
through the calibration procedure.
Depress the button quickly and then
let go. Each ¾ second the button is
held down counts as another press.
The white calibrate wire in the
grey Turck cable is grounding
intermittently.
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
The actuator goes into calibration
mode spontaneously.
Increase the distance between the
EMI source and the actuator.
A very strong source of electromag-
netic interference (EMI), such as a
contactor, is in the vicinity of the
actuator or grey cable.
Install additional metal shielding ma-
terial between the EMI source and
the actuator or cable.
The motor was manually moved
while the position sensor was not
powered.
Recalibrate.
The actuator does not transmit the
correct position after a power loss.
The motor brake is not working
properly.
Get the motor brake to where it op-
erates freely and then recalibrate.
The position sensor’s EEPROM
memory has failed.
Replace the actuator.
The photochopper is misaligned
with the slotted optocouplers.
Try to realign or replace the actuator.
There is a rapid clicking noise when
the motor is operating.
The motor brake is not working
properly.
Get the motor brake to where it op-
erates freely and then recalibrate.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
14 – 5
Section 14 • Slide Calibration
Table 14-2. Slide Valve Troubleshooting Guide (2 of 2)
Problem
Reason
Solution
There is a rapid clicking noise when
the motor is operating. (Continued) memory has failed.
The position sensor’s EEPROM
Replace the actuator.
The photochopper is misaligned
with the slotted optocouplers.
Try to realign or replace the actuator.
There is a rapid clicking noise when
the motor is operating.
Adjust the photochopper so that
the fence extends further into the
optocoupler slots.
The photochopper is positioned too
low on the motor shaft.
A motor bearing has failed.
Replace the actuator.
There is a loose connection in the
screw terminal blocks.
Tighten.
There is a loose or dirty connection
in the yellow Turck cable.
Clean and tighten.
The motor operates in one direction
only.
The position sensor has failed.
Replace the actuator.
Replace the actuator.
There is a broken motor lead or
winding.
The motor will resume operation
when it cools. This could be caused
by a malfunctioning control panel.
Consult the factory.
The thermal switch has tripped be-
cause the motor is overheated.
Any of the reasons listed in “The mo-
tor operates in one direction only”.
The motor will not move in either
direction.
See above.
The command shaft is jammed.
Broken gears in the gear-motor.
Free the command shaft.
Replace the actuator.
Check and replace blown relays and/
or fuses.
Blown relays or fuses.
This could be caused by a malfunc-
tioning control panel. Consult the
factory.
The motor runs intermittently, sev-
eral minutes on, several minutes off. mal switch is tripping.
Motor is overheating and the ther-
Bad thermal switch.
Replace the actuator.
The motor runs sporadically.
Any of the reasons listed in “The mo-
tor will not move in either direction”.
See above.
Stripped gears inside the gear rotor,
or the armature has come unpressed Replace the actuator.
from the armature shaft.
The motor runs but output shaft will
not turn.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
14 – 6
Section 14 • Slide Calibration
Slide Valve Actuator Troubleshooting Guide Blink Code
Vilter actuators communicate problems discovered by the internal diagnostics to the technician by LED blink codes.
Only one blink code is displayed, even though it is possible that more than one problem has been detected. The actua-
tor motor will not operate until the error code is cleared by pressing the blue bottom, see Table 14-3. LED Blink Codes
and Troubleshooting Guide.
Table 14-3. LED Blink Codes and Troubleshooting Guide (1 of 2)
Flash Pattern
Meaning
* = ON - = OFF
Calibration step 1.
Calibration step 2.
*-*-*-*-*-*-*-*-*-*-*-*-
*---*---*---*---*---*---
This indicates a zero span. This error can only occur dur-
ing calibration. The typical cause is forgetting to move
the actuator when setting the upper limit of the span.
If this is the case, press the blue button to restart the
calibration procedure. This error can also occur if either
or both of the slotted optocouplers are not working. If
this is the case, the slide valve actuator will have to be
replaced.
The operation of the slotted optocouplers can be tested
as follows:
*--*--------------------
1. Manually rotate the motor shaft until the aluminum
photochopper fence is not blocking either of the opto-
coupler slots.
2. Using a digital multimeter, measure the DC voltage
between terminal 3 of the small terminal block and TP1
on the circuit board (see Note 1). The measurement
should be between 0.1 and 0.2 Volts.
3. Next, measure the DC voltage between terminal 3
and TP2 on the circuit board. You should measure be-
tween 0.1 and 0.2 Volts.
A motor over-speed occurred. At some time during
operation, the motor armature spun too fast for the
encoder to measure. A nonfunctional motor brake is
usually to blame. This error means that the slide valve
actuator is no longer transmitting accurate position
information. The actuator should be recalibrated as
soon as possible, after the cause of the over-speed is
identified and corrected. This error will not clear until
the actuator is re-calibrated.
*-----------------------
Note 1: TP1 and TP2 are plated-thru holes located close to the slotted optocouplers on the board. They are clearly
marked on the board silkscreen legend.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
14 – 7
Section 14 • Slide Calibration
Table 14-3. LED Blink Codes and Troubleshooting Guide (2 of 2)
Flash Pattern
Meaning
* = ON - = OFF
The motor is overheated. The actuator motor will not
run until it cools. Once the motor cools, the actuator will
resume normal operation.
Motor overheating is sometimes a problem in hot
humid environments when process conditions demand
that the slide valve actuators reposition often. Solutions
are available; consult your Vilter authorized distributor
for details.
*--*--*-----------------
Another possible cause for this error is a stuck motor
thermal switch. The thermal switch can be tested by
measuring the DC voltage with a digital multimeter be-
tween the two TS1 wire pads (see Note 2). If the switch
is closed (normal operation) you will measure 0 Volts.
The 24V supply voltage is low. This will occur momen-
tarily when the actuator is powered up and on power
down.
If the problem persists, measure the voltage using a
digital multimeter between terminals 3 and 4 of the
small terminal block. If the voltage is less than 24V, the
problem is in the supply to the board.
*********************
If the voltage is >= 24V, replace the actuator..
The EEPROM data is bad. This is usually caused by loss of
24V power before the calibration procedure was com-
pleted. The actuator will not move while this error code
is being displayed. To clear the error, calibrate the actua-
tor. If this error has occurred and the cause was not loss
of 24V power during calibration, the EEPROM memory
is bad and the actuator will need to be replaced.
-********************
*****----*--------------
Microcontroller program failure. Please notify your
Vilter authorized distributor.
Note 2: The TS1 wire pads are where the motor thermal switch leads solder into the circuit board. They are clearly
marked on the board silkscreen legend and are oriented at a 45° angle.
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14 – 8
Section 15 • Trend Chart
Overview
Chart Operation
This screen allows the operator to view and adjust set-
tings for the trend chart, see Figure 15-1. Trend Chart
Screen. Trending feature can be started & stopped from
this screen. Up to four variables can be selected for plot-
ting on screen. Each variable is assigned one of four
colors; the plotted trace and the vertical axis labels for
a variable will be in its assigned color. The operator can
select from viewing the plot to selecting which variables
and time intervals to show as often as necessary. The
vertical axis scaling and offset for each variable plotted
is based on its range of values over the entire data plot-
ted on screen. The data available for display is 120 hours
maximum.
Pen Selection:
• Pen selection allows operator to select different pens
for plotting of data on the screen. The operator can
select “None” as an option for disabling plotting of
data for particular pen. Options in pen selection
drop-down box will depend on channels selected in
Trend Setup screen.
Start/Stop:
• This button allows the operator to start/stop trend
feature. When trend feature is not running, button
will display “Start” and will be green in color. While
trend feature is running, button will display “Stop”
and will be red in color. When “Stop” button is
pressed, trend data is saved to a file.
Zoom In/Out:
• These buttons allow the operator to adjust the num-
ber of data points plotted on the screen. At maximum
Figure 15-1. Trend Chart Screen
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
15 – 1
Section 15 • Trend Chart
zoom level operator can view 3 minutes of trend data
and Zoom In button will be inactive. At minimum
zoom level operator can view full 120 hours of trend
data and Zoom Out button will be inactive.
Trend Data Storage
The trend analysis screen shows recorded data for prob-
lem analysis or tuning improvements. A logging buffer
holds 5 minutes of data sampled at 10 second intervals.
Back/Forward:
• These buttons allow the operator to move the plot
and view trend data at different time intervals.
When the logging buffer fills with 5 minutes of data, it
is automatically transferred to a temp csv file. A temp
trend file will hold up to 1MB of accumulated data.
When the temp file has accumulated 1MB of data, data
from temp file is written to new trend file and temp file
is overwritten with new data in logging buffer till next
1MB of data. When a total of 15MB of trend data is accu-
mulated, and the logging buffer has filled with another
5 minutes of data to write, the file with the oldest trend
data is deleted.
• Forward button will be inactive when the operator
is viewing the first data point plotted on the screen
(i.e. when time interval is displaying 0:00). Back but-
ton will be inactive when the operator is viewing the
last data point on the screen (i.e. when time interval
is displaying 120:00). At minimum zoom level, Back
& Forward buttons will be inactive.
Trace:
• This button allows the operator to move a white cur-
sor line across all four trend lines and receive a read-
out of all four variables at that point in time. When the
Trace button is pressed, cursor position is displayed
along with value of all four variables on the screen.
Hold:
• This button allows the operator to stop the data from
advancing on the display without stopping the trend
feature. When the Hold button in pressed, Hold Time
is displayed on the screen.
Trace Back( < ) / Forward ( > ):
• These buttons allow the operator to move a white
cursor line across trend lines and view trend data
value at that point. These buttons will only be active
when Trace button is pressed. When these buttons
are pressed, cursor is moved and trace position is up-
dated on the screen.
Setup:
• This button allows operator to open the Trend Setup
screen. This button is inactive when the trend feature
is running.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
15 – 2
Section 15 • Trend Chart
Setup
The operator can modify trending options through the
Trend Setup screen, see Figure 15-2. Trend Setup Screen.
Trend Setup screen can be accessed by pressing the
Setup button when the trending feature is not run-
ning. Trend Setup screen allows the operator to select
a maximum of 10 analog I/O channels for trending. The
operator can also set a path for trend data files from the
drop-down box in the setup screen. The USB will appear
as an option in drop-down box only when a USB drive is
mounted on the panel.
If there is no space available on the USB or when the USB
is unmounted from the panel and USB is selected for sav-
ing trend files, trend data files will be written to hard disk.
If the operator changes Press/Temp units from the con-
figuration screen when running the trending feature,
then the background trending will stop.
Figure 15-2. Trend Setup Screen
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
15 – 3
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
15 – 4 / Blank
Section 16 • Event List
Time:
Overview
• Displays the time of the event in HH:MM:SS format.
Event Type:
This screen is designed to display compressor events in
chronological order. The information available on the
screen is valuable for understanding the operation of the
compressor and troubleshooting, see Figure 16-1. Event
List Screen. This screen Is divided into four columns and
can list up to 128 separate events. The operator can
download the information on the event list through the
Data Backup Screen.
• Displays the type of message for a particular listing.
Common type are “Start”, “Stop”, “Trip”, “Inhibit”,
“Alarm”, and “System”. These help the operator to
understand the meaning of the message in the next
column.
Message:
• Displays the informational string that describes the
event.
Event list Columns
Date:
• Displays the date of the event in MM-DD-YYYY
format.
Figure 16-1. Event List Screen
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
16 – 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
16 – 2 / Blank
Section 17 • Input / Output
Overview
This screen displays “Live Data” of all the analog points
and digital points being monitored. There are four
pages of Input / Outputs (I/O) available for viewing, see
Figures 17-1, 17-2, 17-3 , 17-4 and 17-5. This screen also
takes a snapshot of all the I/O points if the compressor
experiences a trip condition and saves this data as Freeze
pages, for example, see Figure 17-6. Up to five Freeze
pages can be saved. The oldest Freeze page will be re-
moved when more than five Freeze events occur. These
Freeze events can be downloaded to a USB drive though
the Data Backup screen, see Section 20.
Figure 17-1. Input/Output Screen - Page 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
17 – 1
Section 17 • Input / Output
Figure 17-2. Input/Output Screen - Page 2
Figure 17-3. Input/Output Screen - Page 3
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17 – 2
Section 17 • Input / Output
Figure 17-4. Input/Output Screen - Page 4
Figure 17-5. Input/Output Screen - Page 4 (Remote Oil Cooler Enabled)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
17 – 3
Section 17 • Input / Output
Figure 17-6. Input/Output Screen - Freeze Data Page
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
17 – 4
Section 18 • Auxiliary Input / Output
alarm, a trip, and an inhibit on either a high or low in-
put. A low input is 0vac and a high is 120vac on the en-
abled input. Leaving all options in their default setting
will mean no action will be taken on an enable input. The
input will simply be available for viewing at the panel or
by communications.
Overview
The Auxiliary Input/Output (I/O) section of the Vission
20/20 gives the operator flexibility to add peripheral
instruments and/or devices such as motors, valves and
solenoids. With these additions, customer configurable
I/Os are useful in expanding the functions of the Vission
20/20 where it was not explicitly designed to control.
Trip/Alarm Check:
Setting up one or more of the auxiliary inputs or out-
puts start with the configuration screen. In order to en-
able the auxiliary I/O, the Vission 20/20 must first be
equipped with one of the available expandable I/O cards
and the card must be selected on page 6 of the configu-
ration screen. Once the appropriate card is available,
then the operator will be permitted to enable and name
the desired auxiliary I/O. The operator can then navigate
to the Auxiliary I/O screen where the operator can define
• Selecting this checkbox enables the alarms and/or
trip functions of the Vission 20/20 for the desired
digital input. The accompanying drop-down box
gives the operator the flexibility to choose whether
the alarm and/or tip occurs if the input is high or low.
Inhibit Check:
• Selecting this checkbox enables the inhibit function
of the Vission 20/20 for the desired digital input. An
inhibit check prevents the compressor from starting
if the condition is true where a trip will shut down
the compressor after it as started. The inhibit can be
selected to inhibit on a high or low input and can be
selected to work with or without the alarm and trip
function
how that I/O will operate.
Digital Inputs:
The Digital Inputs section of the auxiliary I/O allows an
operator to configure the auxiliary digital inputs, see
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page
1). The digital input can be configured to produce an
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page 1)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
18 – 1
Section 18 • Auxiliary Input / Output
Digital Relay:
Digital Outputs
• The digital relay option is used to pass along the in-
formation from a digital input to another control de-
vice or to operate a peripheral device. This output can
be configured to either reflect the selected input or
show the opposite value.
The digital outputs section of the Auxiliary I/O screen
allows an operator to configure the auxiliary digital
outputs, see Figure 18-2. Auxiliary I/O Screen - Digital
Outputs (Page 2). The digital output can be configured
to activate (go High, 120vac) based on either a digital
input or a specified level on an analog input. Every digital
and analog input in the Vission 20/20 are made available
for controlling a digital output.
• Mirror:
• Selecting this option will produce a high out-
put when the selected input is High; and pro-
duce a low output when the selected input is
low.
Analog Input:
• Invert:
• Selecting the Analog Input radio button fills the
Active Input drop-down box with all available analog
inputs. One of the analog inputs can then be selected
to control the digital outputs.
• Selecting this option will produce a low out-
put when the selected input is high; and pro-
duce a High output when the selected input is
low.
Digital Input:
• Selecting the Digital Input radio button fills the
Active Input drop-down box with all available digital
inputs. One of the digital inputs can then be selected
to control the digital outputs.
Analog Inputs
The Analog inputs section of the auxiliary I/O screen al-
lows an operator to define the function of an instrument
connected to the Vission 20/20. For Auxiliary Analog
Inputs Screens, see Figure 18-3, 18-4 and 18-5. The ana-
log inputs can be configured to simply monitor an input
for informational purposes or used as a control input for
the auxiliary digital and analog outputs. The analog in-
puts can also be configured to alarm, trip, and inhibit on
specified values.
Run Always:
• Selecting this checkbox enables the function that
controls the digital output to operate only when the
compressor is running or runs all the time.
Analog Trigger:
• The analog trigger toggles the digital output based
on a specified value plus the specified differential
value.
• Alarm / Trip:
• Analog Trigger value:
• This drop-down box allows the operator to
select whether the analog input should gener-
ate an alarm, trip, or both when the input value
exceeds the limits entered into the alarm and
trip entry boxes.
• This defines the specified value in which the
output will toggle. This is an absolute value
and not based on units. For example, 100 could
mean temperature or pressure depending on
the type of input selected.
• Inhibit:
• N/O & N/C:
• Selecting this checkbox will prevent a start if
the input value exceeds the alarm limit values.
• Choosing the Normally Open (N/O) or
Normally Closed (N/C) radio buttons defines
what the output will be above or below the trig-
ger value. In the N/O setting, the output will be
off (0vac) while the input value is below the trig-
ger value.
• Low Alarm:
• This defines the lower limit of the input value
that when exceeded will generate an alarm.
• High Alarm:
• Differential:
• This defines the upper limit of the input value,
that when exceeded will generate an alarm.
• This is the differential around the trigger val-
ue. For example, if a trigger value of 100 is en-
tered with a differential of 1, then as the value
increases to 101, the output will be triggered. If
the value decreases to 99, then the output will
be toggled in the opposite direction.
• Low Trip:
• Defines the lower limit of the input value that
when exceeded will generate a trip.
• High Trip:
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
18 – 2
Section 18 • Auxiliary Input / Output
Figure 18-2. Auxiliary I/O Screen - Digital Outputs (Page 2)
Figure 18-3. Auxiliary I/O Screen - Analog Inputs (Page 3)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
18 – 3
Section 18 • Auxiliary Input / Output
• Defines the upper limit of the input value that
I = Integral (reset):
when exceeded will generate a trip.
• Used to integrate the error over time, to account for
a small error that has persisted for a long time. This
quantity is used for fine adjustment. This setpoint is
used to smooth out process variations. This setpoint
should be set high enough to prevent hunting but
not too high or it will cause control system overshoot.
Analog Outputs
This screen allows to map any standard analog input or
auxiliary input to any of the four analog auxiliary out-
puts. There are two pages of auxiliary output configura-
tion, each consists of two analog auxiliary outputs. For
Auxiliary Outputs Screens, see Figures 18-6 and 18-7.
D = Derivative (rate):
• Used to account for how fast the error is changing,
positively or negatively.
• Active Input:
Scalable Control:
• Active Input can be selected from avail-
able standard analog inputs or auxiliary inputs.
Selected Active Input gets mapped to auxiliary
output.
• Minimum Input / Maximum Input:
• These setpoints defines minimum and maxi-
mum Input range for configured active input .
• Minimum Output / Maximum Output:
• Run Always:
• These setpoints defines minimum and maxi-
mum output. The Auxiliary output produces a
linear value based on these settings.
• “Run Always” option can be selected to en-
able mapped auxiliary output irrespective of the
compressor’s run state. If “Run Always” is not
selected then the mapped auxiliary output is
enabled only when compressor is running.
• Trigger:
• Trigger configuration is used to enable / dis-
able auxiliary output according to the config-
ured trigger input. Trigger input can be selected
from available standard analog inputs , auxiliary
analog inputs or digital inputs. Trigger value
and differential in combination with trigger
type (“enable if above / On” or “enable if below /
Off”) enables or disables auxiliary output.
Control
Auxiliary outputs can be PID Controlled or Scalable
Controlled.
PID Control:
P = Proportional (gain):
• Used to adjust the auxiliary output in direct propor-
tion to the difference between the control setpoint
and the active input . The proportional term is a unit
less quantity and is used for coarse adjustment. This
setpoint should be set to the lowest value that gives
adequate control system response. Increasing the
proportional setting increases the control system’s
sensitivity to small process fluctuations and the ten-
dency to hunt.
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18 – 4
Section 18 • Auxiliary Input / Output
Figure 18-4. Auxiliary I/O Screen - Analog Inputs (Page 4)
Figure 18-5. Auxiliary I/O Screen - Analog Inputs (Page 5)
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18 – 5
Section 18 • Auxiliary Input / Output
Figure 18-6. Auxiliary I/O Screen - Analog Outputs (Page 6)
Figure 18-7. Auxiliary I/O Screen - Analog Outputs (Page 7)
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18 – 6
Section 19 • Configuration
Press Units:
Overview
• Drop-down Box to select the pressure units. Psig, Bar,
and Kpa are the possible selections and the units will
be displayed for every pressure value throughout the
screens.
The configuration screen is where most of the Vission
20/20 features are enabled and configured. The initial
setup of the Vission 20/20 will generally start here, see
Figure 19-1. Configuration Screen - Initial Setup (Page
1). Depending on what is selected, different portions of
the Vission 20/20 will be available to the operator.
Order Num:
• Identifies the Order number of the purchase of the
compressor. This Number will be needed If the opera-
tor requires help from Vilter.
Run Hours:
Units
• Offers the ability to change the compressor run
hours. This is typically used when replacing an older
micro controller on and existing compressor with a
new Vission 20/20.
This section sets how values will be represented through
out the program.
Temp Units:
• Drop-down box to select the temperature units from
Fahrenheit and Celsius. Once selected, all screen
temperatures will be displayed in the chosen units.
Figure 19-1. Configuration Screen - Initial Setup (Page 1)
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19 – 1
Section 19 • Configuration
selected, the remainder of the serial setpoints will be
available for editing.
Time & Date
Panel ID:
This section sets the time and date of the Vission 20/20.
Accurate time and date are accentual for accurate log-
ging and troubleshooting. Setting these parameter will
set the hardware clock embedded in the Vission 20/20
CPU. If the time is not retained after powering down the
panel, the operator should check and/or replace the coin
style battery on the panel SBC behind the touchscreen.
• Panel Identifier used by the controller when commu-
nicating with multiple panels.
Port:
• The Vission 20/20 has two ways to communicate on
serial bus. Either via the built in serial port, P12, or
through one of the USB ports. This drop-down box
allows the operator to chose which one will be used.
Format:
• Selection to choose between 12 hour or 24 hours
clock.
Baud Rate:
• Sets the Baud Rate for the serial communication.
Hour:
Data Bits:
• Entry box to set the clock hours. AM or PM drop-down
box will available if the 12 hour format is selected.
• Fixed at 8 Data bits.
Minute:
Stop Bits:
• Entry Box to set the clock minutes.
• Identifies the end of character for re-synchronizing.
Second:
Parity:
• Entry Box to set the clock seconds.
• Identifies the type of error detection.
Year:
Ethernet:
• Entry Box to set the current year.
Month:
• Enables the Ethernet port. Once selected, the re-
mainder of the Ethernet setpoints will be available for
editing.
• Entry Box to set the current month.
Day:
Panel ID:
• Panel Identifier used by the controller when commu-
• Entry Box to set the current date.
nicating with multiple panels.
IP Address:
Communications
• Entry box to set the IP address.
Subnet Mask:
The communication section is the control center for all
communications to the Vission 20/20 panel. It is possi-
ble to have multiple modes of communications enabled
and used. However, only one mode can be used to con-
trol the Vission 20/20 which is selected in the “Active
Remote Control” drop-down box. For a complete list
of communication registers, please refer to the Vission
20/20 communication table.
• Entry box to set the Subnet Mask.
Gateway:
• Entry box to set the Gateway address.
Protocol:
• Drop-down box to select the type of protocol used to
remotely control the Vission 20/20.
Active Remote Control:
Touchscreen
• Selects the mode of remote control. The operator
can select between Direct I/O, Serial, or Ethernet.
The “Calibrate” button changes the screen into touch-
screen calibration mode. Calibrating the touchscreen
is only required if the operator finds that the pointer ar-
row no longer follows his finger. The calibration mode
requires the operator to touch the four corners of the
touchscreen and then the accept button.
Direct I/O:
• Enables the Direct I/O inputs. Once selected a pop-up
will be displayed and the operator will need to choose
a one of the three Direct I/O options
Serial (Modbus RTU):
• Enables the Serial Modbus RTU protocol. Once
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Section 19 • Configuration
Anti-Recycle
Anti-Recycle defines the method of motor protection
due to repeated motor starts. The operator has 3 choices
of protection. Hot starts allows only a certain number of
starts per hour before setting an hour to the anti-recy-
cle timer. The number of starts is set in the timer page.
Accumulative immediately adds time to the anti-recycle
timer once the compressor is started and the time can
be set in the timers screen. True anti-recycle adds to the
anti-recycle timer once the compressor is shutdown. The
motor of the compressor can not be restarted as long as
there is anti-recycle time left and the operator can view
this time on the top left corner of the main screen.
Restart On Power Failure
This feature of the Vission 20/20 offers the ability to de-
fine how the Vission 20/20 will handle a power failure.
This can also be useful to allow system controller to re-
gain control of the Vission panel without the need for
operator intervention.
Always:
• When selected, initiates a start after the panel pow-
ers back up after a power failure, but only if the com-
pressor was running before the power failure and
starts the compressor in Auto mode.
Never:
• When selected, prevents any automatic action once
the panel powers back up after a power failure.
Timed:
• When selected, initiates a start after the panel pow-
ers back up after a power failure and the operator set
timer runs out. When there are multiple compressor
in a larger system, it is recommended that the opera-
tor gives each compressor a different start times. A
restart will only occur if the compressor was running
before the power failure and starts the compressor in
Auto mode.
Remote Lock Off:
• When selected, turns the remote lock out off when
the panel powers up. Select this option if the opera-
tor wishes a system controller to regain control of the
Vission 20/20 without human interference.
Boot in Remote (Direct I/O)
• When selected, places the panel into remote mode
when the panel powers up. Select this option when
under direct I/O control and the system controller is
to gain control of the Vission 20/20 without human
interference.
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19 – 3
Section 19 • Configuration
Compressor Name:
Compressor Sequencing
• Unique identifier that is broadcasted to all other
Vission 20/20 units in the sequencing network.
The compressor sequencing is a feature of the Vission
20/20 that allows the operator to setup as many as five
compressor to automatically start, stop and maintain
system loads. The compressor that is designated as the
master will monitor systems parameter and make deci-
sions on how many compressor are required to meet the
load as efficiently as possible.
Language
Allows the operator to select the language in which all
screens will be displayed in.
Compressor Sequencing:
Model & Refrigerant
• Enables the compressor sequencing algorithms and
allows access to the compressor sequencing screen.
The values in this section provide the Vission 20/20 algo-
rithm critical information on how to efficiently and safely
control the compressor, see Figure 19-2. Configuration
Screen - Compressor Sequencing (Page 2).
Master:
• Identifies the panel as the master while in sequencing
control.
Slave:
Compressor:
• Identifies the panel as a slave while in sequencing
• Dropdown box to select the compressor type. This
control.
Figure 19-2. Configuration Screen - Compressor Sequencing (Page 2)
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19 – 4
Section 19 • Configuration
selection is critical for proper volume slide control.
Model:
Condenser Control
The values in this section enables the condenser con-
trol feature of the Vission 20/20. Once selected the
checkboxes will become available for selection and the
condenser control screen will be available via the menu
screen. Some of the options check boxes in this section
may not be available for selection unless the proper
I/O cards are installed and enabled, see Figure 19-2.
Configuration Screen - Page 2.
• Drop-down box to select the compressor size. This
selection is critical for proper volume slide control.
Refrigerant:
• Drop-down box to select the type of refrigerant. This
selection is critical for proper volume slide control.
Other (K-Factor):
• Optional setting to adjust volume slide control.
Ambient Sensor:
Compressor Control
• Enables the ambient temperature option for the con-
denser control algorithm.
Vilter compressors typically run in one of two control
modes, suction pressure or process temperature con-
trol, see Figure 19-2. Configuration Screen - Page 2.
Wetbulb Sensor:
• Enables the wetbulb temperature override option for
the condenser control algorithm.
VFD Fan:
Suction Pressure Control:
• Enables the VFD output option for the condenser
control algorithm.
• This defines the suction pressure input as the pro-
cess variable and all controls will be based on suction
pressure. The operator has the option to select up to
two controllers where each can have its own set of
setpoints.
Oil Pump
Process Temp. Control:
This section defines how the Vission 20/20 will control
the oil pump, see Figure 19-2. Configuration Screen -
Page 2.
• This defines the process temperature input as the
process variable and all controls will be based on the
process temperature. The operator has the option to
select up to two controllers where each can have its
No Pump:
• Disables all functions for oil pump control.
Cycling:
own set of setpoints.
• Enables option for cycling oil pump. Oil pump is cy-
cled on and off depending on compressor differential
pressure.
Optional Function Selection
The following options are additional features of the
Vission 20/20 that can be selected. Some of these op-
tions will not be available for selection unless the proper
I/O cards are installed and enabled, see Figure 19-2.
Configuration Screen - Page 2.
Full Time:
• Enables option for full time oil pump. Oil pump will
always be running while the compressor is running.
# Pumps:
• Not currently used
Oil Flow Control:
Compressor VFD:
• Enables the compressor motor VFD option.
% Slide Volume Position:
• Unused.
• Enables option for oil flow control. Oil flow control
will vary analog output for controlling danfoss valve
opening % depending on capacity slide position. Oil
flow control output will be regulated only when com-
pressor is running, start condition is over i.e. low oil
pressure timer is elapsed, pumpdown control opera-
tion is not running and oil injection temperature is
above oil injection temperature override setpoint. If
any of the above condition is not satisfied, then oil
flow analog output will be 4 mA which corresponds
Economizer Pressure:
• Enables the economizer pressure input.
Superheat Monitor:
• Enables the superheat safety algorithms.
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19 – 5
Section 19 • Configuration
to 100 % valve open.
Oil Cooling
The section defines how the Vission 20/20 will monitor
and/or control the temperature of the compressor oil,
see Figure 19-2. Configuration Screen - Page 2.
Thermosyphon:
• This defines the compressor oil cooling method as
thermosyphon.
H20 Oil Cooler:
• This defines the compressor oil cooling method as
water heat exchange.
Liquid Injection:
• This defines the compressor oil cooling method as
liquid refrigerant injection.
Solenoids:
• Enables the solenoid for liquid injection control.
Motorized Valve:
• Enables the motorized value for liquid injection con-
trolled by PID settings.
Remote Oil Cooler:
• Defines the compressor oil cooling method as
Remote Oil Cooler. Remote Oil Cooler vfd fan can
be enabled when Auxiliary Output board is installed
and enabled. Rest of the Remote Oil Cooler setpoints
can be defined by navigating to Remote Oil Cooler
Screen. Remote Oil Cooler and Condenser Control
feature are mutually exclusive.
Motor Current Device
The Vission 20/20 can read the motor current in a couple
of different ways. The following selections defines the
method, see Figure 19-2. Configuration Screen - Page 2.
Current Transformer:
• This defines the input used for motor current when a
current transformer is used.
4-20ma Transformer:
• This defines the input used for motor current.
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19 – 6
Section 19 • Configuration
Digital Inputs
The Vission 20/20 has several digital inputs that the op-
erator can choose how the input will be used. Once an
input is enabled, the Auxiliary I/O screen will be avail-
able from the menu screen where the operator can
further define the inputs operation, see Figure 19-3.
Configuration Screen - Digital Auxiliaries (Page 3).
Enable Input #:
• Enables the selected digital input.
Set Name:
• Allows the operator to assign a name to the input.
Figure 19-3. Configuration Screen - Digital Auxiliaries (Page 3)
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19 – 7
Section 19 • Configuration
Analog Inputs
The Vission 20/20 has several Analog inputs that the
operator can choose how the input will be used. Once
an input is enabled, the Auxiliary I/O screen will be avail-
able from the menu screen where the operator can
further define the inputs operation, see Figure 19-4.
Configuration Screen - Analog Auxiliaries (Page 4).
Enable Input #:
• Enables the selected analog input.
Set Name:
• Allows the operator to assign a name to the input.
Figure 19-4. Configuration Screen - Analog Auxiliaries (Page 4)
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19 – 8
Section 19 • Configuration
Analog Outputs
Digital Outputs
The Vission 20/20 has several Analog outputs that the
operator can choose how the outputs will be used. Once
an output is enabled, the Auxiliary I/O screen will be
available from the menu screen where the operator can
further define the outputs operation, see Figure 19-5.
Configuration Screen - Analog Outputs (Page 5).
The Vission 20/20 has several Digital outputs that the
operator can choose how the output will be used. Once
an output is enabled, the Auxiliary I/O screen will be
available from the menu screen where the operator can
further define the outputs operation, see Figure 19-5.
Configuration Screen - Page 5.
Enable Output #:
Enable Output #:
• Enables the selected analog output.
Set Name:
• Enables the selected digital output.
Set Name:
• Allows the operator to assign a name to the output.
• Allows the operator to assign a name to the output
Figure 19-5. Configuration Screen - Analog and Digital Outputs (Page 5)
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19 – 9
Section 19 • Configuration
Digital Input/Output 1:
I/O Configuration
• Enables the optional digital input/output card 1
Digital Input/Output 2:
If any additional I/O card are added to Vission 20/20, this
is where these cards are enabled for use by the Vission
20/20 algorithms. Some feature of the Vission 20/20
will not be available unless specific expansions cards are
selected, see Figure 19-6. Configuration Screen - I/O
Configuration (Page 6).
• Enables the optional digital input/output card 2
Analog Input 1:
• Not editable by the operator. Identifies that the
Analog Input card 1 is enabled.
Analog Input 2:
Digital Output 1:
• Not editable by the operator. Identifies that the
• Not editable by the operator. Identifies that the
Analog Input card 2 is enabled.
Digital Output card 1 is enabled.
Analog Input 3:
Digital Output 2:
• Enables the optional Analog input card 3.
Analog Input 4:
• Not editable by the operator. Identifies that the
Digital Output card 2 is enabled.
• Enables the optional Analog input card 4.
Analog Output:
Digital Input 1:
• Not editable by the operator. Identifies that the
• Enables the optional Analog Output card.
Digital Input card 1 is enabled.
Figure 19-6. Configuration Screen - I/O Configuration (Page 6)
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19 – 10
Section 20 • Data Backup
Refresh:
Overview
• The Refresh button is used to initiate a scan of the
USB ports and list any devices found in the “Available
Devices” window.
The database backup screen provides the operator a
way to extract information out of the Vission 20/20 for
backup purposes or diagnostics, see Figure 20-1 Data
Backup Screen. Through this screen, the operator can
download all the Setpoint Databases, Maintenance Logs,
Event Lists, Freeze Data, Trend Data and Compressor Run
Hours to a portable USB flash drive. That information can
then be uploaded back to the Vission 20/20 in the case
of data corruption or to update the Vission program.
Built in migrate function examines the previous setpoint
databases, compares it with newer program setpoint da-
tabase, and moves the old information into the new pro-
gram. In addition, this screen also allows the operator to
reset all values to the factory defaults.
Save / Load
Save / Load section is where the operator can either save
the Vission 20/20 setpoints and log information to a
USB flash drive or load from a USB flash drive back to the
Vission 20/20.
Save:
• Selecting save allows the operator to save the Vission
20/20 data to a USB flash drive using the information
provided further down the screen. The bottom but-
ton will be labeled “Save” when this is selected.
All of the information saved to the USB flash drive is
open information. Meaning none of the information is
encrypted and the operator is free to examine it. The log
files are all saved as simple ASCII text and the databases
can be examined with SQLite.
Figure 20-1. Data Backup Screen - Save/Load
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20 – 1
Section 20 • Data Backup
Load:
• Selecting load allows the operator to load data from
a USB flash drive to the Vission 20/20 using the in-
formation provided further down the screen. The
bottom button will be labeled “Load” when this is
selected.
Available Devices:
• This window displays any USB flash drive plugged
into one of the Vission 20/20 USB ports. Once one
of the available devices is selected, then the drives
contents will be displayed in the “Select Folder / File”
window. If the USB flash drive that is plugged in by
the operator is not showing up, then the operator
can try pressing the “Refresh” button at the bottom
of the screen. Unfortunately, not all USB flash drives
are compatible with the Vission 20/20 and will never
show up as available device.
Select Folder/File:
• This window displays the folders and files contained in
the USB flash drive selected in the “Available Devices”
window. The information from the Vission 20/20 will
be contained into a .zip file. So a zip file will have to
be selected to load or overwritten when saved. Once
a zip files is selected, the name will be shown in the
filename window.
Unmount:
• By pressing the Unmount button, any USB drive se-
lected in the “Available Devices” window will be dis-
connected from the operating system and can be
safely removed from the USB port.
Back:
• The back button returns the operator to the preced-
ing window display of files and folders.
Filename:
• This window is where the operator can give a name
to a saved backup file. This field will automatically be
populated if a file is selected in the “Select Folder/
File” window.
Settings:
• Using this table, the operator can choose to save or
load all or part of the information contained in the
Vission 20/20.
Data Items:
• Using this table, the operator can choose to save or
load all or part of the information contained in the
Vission 20/20 according to checkbox selections.
Save / Load Button:
• This button initiates the save or load process.
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20 – 2
Section 20 • Data Backup
Migrate
Factory Reset
Loading data from an older version of the Vission 20/20
software to a newer one can be complicated due to dif-
ferences in databases. This migrate function closely
examines each field in the database being loaded and
determines whether it can be used in the new program.
The Migrate function is executed automatically when a
data is loaded from a USB flash drive. The only time an
operator should have to use the following migrate but-
ton is if a new Vission 20/20 program is loaded over an
existing Flash card, see Figure 20-2. Data Backup Screen
- Migrate and Factory Reset.
The Factory reset button offers the operator the ability
to reset all the Vission 20/20 setpoints back to the facto-
ry default settings or a specific database. If the operator
finds that a screen will not load when selected, it is likely
that the database associated with that screen has been
corrupted. Unfortunately, data corruption is always a
possibility in any system. So this function was designed
to help the operator to regain control, see Figure 20-2.
Data Backup Screen - Migrate and Factory Reset.
Reset:
• This button initiates the process to revert the Vission
20/20 back to the factory default settings.
Migrate:
• This button initiates the migrate function.
Figure 20-2. Data Backup Screen - Migrate and Factory Reset
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20 – 3
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20 – 4 / Blank
Section 21 • Maintenance
Overview
Maintenance Name:
The maintenance screen is a convenient place to keep
track of the the maintenance performed and any up-
coming maintenance recommended by Vilter. Based on
this page, banners will be displayed on the lower status
bar. Yellow banners are to warn the operator of any up-
coming maintenance and red banners indicate mainte-
nance that is overdue.
• This column of tasks that should be performed at the
run hours indicated in Maintenance interval column.
Select the checkbox from the maintenance task name
and press “update” button to perform the sign-off.
Maintenance Interval (Hours):
• This column indicates the Run hours at which the task
in the first column should be performed. When a task
is selected, the maintenance interval will change to
reflect the next interval.
Checklist
Time Remaining (Hours):
The check list is where the operator will perform the
maintenance sign-off, see Figure 21-1. Maintenance
Screen - Checklist. Once the operator has selected the
item to sign off, pressing the “Update” button at the
bottom of the page will perform the sign-off operation
and list the maintenance performed in the maintenance
log.
• This column indicates the Run hours left before the
maintenance task should be performed.
Figure 21-1. Maintenance Screen - Checklist
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21 – 1
Section 21 • Maintenance
Time:
Notes
• Lists the time the maintenance task was performed.
User:
The notes tab allows the operator to make notes to any
other personnel that might have access to the Vission
20/20.
• Lists the operator name who performed the mainte-
nance task.
Maintenance Performed:
Log
• Lists the maintenance task that was performed.
Run Hours:
The maintenance log tab lists all the maintenance
tasks performed in descending order, see Figure 21-2.
Maintenance Screen - Log.
• Lists the run hours at which the maintenance task
was performed.
Date:
Chart
• Lists the date the maintenance task was performed.
This chart is the original maintenance chart that is pro-
vided with the compressor, see Figure 21-3. Maintenance
Screen - Chart.
Figure 21-2. Maintenance Screen - Log
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21 – 2
Section 21 • Maintenance
Figure 21-3. Maintenance Screen - Chart
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21 – 3
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21 – 4 / Blank
Section 22 • User Access
calibrating instrument will be available to an opera-
tor with this level of access.
Overview
• Level 3 – This is considered a contractor level of ac-
cess. The setpoints available at this level have the
most potential of causing damage to the compressor.
Therefore, this access is restricted to those only with
the highest level of competence.
The user access screen is where all operators go to log
in. In the Vission 20/20, each screen has a security level,
whereby allowing operators, technicians and/or supervi-
sors the ability to modify different sets of setpoints. The
Vission 20/20 has four levels of security, see Figure 22-1.
User Access Screen - Login.
The user access screen is also where new operators are
added, changed or removed. Any operator can add an
additional operator but can only add an operator of less-
er or equal security level.
• Level 0 – This is the default level with no operator
logged in. The function available to the operator are
very limited and basically only allows someone to
start and stop the compressor.
Apply
• Level 1 – This is a technician level of access. All the
setpoints needed to operate and adjust the perfor-
mance of the compressor will be available to an op-
erator with this level of access.
When selected, applies the user name and password
for security evaluation. If the User name and password
matches an existing user then the operators name will
be applied to the lower status bar and the operator will
be given access to screens of equal security level.
• Level 2 – This is a supervisor level of access. Setpoints
that require a higher level of knowledge such as
Figure 22-1. User Access Screen - Login
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22 – 1
Section 22 • User Access
password can be entered by touching the password
entry box and entering the password via the pop-up
keyboard.
Login
The login tab is where an operator will enter the users
name and password in order to gain access to Vission
20/20 screens.
Manage Accounts
Operators:
This tab allows the addition, removal, and modification
of authorized users, see Figure 22-2. User Access Screen
- Manage Accounts.
• All operators that have been added to the Vission
20/20 user tables will be displayed in this window. If
a name of an operator is selected from this window,
the name is added to the “Operator Name” entry box.
Operators:
Operator Name:
• This window contains the list of authorized users al-
ready added to the Vission 20/20. Selecting a name
from this list will add that name to the “Operator
Name” entry box.
• This entry box is for the operator’s username. The
operator can either select the username from the op-
erators window or enter the username manually by
touching the entry box and entering the name via the
pop-up keyboard.
Operator Name:
• This entry box is for the operator’s username who is
Operator Password:
to be added, removed or modified. The operator can
• This entry box is for the operator’s password. The
Figure 22-2. User Access Screen - Manage Accounts
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22 – 2
Section 22 • User Access
either select the username from the operators win-
dow or enter the username manually by touching
the entry box and entering the name via the pop-up
keyboard.
Add / Update:
• Pressing this button will initiate the creation or modi-
fication of the specified account.
Delete:
Operator Password:
• Pressing this button will delete the specified account.
• This entry box is for the operator’s password. The
password can be entered by touching the password
entry box and entering the password via the pop-up
keyboard.
VNC Account
Verify Password:
Vission 20/20 panels can be accessed remotely by us-
ing a VNC client over TCP/IP network. This tab allows
the operator to change default VNC Password and VNC
Port number, see Figure 22-3. User Access Screen - VNC
Accounts.
• This entry box is to verify the operator’s password.
Verifying the password can be entered by touching
the “Verify Password” entry box and entering the
password via the pop-up keyboard.
Security Level:
Change VNC Password
New Password:
• Select a security level for the account being added or
modified. Only levels that are equal to or less than the
operator’s own security level will be shown.
• The operator will add the password by touching the
entry box and typing the password via the pop-up
keyboard.
Figure 22-3. User Access Screen - VNC Accounts
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22 – 3
Section 22 • User Access
Verify New Password:
Update:
• The operator will re-enter the password by touching
the entry box and typing the password via the pop-
up keyboard.
• Pressing this button will initiate the modification of
the specified VNC account Port number.
Update:
Screen Security Levels
• Pressing this button will initiate the modification of
the VNC account.
The following table lists all screen and their base securi-
ty levels, see Table 22-1. Security Access Levels. The ma-
jority of the screens have more than one security level.
The base security level gives the user access to the set-
points that can change to performance of the compres-
sor. The secondary security level is typically level 3 and is
reserved for those setpoints that require great care and
knowledge of the system in order to change safely.
Change VNC Port Number
Port Number:
• The operator will change the port number for VNC
server by touching the entry box and typing via the
pop-up keyboard. Default port number is 5900.
Operator can assign port number ranging between
5900 to 6000.
Table 22-1. Security Access Levels
Security Access Levels
User Level
Level 0
Page
*Note
Event List
-
Input/Output States
Trend Chart
Level 0
-
Level 0
-
Help
Level 0
-
Alarms & Trips
Level 1*
Level 1
Level 3 required for constraints
Compressor Scheduling
Compressor Sequencing
Condenser Control
Compressor Control
Maintenance
-
Level 1
-
Level 1*
Level 1*
Level 1
Level 3 required for constraints
Level 3 required for constraints
-
Data Backup
Level 1*
Level 2
Level 3 required to upload data
Instrument Calibration
Service Option
Configuration
-
Level 2
-
Level 2*
Level 2
Level 3 required for pages 3 - 6
-
Slide Calibration
Timers
Level 2*
Level 3
Level 3 required for constraints
VNC Account
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22 – 4
Section 23 • Help Screen
connected USB drive, the names will be listed in this
section. The operator will have to navigate through
the file structure of the USB drive to find the docu-
ments. The top box in the USB drive will display any
USB drives mounted to the Vission 20/20 OS.
Overview
Use this screen to receive help on other setpoint screens
contained within the software. These help files can be ac-
cessed from any screen. The help files describe the func-
tionality of that screen as well as compressor operation.
• Touching one of the listed USB devices will select that
device and list any files or PDF documents contained
on the USB drive. Selecting a folder will open that
folder and display any sub-folders of PDF documents.
Screen Features:
Unmount:
Manual Tab:
• Pressing the unmount button will disconnect the USB
drive from the Vission 20/20 operating system. Once
the device has been remove from the device list, the
USB drive can be safely removed
• Contains the list of available manual sections to be
displayed in the display window, see Figure 23-1.
Help Screen - Manual.
Refresh:
USB tab:
• Pressing this button will reread the USB ports and dis-
play any new USB drives.
• The operator as the option to view other manuals,
typically Vilter compressor manuals on the Vission
20/20 from a USB drive, see Figure 23-2. Help Screen
- USB. If there are any PDF type documents on a
Figure 23-1. Help Screen - Manual
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23 – 1
Section 23 • Help Screen
Back:
Previous:
• Pressing the back button will rewrite the file/folder
• Changes the page in the display window one page
less then what was showing.
list with the previous folder level.
Display Window:
Next:
• This window displays the context of the manual.
Fullscreen:
• Changes the page in the display window one page
more then what was showing.
Version:
• Pressing this button expand the display window to fit
the entire screen.
• Pressing the Version button displays a pop-up screen
that gives the operator information of the version of
software running on the Vission 20/20, see Figure
23-3. Version Pop-Up Screen.
Page:
• Enter the page number the operator wishes to be dis-
played in the display window.
Figure 23-2. Help Screen - USB
Figure 23-3. Version Pop-Up Screen
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23 – 2
Section 24 • Twin Screw Control
• Standard - Selects the oil pump operation as
“Full Time”.
Overview
• Stal - Selects the oil pump control as “No
pump”.
The Vission 20/20 is capable of operating a twin screw
compressor from a number of different manufacturers.
The Vission 20/20 currently operates as a twin screw
controller in the full time oil pump and the no oil pump
configuration.
Menu Changes:
• When selecting the twin screw option there will be
other changes that occur in other menu pages.
Setup - Configuration Screen
• Volume position indicator will disappear from
the main screen and right data panel.
Configuration Screen:
• Prelube oil pump alarms and trip values will
be changed to default values for the twin screw
• To setup the Vission 20/20 panel for twin screw, navi-
gate to the Configuration Screen, page 2, and select
“VRS” from the dropdown box label “Compressor”,
see Figure 24-1. Twin Screw Control Screen. Once
selected, another dropdown box labeled “Operation
Type” will appear directly below the “Compressor”
drop-down box. You should also notice that the oil
pump control becomes grayed out because the oil
pump operation is now determined by the type of
compressor that is select from the “Type” drop-down
box.
• Run oil pump alarm and trip values will be
changed to default values for the twin screw.
Figure 24-1. Configuration Screen - Twin Screw Option
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24 – 1
Section 24 • Twin Screw Control
24-2. Slide Valve Calibration - Twin Screw Control.
“-” Button:
Operation
Once the twin screw is configured, its operation is
very similar as the single screw and all options that
are available for single screw configuration are also
available for twin screw. The only operational differ-
ence is the manual mode of operation. Twin screw
compressors can experience leaky slide seals that can
cause the capacity slide to drift after it has been po-
sitioned by the controller. To counteract the capacity
slide drift problem, the twin screw manual mode op-
eration has an added anti-drift feature that automati-
cally maintains the position of the hydraulic actuator.
• When the operator presses and holds this button,
the output associated with capacity slide decrease
is energized. If the actuator does not turn in the cor-
rect direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
“+” Button:
• When the operator presses and holds this button,
the output associated with capacity slide increase is
energized. If the actuator does not turn in the cor-
rect direction when this button is pressed, then the
operator will have to alter how the actuator is wired
to the panel.
Slide Calibration - Capacity Slide Valve
Potentiometer
Software limit setpoint:
• The Vission 20/20 uses the “Min Limit” and “Max
Limit” setpoint to define an area within the mechani-
cal stops for normal slide travel. These software limits
purpose is to prevent the slide from actually hitting
the mechanical stops which could result in a number
of undesirable consequences. By default, the soft-
ware limits are set to 150mV from either end point.
This section provides critical information and control pa-
rameters related to the capacity slide actuator. The “%
cap” display shows the actual value in percent of the ca-
pacity slide with out any conditioning that might be ap-
plied to the other capacity position displays. In addition,
this section displays the value of the actuator signals
in millivolts in the “input Value” display box, see Figure
Figure 24-2. Slide Calibration - Twin Screw Control
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24 – 2
Section 24 • Twin Screw Control
The position percentage is calculated from the soft-
ware limits. Therefore, it is possible to read a value
greater than 100% or less than 0% if inertial carries
the slides after these limits are reached.
Compressor Bump Pop-Up Window
• This window allows the operator to bump the com-
pressor to flush out any oil in the compressor after
a slide valve calibration, see Figure 24-3. Slide Valve
Calibration - Twin Screw Bump Pop-Up Window.
Position Signal Type:
• Position signals can be 0-5 VDC or 4-20mA to indi-
cate current slide valve position.
Figure 24-3. Slide Calibration - Twin Screw Bump Pop-Up Window
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24 – 3
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24 – 4 / Blank
Section 25 • Cool Compression Control
injection line into the suction chamber of the compres-
sor. This oil and liquid provides lubrication and cooling
until full pressure differential lubrication is attained. As
the differential pressure increases, the oil and liquid am-
monia is now injected into the screw during the com-
pression process and the oil injection valve is allowed to
close.
Overview
The cool compression compressor operation is similar
to the standard single screw compressor units, except
there is no external oil cooler to the unit. A blanket of
liquid ammonia lies on top of the oil in the oil separa-
tor. The liquid ammonia level is regulated by sensing
the liquid ammonia level with a level probe, and using
a positioning valve to vary the amount of liquid ammo-
nia being added to the separator. The cooling occurs
through the entire compression and separation process.
The Cool Compression compressor does not have an oil
pump. When the Cool Compression compressor unit is
commanded to start, the control panel first insures that
the slide valves are at their minimum positions. The suc-
tion oil injection solenoid (SOI) is energized – allowing a
path for oil to flow into the compressor. The compressor
now starts. There is an initial pressure drop in the suc-
tion chamber of the compressor and a corresponding
increase in pressure on the discharge of the compres-
sor. This creates a pressure differential that forces the
oil and liquid ammonia mixture through the suction oil
Setup
Configuration Screen:
• TosetuptheVission20/20panelforCoolCompression,
first ensure that an analog output card is installed in
the panel, and it is selected from page 6 of the con-
figuration screen, see Section 19. Navigate to config-
uration page 2, and select “R717-Cool Comp” from
the drop-down box that is labeled “Refrigerant”,
see Figure 25-1. Cool Compression Control Screen.
Once selected “Cool Compression” option will ap-
pear in Oil Pump and Oil Cooling sections and “Cool
Compression” gets selected automatically. It will also
Figure 25-1. Cool Compression Control Screen
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25 – 1
Section 25 • Cool Compression Control
enable Superheat Monitoring on the screen.
• As previously described, Cool Compression
compressor does not have an oil pump. Instead
it has a suction oil injection solenoid to pro-
vide oil and liquid ammonia for lubrication and
cooling.
Auto Load
• Auto load operation will force the compressor to
load to a minimum value once the compressor has
started. By loading the compressor to a minimum
value, and maintaining this capacity, a pressure ratio
is created across the compressor, to ensure adequate
lubrication of the compressor, and also that the com-
pressor does not experience high discharge super-
heat conditions. Since compressor lubrication is of
great importance, all load limiting is disabled when
auto load is engaged.
• Cool Compression liquid injection 1 and liq-
uid injection 2 outputs will operate as high / low
pressure ratio solenoid outputs.
Control Functions
• Auto Load at Start
In the Compressor Control Menu, special cool compres-
sion control functions are now available, see Figure 25-2.
Compressor Control Screen - Cool Compression Control
(Page 4). These new functions are:
• Defines the value at which Compressor (ca-
pacity slide) should be loaded (and maintained)
at start if Auto Load is enabled.
• Auto Load Timer
• Auto Load
• This timer defines the maximum time that
the Auto Load operation will be engaged. After
the timer expires, Auto Load will be disengaged.
• Suction Oil Injection Settings
• Danfoss Positioning Valve Settings
Figure 25-2. Compressor Control Screen - Cool Compression Control (Page 4)
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25 – 2
Section 25 • Cool Compression Control
• Auto load will be disengaged when one of the follow-
ing conditions occur;
Using a Positioning Valve for Liquid Ammonia Level
Control
• Pressure ratio reaches a value of 2.0 or
greater.
• A level probe inserted in the oil separator detects
liquid ammonia level. Based on the level of the am-
monia (0-100%), the level probe sends a directly pro-
portional 4-20 mA signal to the Vission 20/20 panel.
The positioning valve is then positioned based on the
Positioning Valve settings graph shown in Figure 25-
2. Cool Compression Control Functions Screen.
• Compressor has been running for 10 minutes
(defined by Auto Load Timer).
• Suction pressure setpoint has been reached.
• Looking at the graph, when the compressor starts,
the positioning valve placement (Vertical Axis) is de-
termined based on the liquid ammonia level that is
sensed in the oil separator (Horizontal Axis). It can
be seen that as the liquid ammonia level increases
(corresponding to a larger mA value), the positioning
valve moves towards a closed position.
Suction Oil Injection Setting
• In order to maintain adequate lubrication during low
pressure ratio conditions, the Suction Oil Injection
(SOI) solenoid is turned ON and the capacity of the
compressor is reduced.
• The SOI solenoid will cycle ON and OFF based on the
pressure ratio across the compressor.
• The Positioning Valve position (0-100% limits) is de-
• SOI Solenoid ON
fined at three distinct levels;
• Defines the Pressure ratio value at which
SOI is turned ON (default 2.00) (Digital Output
Board #1:2).
• Start Level (lowest liquid ammonia level - po-
sitioning valve at maximum open position).
• Leakage (normal operating position and am-
monia level).
• SOI Solenoid OFF
• Defines the Pressure ratio value at which SOI
is turned OFF (default 2.04) (Digital Output
Board #1:2).
• Overfill Leakage (highest liquid ammo-
nia level–positioning valve at minimum open
position).
• SOI Load Limit
• Defines the capacity slide position at which
the compressor capacity slide will unload to if
pressure ratio falls below “SOI Solenoid ON” set-
point. This setpoint is not active until Auto Load
disengages.
• Liquid ammonia levels are defined at four distinct lev-
els (4-20ma limits);
• Start SP (minimum liquid ammonia level in
separator – the positioning valve is maximum
open).
• The SOI solenoid will also cycle on if the discharge
temperature superheat reaches a value of 5°F (this
value is not settable). Generally, anytime the SOI
solenoid cycles on, the capacity is limited to the SOI
Load Limit setpoint. However, this is not true if the
SOI solenoid cycles on based on the discharge tem-
perature superheat 5°F rule. If discharge temperature
superheat continues to climb and reaches a value of
6°F, the compressor will be inhibited from loading. If
discharge temperature superheat still continues to
climb and reaches a value of 8°F or more, then the
compressor will be unloaded until the superheat
drops below 8°F or the capacity has reached the SOI
Load Limit setting.
• Linear SP (minimum level of liquid ammonia
for normal operating position).
• Upper SP (maximum level of liquid ammonia
for normal operating position).
• Max SP (maximum liquid ammonia level – po-
sitioning valve is minimum open position, main-
taining some leakage).
• On Alarms and Trips screen, Low Oil Separator Start
Temperature, High Filter Diff Start Pressure settings
are disabled.
• On Timers screen Oil Level #1 Safety Trip Delay, Oil
Level #2 Safety Trip Delay settings are disabled.
Operational Differences from Single Screw
Once the Cool Compression is configured, most setup
options available for a single screw are also available
for Cool Compression. However, there are significant
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25 – 3
Section 25 • Cool Compression Control
operational differences that are mostly associated with
the compressor safeties:
5.0, the solenoid is turned on. When the pressure ra-
tio falls back to below 4.8, the solenoid is turned off.
1. The Cool Compression program ignores,
• Low Oil Separator Alarm / Trip at start
• High Filter Differential at start
Level Switches
• There are two level switches in the oil separator, a
“high” and a “low”. During normal running opera-
tion, the oil level is above both switches. When the oil
level starts to drop and opens the high level switch,
a 10 minute timer starts. When the timer elapses a
flashing “add oil to middle of sight glass” message ap-
pears on the main screen. When the operator adds
enough oil to close the high level switch, the mes-
sage disappears.
• Prelube Oil Pressure Alarm and Trip
• Run Oil Pressure Alarm and Trip (Pressure
Ratios are monitored instead).
• High Discharge Temp Alarm and Trip
(Discharge Temp Superheat is monitored)
• Low Suction Temp Alarm and Trip
• Low Oil Injection Temp Alarm and Trip
• High Oil Injection Temp Alarm and Trip
NOTICE
2. SOI solenoid is forced on for first 60 seconds of run-
ning and 10 minutes after compressor is stopped.
If oil is not added and the oil level continues to drop
thereby opening the “low” oil level switch, a 10 minute
timer starts again. When the timer elapses, the com-
pressor shutdowns immediately and displays “Low Oil
Level” failure. If enough oil is added to close the low
level switch, then this will allow the opeator to press the
reset button and clear the “Low Oil Level” failure and
“Add Oil” message.
3. Auto Load Enabled: When Auto Load is engaged at
start, it then maintains the position of capacity slide to
the Auto Load limit (approx : 30 %, but less than 50 %).
It displays status message “Cool Compression Capacity
Hold” when it is running. Unless Auto load is disengaged
compressor will run at auto load limit position. Auto load
disengages if enough Pressure Ratio is built (typically
more than 2.04) or setpoints are achieved.
Oil Level Messaging After Compressor Stops
4. SOI Solenoid: During normal operation if pressure ra-
tio drops to a lower value (typically below 2.00) then it
energizes SOI solenoid and maintains the position of ca-
pacity slide to the SOI Load limit (approx : 30 %, less than
50 %). It also displays status message “Cool Compression
Capacity Hold”. If enough Pressure Ratio is built across
the compressor (typically more than 2.04), it again re-
sumes the run mode and control normally.
• The low level switch is monitored after the compres-
sor stops. If the switch opens after the compressor
stops, a two minute timer starts. If the switch stays
open, and the timer expires, a failure is generated
called “Lo Oil Level Fail after Stop” and the compres-
sor is disabled from restarting until oil is added to
close the low level switch. Note that this failure is
generated ONLY when the low level switch opens af-
ter the compressor stops.
5. It performs Cool Compression specific checks periodi-
cally like:
• Controlling the liquid level positioning valve
as liquid ammonia level changes .
• Low / high Pressure Oil Injection ports control
as Pressure Ratio and Superheat temperature
changes.
Supplemental Oil Cooling Solenoids
• Some cool compression units will have supplemental
oil cooling solenoids. One is called the suction liquid
injection solenoid and is controlled via discharge su-
perheat. When the discharge superheat reaches 5°F,
the solenoid is turned on. When it falls back to below
4°F, the solenoid is turned off. An additional solenoid
(referenced as SV4 – as called the High Press Ratio
solenoid) provides supplemental oil cooling based on
pressure ratio. When the pressure ratio rises above
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25 – 4
Section 26 • Remote Oil Cooler
Overview
Remote Oil Cooler Setpoint
This screen allows the operator to view and adjust
Remote Oil Cooler setpoint settings associated with
Remote Oil Cooler operation, see Figure 26-1. Remote
Oil Cooler Screen (Page 1). This screen will only be ac-
tive if the Remote Oil Cooler Control option has been
enabled from the Configuration Screen, see Section 19.
Run Mode:
• Run Mode allows the selection of different modes of
operation for Remote Oil Cooler. The choices for se-
lection are;
Run Never
• The mode of operation by default. Remote Oil Cooler
operation will not be performed when this mode is
active.
The Remote Oil Cooler Control operation allows the cy-
cling of fans and pumps in order to maintain a specific
Remote Oil Cooler Temperature. The five different steps
in step control allow selection of fans, pumps and VFD
in one or more steps. When a VFD is employed, VFD is
allowed to reach maximum speed, then if additional ca-
pacity is needed, the next fan or pump is brought on.
The VFD will modulate down and then back up to 100%
again, then the next fan or pump is brought on. This
method allows the smoothest Remote Oil Cooler control
by spacing the VFD between the fan and pump steps,
while maintaining a Remote Oil Cooler Temperature
pressure that matches the setpoint.
Run With Comp
• Automatic operation of Remote Oil Cooler selected
when cooling control is required to only run when the
compressor is running.
Run Always
• Automatic operation of Remote Oil Cooler selected
when cooling control is required to run even when
the compressor is off.
Figure 26-1. Remote Oil Cooler Screen (Page 1)
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26 – 1
Section 26 • Remote Oil Cooler
Manual
setpoint and the delay timers are satisfied. Step Delay
acts as “ON” timer while loading and acts as “OFF”
timer while unloading for the same step.
• Mode for controlling Remote Oil Cooler operation
manually. Operator controls the operation by manual
stepping using an on/off toggle button at each step.
Low Speed Fan:
Remote Oil Cooler Temperature:
• Allows steps to have option for time delay in case of
fan spin down. Any of Out #1 to Out #4 can be se-
lected as Low Speed Fan through combobox. E.g.:
Let’s say Out #2 is selected as Low Speed Fan in Step
2. When step 2 becomes active during Remote Oil
Cooler operation which is after Step 2 timeout de-
lay, Out #2 is left off for time as set by the operator
in High to Low Speed Delay. After low speed fan ener-
gizes, then timer for Step 3 starts timing.
• This is the read only parameter and it displays the
present value of Remote Oil Cooler Temperature.
Remote Oil Cooler Temperature is mapped on Analog
Auxiliary Input #5.
Remote Oil Cooler Temperature Setpoint:
• This is the Remote Oil Cooler Temperature setpoint
that needs to be maintained.
Control:
Upper Deadband:
• Toggle any of the steps On/Off during Manual opera-
tion of Remote Oil Cooler. This button is active only
when Run Mode selected is Manual. During Auto op-
eration of Remote Oil Cooler Control, control button
• This is the Remote Oil Cooler Temperature setpoint
upper deadband value.
Lower Deadband:
• This is the Remote Oil Cooler Temperature setpoint
lower deadband value.
for active step will be “ON”.
High to Low Speed Fan Delay:
VFD Settings
• This is time delay for fan spin down in case of 2 speed
motor/dual speed fan.
This page is active only when Remote Oil Cooler VFD is
selected in Configuration Screen, see Section 19. For
Remote Oil Cooler VFD Screen, see Figure 26-2. When a
VFD fan is used for the remote oil cooler oil cooling, the
speed of the VFD is controlled using PID algorithm.
Step Control
The Step Control allows the operator to setup the man-
ner in which Fans, Pumps & VFD will be turned on/off.
Fans & Pumps are connected on digital outputs Out #1
to Out #4. VFD Fan is connected on Analog Output. Each
step can have maximum of five outputs connected to it.
Each step can be opted in or out depending on enabling
of checkbox.
P = Proportional (gain):
• Used to adjust the fan speed action in direct propor-
tion to the difference between the control setpoint
and the process variable (SP - PV = error). The pro-
portional term is a unit less quantity and is used for
coarse adjustment. This setpoint should be set to the
lowest value that gives adequate control system re-
sponse. Increasing the proportional setting increases
the control system’s sensitivity to small process fluc-
tuations and the tendency to hunt.
When Run Mode is Auto and Remote Oil Cooler
Temperature rises above upper deadband, Remote Oil
Cooler step gets incremented from Step 1 to Step 5 and
hence switching on/off Pumps, Fans & VFD connected on
outputs. This holds true for decrementing of steps from
Step 5 to Step 1 when Remote Oil Cooler Temperature
falls below lower deadband.
I = Integral (reset):
• Used to adjust the capacity control action, integrat-
ing the error over time, to account for a small error
that has persisted for a long time. This quantity is
used for fine adjustment. This setpoint is used to
smooth out process variations. This setpoint should
be set high enough to prevent hunting but not too
high or it will cause control system overshoot.
Step Delay:
• Allows operator to set time delays between Remote
Oil Cooler steps. Remote Oil Cooler Temperature
must be outside upper or lower deadband continu-
ously for delay time in order to increase or decrease
Remote Oil Cooler steps. While in a VFD step, an ad-
ditional step can only be added once VFD has reached
its maximum speed setpoint and the delay timers are
satisfied. Similarly in a VFD step, a step can only be
removed once VFD has reached its minimum speed
D = Derivative (rate):
• Used to adjust the capacity control action, account-
ing for how fast the error is changing, positively or
negatively.
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26 – 2
Section 26 • Remote Oil Cooler
Maximum Speed:
Minimum Speed:
• This setpoint defines the maximum speed in per-
centage for Remote Oil Cooler VFD Fan at which it
should run for continuous step delay time to increase
Remote Oil Cooler steps. E.g. let’s say setpoint is kept
at 95%. Then Remote Oil Cooler VFD fan will have to
run at speed of 95% or more to advance to next step.
Maximum Speed can be set as 100%, which is when
analog output (at which Remote Oil Cooler VFD fan
is connected) reaches to 20mA in its normal range of
4-20 mA
• This setpoint defines the minimum speed in percent-
age for Remote Oil Cooler VFD Fan at which it should
run for continuous step delay time to decrease
Remote Oil Cooler steps. E.g. let’s say setpoint is kept
at 5%. Then Remote Oil Cooler VFD fan will have to run
at speed 5% or less to advance to next step. Minimum
Speed can be set as 0%, which is when analog output
(at which Remote Oil Cooler VFD fan is connected)
reaches 4mA in its normal range of 4-20 mA
Figure 26-2. Remote Oil Cooler VFD Screen (Page 2)
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26 – 3
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26 – 4 / Blank
Appendix A • Vission 20/20 Troubleshooting Guide
Vission 20/20 Troubleshooting Guide
In the event of a problem with the Vilter Vission 20/20, the help screen, along with your electrical drawings will help
determine the cause.
NOTICE
Before applying power to the Vission 20/20 control
panel, all wiring to the panel should be per the
National Electrical Code (NEC). Specifically check for
proper voltage and that the neutral is grounded at
the source. An equipment ground should also be run
to the panel.
Table A. Vission 20/20 Troubleshooting Guide
Problem
Solution
Vission 20/20 does not boot up, no Check that 120VAC is run to circuit breaker CB1 located on the terminal
lights light on any boards.
strip. The neutral should be brought to any “N” terminal on the terminal
strip.
Check that circuit breaker CB1’s switch is in the ON position.
Use a voltmeter to insure 120VAC is being applied to the power supply,
located on the door. Check that 120 volts is present at the F1 fuse on the
power supply, located on the front of the door. If all of the above are OK,
the power supply may be bad. To test the power supply, check DC voltages
at the power supply output. If proper voltages are not found at these test
points, the power supply may be faulty.
Vission 20/20 appears to be boot- Remove power COMPLETELY from the Vission 20/20 and restart the
ed, lights are lit on the boards, but controller.
no touchscreen display is evident:
WARNING
The inverter board creates a high rms voltage to drive
the backlight - it can exceed 1500VAC. Use extreme
caution and insure that voltage has been removed
from the board before physical inspection. Visually
check cable connections located on the LCD inverter
board. This board is located inside the door on the
LCD touch screen back plane next to the single board
computer. Physically inspect board to insure that
all cable connectors are connected tightly to the
board connectors. If these are inserted correctly,
the problem could be a bad LCD inverter board or a
component failure.
Vission 20/20 boots up but all data Check analog board jumpers to insure proper node addresses are set up
temperatures and pressures are ze- on all boards. Physically inspect power and communication jumper ca-
roed and do not update.
bles to insure they are inserted properly and completely. Two LEDs on all
boards show the status of the communications for the board. LED1 is on
when a command is received at the board from the single board computer
(SBC), and LED2 is on when a response is sent from the board to the SBC.
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
A - 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
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35391SC 1.9 (1/13) Emerson and Vilter are trademarks of Emerson Electric Co. or one of its affiliated companies. © 2012 Emerson Climate Technologies, Inc. All rights reserved. Printed in the USA.
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