AC Power
For Business-Critical Continuity™
Liebert® STS2™
User Manual–100-1000A, 50/60Hz
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TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
OVERVIEW OF MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
UNPACKING AND INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
External Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unloading and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2.1 Handling Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.2 Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Internal Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LOCATION CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Recommended Minimum Service Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Heat Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LOCATING THE LIEBERT STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Leveling and Anchoring the Unit to the Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Leveling of the Static Switch Without Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Leveling and Anchoring the Static Switch Using Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . 8
POWER AND CONTROL WIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Input And Output Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Input Junction Box Installation—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
System Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Control Wiring Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Remote Source Selection Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.6
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Programmable Relay Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Optimized Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Distribution Cabinet With I-Line Panelboard—100-600A Units Only . . . . . . . . . . . . . . . . . 15
Input Contact Isolator Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Comms Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Liebert IntelliSlot® SNMP/Web/Modbus 485 Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Remote Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Key Lockout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.10 Redundant Output Breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.11 Transfer Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.12 Input Junction Boxes and Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.13 Seismic Floor Anchors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.14 Seismic Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
INTRODUCTION TO LIEBERT STS2 OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.1.1 Redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.1.2 Reliability and Agency Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.1.3 Factory Backup and Service Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.2.1 Normal (Preferred Source). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.2.2 Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.2.3 Transfer Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.2.4 Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Operator Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.1.1 Liebert STS2 Static Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.1.2 Source Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.1.3 Automatic Transfer/Retransfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
9.1.4 Emergency Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.1.5 Load Current Transfer Inhibit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.1.6 SCR Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.1.7 On/Off Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Detailed Component Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.2.1 Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
9.2.2 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.2.3 SCRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.2.4 Logic Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.2.5 Audible Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9.2.6 RS-232 Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
10.1 Normal System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
10.2 Manual Transfer / Preferred Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
10.3 Enabling Remote Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.4 Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.4.1 Bypass Procedures for Source 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
10.4.2 Bypass Procedures for Source 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.5 Normal System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.5.1 Shutdown in Static Transfer Switch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
10.5.2 Shutdown in Maintenance Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
11.0 ALARM AND FAULTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
11.1 Event Mask. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
11.2 Event and History Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
11.2.1 Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
11.2.2 History Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
11.3 Alarm Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
11.4 List of Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
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12.0 COMMUNICATION INTERFACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
12.1 Using the RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
12.1.1 Connecting and Using a Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
12.1.2 Configuring the Liebert STS2 via the Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
12.1.3 Setting Bitpacked Options with the Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
12.1.4 Setting Event Masks with the Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
13.0 LIEBERT STS2 TOUCH SCREEN DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
13.1 Display Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
13.2 Menu Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
13.2.1 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
13.3 Mimic Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.4 Event Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.5 Event Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.6 Menu Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.7 Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.7.1 System Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.7.2 Event Masks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
13.7.3 User Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
13.7.4 System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
13.8 Comm Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
13.8.1 Configuring the Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
13.8.2 Configuring Pager Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
13.8.3 Configuring the Input Contact Isolator Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
13.8.4 Configuring the Programmable Relay Board Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
13.8.5 Configuring the Liebert IntelliSlot SNMP/Web/Modbus 485 Card . . . . . . . . . . . . . . . . . . . . . 98
13.8.6 Liebert SiteScan® Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
13.8.7 Saving Your Communications Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
13.9 System Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
13.10 System ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
13.11 Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
13.11.1 Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
13.11.2 History Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
13.12 Source Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
13.13 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
13.14 Bypass Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
13.15 Help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
13.16 Logo. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
13.17 Cleaning the LCD Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
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14.0 OPERATING THE LIEBERT STS2 LED DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
14.1 LEDs and Buttons and Key Lockout Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
14.1.1 Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
14.1.2 LED and Push Button Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
14.1.3 Event Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
14.1.4 Key Lockout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
14.2 Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
14.2.1 Normal System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
14.2.2 Manual Transfer / Preferred Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
14.2.3 Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
14.2.4 Normal System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
15.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
15.1 System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
15.1.1 Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
15.1.2 Input/Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
15.1.3 System Current Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
15.1.4 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
15.1.5 Electrical Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
15.1.6 Input Surge Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
15.1.7 Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
15.1.8 Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
15.2 System Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
15.2.1 Frame and Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
15.2.2 Casters, Leveling and Seismic Anchoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
15.2.3 Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
15.2.4 Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
15.2.5 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
15.2.6 Cable Entrance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
15.2.7 Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
15.2.8 Color Graphical Display or LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
15.2.9 RS-232 Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
15.2.10 Terminal Port Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
15.2.11 RS-232 Interface Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
15.2.12 Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
15.2.13 Fuseless Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
15.2.14 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
16.0 EVENT MESSAGE HELP TEXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
17.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
17.1 Proper Tightening of Nuts and Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
17.2 Testing the Liebert STS2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
17.3 Changing the Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
SUPPORT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
PROGRAMMABLE RELAY BOARD SETTINGS RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
INPUT CONTACT ISOLATOR SETTINGS RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142
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FIGURES
Figure 1
Recommended derating for high altitude operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maximum ambient temperature for full load operation at higher altitudes. . . . . . . . . . . . . . . . . . 7
Typical static transfer switch one-line diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical one-line diagram of two PDUs and a Liebert STS2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Outline drawing: 100 – 250 amp Liebert STS2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Outline drawing: 400 – 600 amp Liebert STS2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Outline drawing: 800 – 1000 amp Liebert STS2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Outline drawing: 100 – 250amp Liebert STS2 with a key lockout switch option . . . . . . . . . . . . . 21
Outline drawing: 400 – 600 amp Liebert STS2 with a key lockout switch option . . . . . . . . . . . . 22
Figure 10 Outline drawing: 800 – 1000 amp Liebert STS2 with the key lockout switch option. . . . . . . . . . 23
Figure 11 Seismic anchor drawing: 100 – 250 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 12 Seismic anchor drawing: 400 – 600 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 13 Seismic anchor drawing: 800 – 1000 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 14 Electrical field connections drawing: 100 – 250 amp Liebert STS2 with single output breaker . 27
Figure 15 Electrical field connections drawing: 100 – 250 amp Liebert STS2 with dual output breakers . 28
Figure 16 Electrical field connections drawing: 400 – 600 amp Liebert STS2 with single output breaker . 29
Figure 17 Electrical field connections drawing: 400 – 600 amp Liebert STS2 with dual output breakers . 30
Figure 18 Electrical field connections drawing: 800 – 1000 amp Liebert STS2 with single output breaker 31
Figure 19 Electrical field connections: 800 – 1000 amp Liebert STS2 with dual output breakers. . . . . . . . 32
Figure 20 Liebert STS2 non-automatic circuit breaker schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 21 Control connection location diagram: 100 – 600 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 22 Control connection location diagram: 800 – 1000 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . 35
Figure 23 Control wiring for remote source selection option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 24 Control wiring for the programmable relay board option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 25 Control wiring for the input contact isolator board option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 26 Control wiring for comms board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 27 Control wiring for the Liebert IntelliSlot SNMP/Web/Modbus 485 card. . . . . . . . . . . . . . . . . . . . 40
Figure 28 Control wiring for the RS-232 port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 29 Outline drawing for input junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 30 Color LCD touch screen display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 31 LED display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 32 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 33 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 34 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 35 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 36 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 37 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 38 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 39 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 40 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 41 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 42 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 43 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 44 Liebert STS2 touch screen display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Figure 45 Liebert STS2 touch screen display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Figure 46 Source transfer screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 47 Gate board viewing slot locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 48 Liebert STS2 touch screen display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Figure 49 Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 50 Keyboard and keypad displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Figure 51 Key lockout switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Figure 52 Event mask dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
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Figure 53 User settings dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Figure 54 Source setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Figure 55 Comm options dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Figure 56 Modem dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Figure 57 Input contact isolator dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Figure 58 Programmable relay board dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Figure 59 System options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure 60 Event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Figure 61 History log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Figure 62 LED display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Figure 63 Key lockout switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
TABLES
Heat output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Input/output conduit plate specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Input junction box dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Input junction box terminal wire size range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Remote source selection terminal block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminal block 1 and terminal block 2 wire connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Programmable relay board pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Event messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Terminal commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 10 Value types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 11 Group settings and values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Table 12 Binary-hexadecimal conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Table 13 Sepoint parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Table 14 Standard settings for programmable relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Table 15 LED and push button description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Table 16 Input/output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Table 17 System current ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Table 18 Electrical requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Table 19 Unit short circuit withstand capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Table 20 Frame sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Table 21 MTA plug pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Table 22 DB9 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Table 23 RS-232 settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Table 24 Torque tightening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during the installation and
maintenance of the Liebert STS2.
WARNING
!
The unit is supplied by more than one power source. The unit contains hazardous voltages if
any of the input sources are ON, even when the unit is in bypass. To isolate the unit, turn
OFF and lock out ALL input power sources.
Verify that all input power sources are de-energized and locked out before making connections
inside unit.
Lethal voltages exist inside the unit during normal operation. Only qualified service
personnel should perform maintenance on the static switch.
NOTE
Read the entire manual before installing or operating the system. Adhere to all operating
instructions and warnings on the unit and in this manual.
Emerson Network Power neither recommends nor knowingly sells this product for use with life
support or other FDA-designated “critical” devices.
The Liebert STS2 is suitable for indoor use only. Protect the unit from excessive moisture and
install the unit in an area free from flammable liquids, gases, or corrosive substances.
The unit is designed to operate from solidly grounded AC power sources only. Provide input
over-current protection in accordance with the unit ratings. Wire and ground the unit
according to national and local electrical safety codes. All wiring should be installed by a
qualified electrician.
Before unit is placed into service for the first time, after equipment relocation, or after the unit
has been de-energized for an extended period of time, a thorough equipment inspection and
supervised startup by qualified service personnel are strongly recommended.
CAUTION
!
This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J
of the FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates, uses and radiates radio frequency energy and,
if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. Operation of this unit in a residential area may cause
harmful interference that the user must correct at his own expense.
WARNING
!
Locate the center of gravity symbols
cabinet.
and determine the unit’s weight before handling the
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OVERVIEW OF MANUAL
The Liebert STS2 Installation, Operation and Maintenance Manual is organized in a logical
progression so that you can follow the procedures in the order provided to get your Liebert STS2
installed and running.
Read the entire manual before proceeding with the unpacking and installation of the Liebert STS2.
The major sections are as follows:
Important Safety Instructions—review the instructions on the previous page before proceeding.
Support Information—a blank table in which you can enter pertinent data, such as the serial and
part numbers, needed when calling Emerson for technical support.
Programmable Relay Board Settings Record—a blank table in which you can document your
Programmable Relay Board settings.
Input Contact Isolator Settings Record—a blank table in which you can document your Input
Contact Isolator settings.
1.0 - Safety Precautions—provides safety warnings that you must review before proceeding.
2.0 - Unpacking and Inspections—provides instructions for inspecting, unloading, handling and
removing the Liebert STS2 from the shipping pallet.
3.0 - Location Considerations—provides information regarding environmental considerations for
where the Liebert STS2 is installed.
4.0 - Locating the Liebert STS2—provides instructions for leveling the Liebert STS2 and
anchoring the unit to the floor, should that be required.
5.0 - Power and Control Wiring—provides instructions wiring the Liebert STS2 for power and
control connections.
6.0 - Options—lists the options available for the Liebert STS2.
7.0 - Installation Drawings—provides outline, seismic and electrical field connection drawings
required for installing the Liebert STS2.
8.0 - Introduction to Liebert STS2 Operations—provides a system description.
9.0 - Theory of Operation—provides an overview of how the unit works, plus a brief overview of
some of the components.
10.0 - Operating Instructions for the Touch Screen Interface—provides instructions for
turning the system on and off, completing a maintenance bypass and selecting a preferred source.
11.0 - Alarm and Faults—provides a list of event messages.
12.0 - Communication Interfaces—discusses the communication ports and provides a list of
terminal and modem commands.
13.0 - Liebert STS2 Touch Screen Display—provides instructions for using the HMI touch screen
interface for monitoring and managing the Liebert STS2.
14.0 - Operating the Liebert STS2 LED Display—provides instructions for operating the LED
Display unit without the touch screen display.
15.0 - Specifications—provides specifications for the Liebert STS2.
16.0 - Event Message Help Text—provides the help text for the various system event messages.
This help is also available through the touch screen interface.
17.0 - Maintenance—briefly discusses routine maintenance, provides proper torque settings for nuts
and bolts, and provides the Emerson contact information for technical support.
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Safety Precautions
1.0 SAFETY PRECAUTIONS
Read this manual thoroughly before working with the Liebert STS2.
Under typical operation and with the doors closed, only normal safety precautions are necessary. The
area around the Liebert STS2 should be kept free from puddles of water, excess moisture and debris.
The vent grate in the front of the system should not be obstructed in order to ensure a smooth air flow
through the unit for cooling.
ONLY qualified service personnel should perform maintenance on the Liebert STS2. When
performing maintenance on any part of the equipment under power, service personnel and test
equipment should be located on rubber mats. The service personnel should wear insulating shoes for
isolation from direct contact with the floor.
Unless all power is removed from the input sources to the unit, one person should never work alone. A
second person should be on hand to assist and summon help, should an accident occur.
Three types of messages are used throughout this manual to stress important text. Carefully read the
information below each Warning, Caution and Note and use professional skills and prudent care
when performing the actions described in that text.
A Warning indicates the presence of a possible serious, life-threatening condition. For example:
WARNING
!
The unit is supplied by more than one power source. The Unit contains hazardous voltages if
any of the input sources is ON, even when the unit is in bypass. To isolate the unit, turn OFF
and lock out ALL input power sources.
Verify that all input power sources are de-energized and locked out before making connections
inside unit.
Lethal voltages exist inside the unit during normal operation. only qualified service personnel
should perform maintenance on the static switch.
A Caution indicates a condition that could seriously damage the equipment and possibly injure
personnel. For example:
CAUTION
!
Risk of unit damage
The input sources to the static switch must be grounded-wye sources. input sources other
than solidly grounded-wye sources may cause damage to the switch.
A Note emphasizes important text. If the instructions are not properly followed, the equipment could
be damaged or may not properly operate. For example:
NOTE
Read this entire manual before installing and operating the unit.
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Unpacking and Inspections
2.0 UNPACKING AND INSPECTIONS
NOTE
Read the entire manual before installing and operating the unit. Upon receipt of the Liebert
STS2, the installer should perform the following steps to assure a high-quality installation.
A high-quality installation begins on the receiving dock. The Liebert STS2 and its packaging should
be inspected when the unit is delivered. If the packaging is not damaged, unpack the unit and conduct
an internal inspection before beginning the installation process. This section discusses the inspecting
and unpacking of the Liebert STS2.
2.1
External Inspections
1. While the Liebert STS2 is still on the truck, inspect the equipment and shipping container(s) for
any signs of damage or mishandling. Do not attempt to install the system if damage is apparent.
2. Upon receipt and before unpacking, inspect the shipping crate for damage or mishandling. Check
the Shock-Watch™ indicator.
• If the indicator is red, note on shipper’s receipt and check for concealed damage.
• If any damage as a result of shipping is observed, file a damage claim with the shipper within
24 hours and contact Emerson Network Power Liebert Services at 1-800-543-2378 or your
local Emerson representative to inform them of the damage claim and the condition of the
equipment.
3. Locate the bag containing the keys for the front access door. The bag is attached to the cabinet.
4. Compare the contents of the shipment with the bill of lading. Report any missing items to the
carrier and to Liebert Services immediately.
5. Check the nameplate on the cabinets to verify that the model numbers correspond with the one
specified. Record the model numbers and serial numbers in the front of this installation manual.
A record of this information is necessary should servicing be required.
6. If unit is to be stored before installation, it is recommended to store the unit in a dry environment
with temperatures in the range of -40°F (-40°C) to 176°F (80°C). Use original packing materials or
other suitable means to keep the unit clean. When opening the shipping crate, use care not to
puncture the container with sharp objects.
2.2
Unloading and Handling
CAUTION
!
Risk of unit damage.
When moving the unit by forklift, lift the unit from the rear so as to protect the front panel.
Do not exceed a 15 degree tilt with the forklift.
Also, if you are moving the unit by forklift or pallet jack after it has been removed from the
pallet, be aware of the location of the casters and leveling feet so as not to damage them.
Most Liebert STS2 models are contained in one cabinet. The 800–1000 amp units are contained in two
cabinets that are connected together and shipped on one pallet.
Because the weight distribution in the cabinet is uneven, use extreme care during handling and
transporting.
The unit can be moved by forklift or pallet jack.
pallet.
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Unpacking and Inspections
2.2.1 Handling Considerations
The static switch is bolted to a wooden shipping pallet to allow handling by forklift equipment or a
pallet jack.
Easily Moved — The unit is furnished with integral castors that allow the unit to be rolled into place
after it has reached its location and is removed from the pallet.
WARNING
injury to personnel.
!
Exercise extreme care when handling static switch cabinets to avoid equipment damage or
The cabinet can be safely tilted 15 degrees in any direction by forklift.
If moving the unit up a ramp on its casters or a pallet jack, ensure that the incline does not
exceed fifteen (15) degrees.
Locate the center of gravity symbols
cabinet.
and determine the unit’s weight before handling the
Check the unit size and weight — Refer to the cabinet drawings furnished with the unit for size
100-250 amp
400-600 amp
800-1000 amp
780 lb. (354 kg)
1200 lb. (544 kg)
2500 lb. (1134 kg)
Plan the route — Review the route over which the unit will be transported to its installation
location to ensure that all passages are large enough to accommodate the unit and support the
weight. Check for any non-negotiable corners or offsets in hallways. Before moving the unit to the
2.2.2 Unit Preparation
The unit can be removed from the pallet before it is moved to its location.
Complete the following steps to properly remove the Liebert STS2 from the shipping
pallet:
1. Set the pallet in a level area with enough room to maneuver and remove the unit.
2. Remove the bolts holding the unit to the shipping pallet (located in the base of the unit).
3. Remove the shipping blocks from under the frame of the unit.
4. Use a forklift to raise the unit off the pallet and onto the floor. Ensure that the forklift is clear of
the unit’s casters and leveling feet. Lift the unit from the rear.
5. Conduct an internal inspection of the unit. See the list below of inspection items.
2.3
Internal Inspections
After the Liebert STS2 has been unpacked, conduct an internal inspection:
1. Verify that all items have been received.
2. If spare parts were ordered, verify their arrival.
3. After the Liebert STS2 has been removed from the pallet, open the door and remove cabinet
panels to check for shipping damage to internal components.
4. Check for loose connections or unsecured components in the cabinet(s).
5. Check for any unsafe condition that may be a potential safety hazard.
After the Liebert STS2 has been inspected and no problems are found, the unit can be moved to its
installation location. If using a forklift, remember to lift the unit from the rear.
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Location Considerations
3.0 LOCATION CONSIDERATIONS
The Liebert STS2 should be placed in a clean, cool and dry location. The Liebert STS2 requires only
front access for installation and maintenance. Back or side access is not required. Adequate space is
required above the unit for conduit (if configured as such) and cooling air flow. This section provides
specific information for these considerations.
The unit is designed with top and bottom cable terminations to allow maximum flexibility in its
installation. If bottom cable entry is used, sufficient cable bending space must be provided by a raised
floor or a floor stand.
location of that switch.
3.1
3.2
Recommended Minimum Service Clearances
The recommended service clearances are at the front of the unit. The minimum service clearance
required by the National Electrical Code (NEC) Article 110-26 is 36 in. (91 cm) for units with voltages
up to 150V to ground and 42 in. (107 cm) for units with voltages over 150V to ground. Clearance of at
least 18 in. (46 cm) is required above the unit for cooling air flow.
Heat Output
The unit produces minimal heat during normal operation.
Table 1
Heat output
Heat Output
BTU/Hr (kW)
Switch Size
100 amp
250 amp
400 amp
600 amp
800 amp
1000 amp
2,711 (0.80)
4,680 (1.37)
6,972 (2.04)
10,520 (3.08)
13,777 (4.03)
17,390 (5.09)
3.3
Operating Environment
The unit is designed to be installed indoors under the following environmental conditions:
• Storage Temperature Range: -40° to +80°C (-40° to 176°F).
• Operating Temperature Range: 0° to 40°C (32° to 104°F).
• Relative Humidity: 0 to 95% without condensation.
• Operating Altitude: Up to 4000 ft. (1200m) above sea level without derating.
Above 4000 ft. (1200m), output current is derated by 6% per 1000 ft. (18% per 1000m).
• Storage/Transport Altitude: Up to 40,000 ft. (12,200m) above sea level.
• Audible Noise: Less than 55 dBA at 5 ft. (1.5m) with audible alarm off.
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Location Considerations
3.4
Altitude
The standard units are designed for full load operation up to 4000 feet (1200m) above sea level. See
Figure 1 for recommended deratings for altitudes greater than 4000 feet (1200m).
Figure 1 Recommended derating for high altitude operation
100
98
96
94
92
90
88
86
Altitude, Feet(M) Above Sea Level
Operation at full load at a higher altitude can be accommodated in ambient temperatures less than
operation at altitudes above 4000 feet (1200 m).
Figure 2 Maximum ambient temperature for full load operation at higher altitudes
104.0 (40)
102.2 (39)
100.4 (38)
98.6 (37)
96.8 (36)
95.0 (35)
93.2 (34)
94.1 (33)
89.6 (32)
87.8 (31)
86.0 (30)
Altitude, Feet (M) Above Sea Level
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Locating the Liebert STS2
4.0 LOCATING THE LIEBERT STS2
This section provides instructions for leveling the Liebert STS2 and anchoring the unit to the floor,
should that be required.
4.1
Leveling and Anchoring the Unit to the Floor
The Liebert STS2 can be anchored to the concrete floor to ensure stability for the unit in the event of
seismic activity.
The seismic brackets are an option for the Liebert STS2 and are shipped separately from the unit
when ordered.
4.2
4.3
Leveling of the Static Switch Without Anchoring
The Liebert STS2 is furnished with casters and leveling feet. After final positioning of the unit, adjust
the leveling feet located in each corner of the frame base to level and stabilize the unit.
Leveling and Anchoring the Static Switch Using Floor Stand
The Liebert STS2 can be installed using the optional floor stand to support the unit instead of using
the raised floor. The Liebert STS2 can be rolled or placed using a lift on to the floor stand.
After final positioning of the unit, adjust the leveling feet located in each corner of the frame base to
level and stabilize the unit.
The floor stand can also be used to ensure the unit’s stability in the event of seismic activity by
anchoring the Liebert STS2 to the floor stand and to the concrete floor.
The seismic floor stand is shipped separately from the unit when ordered.
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Power and Control Wiring
5.0 POWER AND CONTROL WIRING
All power and control wiring should be installed by a qualified electrician. All power and control
wiring must comply with the NEC and applicable local codes. Unless otherwise labeled, use the
recommended tightening torque as shown in Table 24 - Torque tightening.
The busbars are accessible through the front of the Liebert STS2 and designed to allow one-handed
tightening.
Cables can be installed through the top or bottom of the unit through removable conduits plates.
Input wiring also can be installed under a raised floor to optional input junction boxes and cables,
when used.
5.1
Input And Output Power Connections
If the unit is furnished with input junction boxes, the input power connections are made to the input
power terminals located in the junction boxes. Input power cables, furnished with the input junction
boxes, are shipped unattached to the unit for connection between the junction boxes and the bus bars
provided inside the unit. Input junction box installation is discussed in 5.2 - Input Junction Box
If input junction boxes are not furnished, the input power connections are made to the bus bars
provided inside the unit. These bus bars are accessible through the front of the unit.
Output power connections also are made to the bus bars provided inside the unit. These bus bars are
WARNING
!
Risk of electric shock
Verify that all input power and control circuits are de-energized and locked out before making
connections inside unit.
The two input power feeds (sources) to the Liebert STS2 should be from two independent sources to
avoid a common source failure.
To ensure proper operation of the Liebert STS2, the two input sources must be the same nominal
voltage level and phase rotation.
For uninterrupted automatic transfer, the two input sources should be synchronized within 15 degrees.
CAUTION
!
Risk of unit damage.
The input sources to the static switch must be grounded-wye sources. Input sources other
than solidly grounded-wye sources may cause damage to the switch.
The Liebert STS2 is designed for operation with 3- or 4-wire, solidly grounded sources only.
For 4-wire operation, the common source neutral must be connected to the Liebert STS2. See
connections on all units, with both single and dual output breakers.
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Power and Control Wiring
Figure 3 Typical static transfer switch one-line diagram
SOURCE 2
SOURCE 1
STS1
STS2
CB1
K1
CB2
K2
CB3
K2 K3
CB4
K1 K3
CB5
OUTPUT
The input and output power wire size should be based on the upstream overcurrent protection device,
observing the NEC and local codes.
The molded case switches contained in the Liebert STS2 are typically non-automatic circuit breakers
that rely on the upstream and/or load overcurrent protection. Upstream overcurrent protection
should be rated equal to or less than the rating of the Liebert STS2 molded case switches.
The Liebert STS2 input and output power and ground and neutral bus bars accommodate a wide
range of wire sizes. The Liebert STS2 bus bars accommodates standard 2 hole lugs.
Table 2
Input/output conduit plate specifications
Max. number and size
Rating
100-250A
400-600A
800-1000A
6 — 3" conduit
9 — 4" conduit
12 — 4" conduits
5.2
Input Junction Box Installation—Optional
The input junction box option is available to simplify input connections to the Liebert STS2. Two
input junction boxes and the associated flexible 10 foot long (3 meter) input cables are provided with
this option.
This option is available only with bottom cable entrance, typically when the unit is located on a raised
floor.
If the input junction boxes will be used, they may be shipped either with the unit or in advance to be
installed during the rough-in stage of construction.
Locate the junction boxes a maximum of 8 feet (2.4 meters) from the planned location of the Liebert
STS2.
Due to a lack of clearance for the cables below the unit, the cables are also shipped loose from the unit
for installation at the site. The input cables connect from the input junction boxes to the input power
bus bars inside the Liebert STS2.
The standard configuration for the input junction boxes and cables is for 3-wire-plus-ground feeds. If
the input neutral is required, special 4-wire-plus-ground input cables and junction boxes are required.
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Power and Control Wiring
For preparation purposes, the following tables provide the dimensions and wire sizes for the input
junction boxes.
Table 3
Input junction box dimensions
Length Width Height
Inches (mm) Inches (mm) Inches (mm)
Switch Rating
100 amp
16 (406)
30 (762)
14 (356)
16 (406)
6 (152)
6 (152)
250 to 600 amp
Table 4
Switch Rating
100 amp
250 to 600 amp
Input junction box terminal wire size range
Power and Ground Lug Wire Range
#6 to #2/0 AWG
(2) #6 AWG to (2) 500 kcmil
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Power and Control Wiring
5.3
System Grounding
Equipment grounding — Grounding is primarily for equipment and personnel safety, although
proper grounding also enhances equipment performance.
All input and output power feeds must include an equipment grounding means as required by the
NEC and local codes.
An insulated equipment ground conductor is recommended to run with each input and output power
feed. The equipment ground conductors should be at least the minimum size conductor per the NEC
based on the upstream overcurrent protection device.
WARNING
!
If conduit is used as a grounding means, adequate electrical continuity must be maintained at
all conduit connections. The use of isolating bushings with a metal conduit can be a safety
hazard and is not recommended.
4-Wire-Plus-Ground Systems — When 4-wire-plus-ground input feeds are utilized, the input power
sources must be properly grounded. Because the neutral is not switched by the Liebert STS2, the
neutrals of the two power sources are solidly interconnected. The NEC prohibits grounding a power
source at more than one point. Connecting the neutrals of two grounded power sources together
effectively grounds each of the sources at more than one point, which allows neutral current to flow on
the ground system, defeats ground fault protection, creates a safety hazard, and violates the NEC.
Where possible, the two power sources should be located in close proximity and a single
ended substation).
Figure 4 Typical one-line diagram of two PDUs and a Liebert STS2
SOURCE 1
SOURCE 2
MICB1
MICB2
ISOLATION
TRANSFORMER
ISOLATION
TRANSFORMER
STS2
CB3
STS1
CB1
K1
CB2
K2
K2 K3
225A
CB4
K1 K3
CB5
225A
225A
225A
225A
225A
5.4
Control Wiring Connections
No control wiring is needed on the standard Liebert STS2. Only certain options require external
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Power and Control Wiring
5.5
Remote Source Selection Wiring
An optional Remote Source Selection board may be installed in your Liebert STS2. This board is
option.
The Remote Source Selection allows you choose the preferred input source from a remote location.
Terminal connections allow the customer to remotely select a source to be the preferred source in the
same process as the local source transfer selection.
The unit’s preferred source selection and Remote Source Selection are active at the same time, with
the Liebert STS2 following the last request for a preferred source change, regardless of whether it
was from the local or Remote Source Selection controls.
A six pin terminal block provides the Remote Source Selection connections. Two pairs of wires are
used from the switch to trigger the source selection. You can select the type of switch used for this
remote control. Connections are made to four of the connections, using Form A dry contacts. The
contacts are numbered left to right:
Table 5
Contact
Remote source selection terminal block
Connection
Source 1
1
2
3
4
5
6
Isolated ground
Source 2
Isolated Ground
DO NOT USE
DO NOT USE
Selection option.
5.6
Power Supply
The Liebert STS2 is supplied with redundant power supplies that are designed to operate from a
voltage range of 200V to 600V. The unit is set at the factory to match the nameplate voltage. Field
adjustments are not necessary. If the unit needs to operate at a voltage other than what is listed on
transformer tap information.
Table 6
Terminal block 1 and terminal block 2 wire connections
Connect t Connect
F1
TB1-XX
F2
TB1-YY
F3
TB2-XX
F4
TB2-YY
Jumper
Between
Voltage
200
208
220
240
380
400
415
480
600
1
1
2
1
1
1
1
1
1
9
1
1
2
1
1
1
1
1
1
9
1-7
1-7
6-8
1-7
2-7
3-7
4-7
5-7
6-7
10
12
11
8
10
12
11
8
9
9
10
11
12
10
11
12
CAUTION
for the unit.
!
Improper wiring could result in blown fuses.
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Options
6.0 OPTIONS
This section discusses the options available for the Liebert STS2. The communications options are
6.1
Programmable Relay Board
The Programmable Relay Board (PRB) provides a means to trigger an external device when an event
occurs in the Liebert STS2. Each PRB has eight channels. Each channel has two sets of Form-C dry
contacts, rated 1 Amp @ 30 VDC or 250 mAmp @ 125VAC.
Any alarm/event can be programmed to any channel or channels. Up to ten (10) events can be
programmed to a relay. If multiple events are grouped to one relay, group the events logically to
simplify troubleshooting when an event is triggered. The same alarm/event can be programmed to
more than one channel. Up to two Programmable Relay Boards can be installed in the Liebert STS2
for a total of 16 channels. Programming is performed through the touch screen display.
Table 7
TB1
Programmable relay board pinout
Channel
Pin No.
1-3
C
1
N.C.
2
N.O.
3
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
CH1
4-6
4
5
6
7-9
7
8
9
CH2
CH3
CH4
CH5
CH6
CH7
CH8
10-12
13-15
1-3
10
13
1
11
14
2
12
15
3
4-6
4
5
6
TB2
7-9
7
8
9
10-12
13-15
1-3
10
13
1
11
14
2
12
15
3
4-6
4
5
6
TB3
TB4
7-9
7
8
9
10-12
13-15
1-3
10
13
1
11
14
2
12
15
3
Key: N.O. = Normally Open; N/C. = Normally Closed; C = Common
Note: Pin 16 not used on TB1, TB2, and TB3.
6.2
Optimized Transfer
When the Liebert STS2 is used as a primary-side switch—on the primary of an isolation
transformer—optimized transfer greatly reduces the transformer magnetization current during
automatic transfers through a new transfer control algorithm. The Liebert algorithm optimizes the
transfer timing so that the volt-seconds applied to the downstream transformer primary is balanced,
minimizing peak saturation current.
The volt-second balance is achieved by directly computing the volt-second applied to the transformer
during transfer events and determining the optimum time to turn on the alternate source SCRs in
order to balance the volt-second within specified tolerance.
Optimized transfer also seeks to minimize the voltage disturbances while still maintaining
transformer flux balance. This unique flux balance algorithm does not just wait for the balance point
to occur, but will pulse fire the SCRs as soon as possible to minimize the voltage disruption. This
results in far superior voltage waveforms applied to the load.
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Options
6.3
6.4
Distribution Cabinet With I-Line Panelboard—100-600A Units Only
A distribution cabinet with a Square D I-Line panelboard offers space to plug in up to 10 three-pole
branch circuit breakers (100A-250A). The panelboard is rated at 600A with an overall short-circuit
rating of 100,000 AIC.
The full-height cabinet mounts on either the right or left side of the Liebert STS2 and is fully enclosed
with a keylock door and an accent cover that permits access to the panelboard without exposing other
portions of the Liebert STS2.
Input Contact Isolator Board
The Input Contact Isolator Board (ICI) provides an Liebert STS2 module interface for up to eight
external user alarm or message inputs to be routed through the Liebert STS2’s alarm network. The
eight contacts are normally open dry contacts. When a contact closes, an event is triggered.
The Input Contact Isolator options are configured through the Input Contact Isolator dialog box,
which is accessed from the Comm Option dialog box on the touch screen display. You also can
program the alarm messages through this dialog box. See Configuring the Input Contact Isolator
Settings on page 96 for instructions on configuring the connections.
6.5
Comms Board
The Comms Board provides a communication interface to Liebert SiteScan, a site monitoring product
and/or an external modem. Liebert SiteLink™-12 or Liebert SiteLink-4 is required for Liebert
SiteScan to communicate with the Liebert STS2.
The Comms Board is equipped with an RS-422 communication port for communication to a Liebert
SiteScan monitoring system using a 2-wire twisted pair for reliable communication up to 1000 meters
(3281 feet). Information available from the RS-422 port includes the present switch status
information, all monitoring parameters, and all active alarms.
The Comms Board is equipped with a modem interface for remote reporting of the present switch
status information, alarm history information, and the history of status screens that are triggered
upon a major alarm event. The monitoring system software also supports an auto-dial feature that
allows the system to automatically dial programmed phone numbers by way of the modem to report
designated alarm conditions.
Programming the Comms Board is performed through the touch screen display. See Comm
Options on page 93 for details.
6.6
Liebert IntelliSlot® SNMP/Web/Modbus 485 Card
A Liebert IntelliSlot SNMP/Web/Modbus 485 card enables the Liebert STS2 to communicate to a
network management system (NMS). The card provides the internal hardware and software to
communicate, via SNMP/Web (HTTP), to any IP-based Ethernet network through an RJ-45 connector
using Category 5 cabling.
The Liebert SNMP/Web/Modbus 485 card provides redundant paths for communications that make it
possible to connect to a Building Management System (BMS) using Modbus, while simultaneously
communicating to a NMS through SNMP/Web (HTTP). A terminal block provides the connection to
Modbus.
control wiring information.
If you have questions about the Liebert SNMP/Web/Modbus 485 card, refer to the user guide,
SL-52615, available at the Liebert Web site, www.liebert.com
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Options
6.7
6.8
LED Display
A light-emitting diode display is available to replace the standard liquid crystal display touch screen
control. The display provides monitoring and control throuh a series of LEDs and buttons. LEDs alert
you when a problem occurs. A PC running terminal emulation software connected to the RS-232 port
is needed to access the data and configuration settings.
Remote Source Selection
The Remote Source Selection allows the preferred input source to be chosen from a remote location. A
user supplied normally open dry contact allows the user to remotely select a source to be the preferred
source in the same process as the local source transfer selection.
The unit’s preferred source selection and Remote Source Selection are active at the same time, with
the Liebert STS2 following the last request for a preferred source change, regardless of whether it
was from the local or Remote Source Selection controls.
Selection.
control wiring.
6.9
Key Lockout Switch
The key lockout switch activates a software lockout of the touch screen display to prevent manual
transfers and configuration changes. When locked out, the touch screen becomes a read only display.
A key is needed to do manual transfers or change settings.
The alarm silence button is not disabled when in the lockout position.
The switch is located behind the front door but can be operated without opening the front door. See
6.10 Redundant Output Breaker
An output plug-in, non-automatic circuit breaker is provided which allows redundancy in the output
power path. The breaker is connected in parallel with the output plug-in non-automatic circuit
breaker.
6.11 Transfer Inhibit
Transfer Inhibit prevents the Liebert STS2 from transferring under certain conditions. When a
customer-supplied closed dry contact is provided, the Liebert STS2 will not transfer and remain on its
present source even if the source is no longer supplying power.
16
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Options
6.12 Input Junction Boxes and Cables
Two input power junction boxes and interconnecting cables provide under floor connection for the two
input power feeds. Power terminal blocks are provided in each junction box for the connection of the
input power conductors and a parity-sized ground conductor. The junction boxes are NEMA 1
enclosures. A main input cable assembly is provided for connection between the unit and the junction
box. The cable length between the unit and junction box is 10 feet (3 meters) long.
6.13 Seismic Floor Anchors
Seismic anchors are available for anchoring the unit to a concrete floor to meet seismic Zone 4
6.14 Seismic Floor Stand
Seismic floor stands in four heights—18", 24", 30" and 36" (457mm, 610mm, 762mm and 914mm)—
are available for the Liebert STS2. The stands can be fastened to the floor to meet seismic Zone 4
details for installing seismic floor stands.
17
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Installation Drawings
7.0 INSTALLATION DRAWINGS
Figure 5 Outline drawing: 100 – 250 amp Liebert STS2
32.1"
(815)
30"
(762)
Center
Of Gravity
Center
Of Gravity
77"
(1956)
36.7"
(932)
18.8
(477)
19.2"
(488)
23.4" (594)
Caster Centers
11.1
24.4"
(620)
8.4 (213)
(280)
4.6 (116)
9.4 (238)
13.5" (343)
29" (736)
(12mm centers)
21.6"
(548)
12.8" (326)
Caster
Centers
21.5 (546)
.47" (12)
centers
24.4
(619)
5.1
(130)
29.8"
(756)
Notes:
1. All dimensions are in inches and (millimeters).
2. 18" (457mm) min. clearance above unit required for air exhaust.
3. Clearance of 36" (914mm) minimum is required in the front for
installation and service access.
2.75"
(69.8) typ.
.47" (12) dia.
threaded mounting
hole; 4 typ.
4. Heat output: 2710 btu/hr (0.80 kW/hr) max. for 100A switch.
4680 btu/hr (1.37 kW/hr) max. for 250A switch.
5. Weight: 780 lb. (354 kg)
6. Unit bottom is structurally adequate for forklift handling.
7. Keep cabinet within 15 degrees of vertical while handling.
8. Color - IBM off-white.
see Note 10
Leveler
DETAIL A
Front of Unit Without Side Panel
9. Open door to replace air filter, disposable type, size 1x25x25.
10.Threaded mounting holes (see detail a) are provided for seismic
anchoring or floor stand. Mounting bolts must be threaded into
the unit mounting holes from underneath the unit base. If floor
stand is used, the casters must rest on the floor stand to support
the weight of the unit.
PS211100
Rev. 03
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Installation Drawings
Figure 8 Outline drawing: 100 – 250amp Liebert STS2 with a key lockout switch option
Notes:
1. All dimensions are in inches and (millimeters).
2. 18" (457mm) min. clearance above unit required for air exhaust.
3. Clearance of 36" (914mm) minimum is required in the front for
installation and service access.
4. Heat output: 2710 btu/hr (0.80 kW/hr) max. for 100A switch.
4680 btu/hr (1.37 kW/hr) max. for 250A switch.
5. Weight: 780 lb. (354 kg)
6. Unit bottom is structurally adequate for forklift handling.
7. Keep cabinet within 15 degrees of vertical while handling.
8. Color - IBM off-white.
9. Open door to replace air filter, disposable type, size 1x25x25.
10.Threaded mounting holes (see detail a) are provided for seismic
PS211101
Rev. 02
anchoring or floor stand. Mounting bolts must be threaded into
the unit mounting holes from underneath the unit base. If floor
stand is used, the casters must rest on the floor stand to support
the weight of the unit.
21
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Installation Drawings
Figure 20 Liebert STS2 non-automatic circuit breaker schedule
Liebert STS2
Ampere
Rating, A
Withstand
Current
Vendor
Type
Ampacity, A
Voltage
200-240V
380-480V
600V
125K
100K
50K
100
ABB
T4L
250
200-240V
380-480V
600V
125K
100K
50K
250
400
600
800
1000
ABB
ABB
T4L
T5L
T5L
T6H
PJ
250
400
600
800
1200
200-240V
380-480V
600V
150K
100K
25K
200-240V
380-480V
600V
150K
100K
25K
ABB
200-240V
380-480V
600V
125K
65K
25K
ABB
200-240V
380-480V
600V
100K
65K
25K
Square D
1. The Liebert STS2 non-automatic breakers are 3-pole, 600VAC rated with magnetic trip only.
2. Upstream devices (by others) must be used to provide overcurrent protection. Upstream overcurrent protection should
have ampacity equal to or less than the ampere rating of the static switch.
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Installation Drawings
Figure 23 Control wiring for remote source selection option
See Note 1
Source 1
Preferred
Source 2
Preferred
S1 GND S2 GND
1
2
3
4
5
6
TB50
Remote Source Selection
NOTES
1. Customer-provided normally open dry contacts. Rating 10mA at 30VDC.
2. Maximum cable length 500 ft. (152m) with #16 AWG, 300V minimum
flexible stranded cable.
3. All control wiring (by others) must be run separate from power wiring .
Control wiring runs should not be combined in the same conduit.
4. Refer to Static Transfer Switch control diagram for location of remote source
selection opt.
5. All wiring must be in accordance with national and local electrical codes.
PS213007
Rev. 02
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Installation Drawings
Figure 25 Control wiring for the input contact isolator board option
“NO CUSTOMER CONNECTION”
1 2 3 4 5 6 7 8 9 10111213141516
J51
INPUT CONTACT ISOLATOR BOARD
02-810012-XX
PS213002
Rev. 03
NOTES:
Table J51
1. Customer control wiring connection points are Terminals 1 through 16
2. Customer-provided, normally open, dry contacts for user alarm messages.
Input
Contact Pin No.
1
3. Refer to installation, operation and maintenance manual for configuring the
Input Contact Isolator board option.
4. All control wiring (by others) must be run separate from power wiring. Control
wiring runs should not be combined in the same conduit.
location of Input Contact Isolator board option.
6. Signal voltage: 100mA @ 12VDC.
7. Maximum cable length 500 ft. (152 m) with #16 AWG flexible, stranded cable.
8. All wiring must be in accordance with national and local electrical codes.
9. When the Transfer Inhibit option is supplied, connect a N.O. dry contact
(customer-supplied) to Input Contact 8 (Pins 15 and 16). When the customer
contact closes, transfers will be inhibited as long as the contact remains closed.
Input Contact 8 is factory-set so no setup is required. The Transfer Inhibit option
prevents Input Contact 8 from being used for any other input.
1
2
3
2
4
5
3
6
7
4
8
9
5
10
11
6
12
13
7
14
15
8
16
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Installation Drawings
Figure 26 Control wiring for comms board
EXTERNAL MODEM
SEE DETAIL A
J81
J1A
TB51
TB55
TB56
LIEBERT
SITESCAN
SEE DETAIL B
“NO CUSTOMER
CONNECTION”
“NO CUSTOMER
CONNECTION”
COMMS BOARD
02-810015-XX
CUSTOMER-SUPPLIED
INTERCONNECTING CABLE
TO EXTERNAL MODEM
CUSTOMER-SUPPLIED
INTERCONNECTING CABLE
TO LIEBERT SITESCAN
SEE NOTE 2
SEE NOTES 1 & 2
1
2
3
4
5
6
7
8
9
1
2
3
J81
DETAIL A
TB 55
PS213003
Rev. 02
DETAIL B
NOTES
1. Maximum cable length 1000 feet (300 meters) with
twisted pair cable #22 AWG 300V minimum.
2. Signal voltage 5VDC, current 10mA.
3. Refer to installation, operation and maintenance
manual for configuring the COMMS board.
4. All control wiring (by others) must be run separate from
power wiring. Control wiring runs should not be
combined in the same conduit.
5. Refer to control connection location diagram (Figure 21
6. All wiring must be in accordance with national and
local electrical codes.
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Installation Drawings
Figure 28 Control wiring for the RS-232 port
See Detail A
NOTES
1. RS-232 communication through
DB9 connector.
2. Connector accessible with front
door open . Connector must be
removed before closing door .
LCD DISPLAY
6 7 8 9
1 2 3 4 5
TXD RXD GND
DB9 Connector
Detail A
Front View
Upper Half of Unit
With Door Open
PS213006
Rev. 01
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Installation Drawings
Figure 29 Outline drawing for input junction box
Power Terminal Block
Recommended Location for
Customer Connection of Input
Power Raceway(by others)
3-Phase, 3-Wire Plus Ground
Location of
Factory-Supplied
Input Power
A
B
C
G
Cable Assembly
INPUT JUNCTION BOX
G
Diameter hole
B
H
E
A
D
C
PS211005
Rev. 0
NOTES:
1. Two junction boxes are supplied, one for each input.
2. Cable(s) are factory-supplied to connect the junction
box to the input busbars. See electrical field
connections drawing for location.
3. Parallel cables are used on 400A and 600A units.
Input Junction Box
Dimensional Data - Inches (mm)
Rating
A
B
C
D
E
F
G
H
Wire Size Range
100A
16 (406) 14 (356) 6 (152) 17-1/2 (445) 12 (305) 16-3/4 (426) 5/16 (8) 1 (25) #6 AWG to #2/0 AWG
(2) #6 AWG to (2)
250A - 600A 16 (406) 30 (762) 6 (152)
33 (830)
10 (254)
32 (813)
7/16 (11) 3 (76)
500 kcmil
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Installation Drawings
Figure 31 LED display
(E)
1
4
1
(A)
(H)
(C)
3
(J)
(G)
3A
2
2
(B)
(D)
(F)
5
(L)
!
(K)
(M)
(N)
PS211002
Rev. 0
LED DISPLAY LEGEND
Description
Symbol
LED
A
B
C
D
E
F
G
H
I
Green Source 1 Power is Present
Green Source 2 Power is Present
Green Source 1 Within Tolerance
Green Source 2 Within Tolerance
Green Source 1 SCRs is On
Green Source 2 SCRs is On
Yellow Source Transfer Inhibited
Green Push Button to Select Source 1 as the Preferred Source
Green Push Button to Select Source 2 as the Preferred Source
Green Output Power is Present
J
K
Alarm Silence Button
Symbol to Indicate the K and M Must Be pushed at the
Same Time to Reset Alarm
L
M
N
1
Alarm Reset Push Button
Red
Alarm Present
Green CB1 Closed
Green CB2 Closed
Green CB3 Closed
Green CB3A Closed
Yellow CB4 Closed
Yellow CB5 Closed
2
3
3A
4
5
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Introduction to Liebert STS2 Operations
8.0 INTRODUCTION TO LIEBERT STS2 OPERATIONS
8.1 System Description
A Liebert STS2 provides an automatic, seamless transfer between input power sources to an output
load. The Liebert STS2 monitors the input sources, to ensure each source is operating within set
parameters, as well as ensure that each source is within acceptable tolerances for a transfer between
sources to be completed.
The Liebert STS2 contains two static transfer switches in one enclosure to allow the unit to transfer its
load between the two input sources without an interruption of power to the load longer than 1/4 cycle.
If a problem is detected with a primary (Preferred) input source and defined trigger points are
reached, the Liebert STS2 automatically switches the input to the other (Alternate) input source. The
Liebert STS2 continues to monitor both sources and can automatically transfer the load back to the
preferred source, if so configured, when that source returns to acceptable operating parameters.
The system control logic automatically monitors the input sources and power output to ensure that
they are operating within acceptable tolerances. The system logic manages the transfer between
sources.
The Liebert STS2 front panel contains either a Color Graphical Display on an LCD touch screen or an
LED display.
The Color Graphical Display provides a menu-driven operator interface, and a display of system
information, status information, a one-line diagram (Mimic) of the Liebert STS2, active alarms, and
alarm history information.
The menu selections provide control of the preferred source, manual transfer initiation. Buttons
provide for audible alarm silence and reset.
Through the touch screen, specific voltage, current and environmental parameters can be configured
to trigger events that can sound an alarm, write to a history log and either transfer sources or inhibit
a transfer.
In units not equipped with the touch screen, LEDs provide the user with the ability to monitor the
Liebert STS2 and quickly assess problems.
Preferred input source selection, alarm reset and alarm silencing are done through buttons on the
touch screen, or push buttons with the LED display.
Communication options can be installed in the Color Graphical Display (LCD) unit only. These
options provide external communication with the Liebert STS2 through a modem, a network card, a
programmable relay board, a contact isolator, or an RS-422 port to Liebert SiteScan.
8.1.1 Redundancy
Redundancy within the Liebert STS2 prevents one component from being a single point of failure,
should a problem occur. Redundant circuits and components are used to eliminate single points of
failure.
Since the Liebert STS2 has two input sources, no single component failure can cause a loss of power to
the load. Redundant power supplies are provided which feed a DC dual-bus used throughout the unit
to prevent any single-point power supply failure modes.
Three separate redundant control logic modules are built into the system. Each contains the logic
necessary to run the Liebert STS2, and control all transfers.
Redundant fans are provided if a primary fan fails. The redundant fans turn on to prevent
overheating inside of the unit.
Should the front panel interface fail, either touch screen or LEDs, the control logic continues to
operate and the unit would transfer should a problem be detected on the preferred source.
Information on the monitoring parameters would be available through the remote communication
options, if available, or the DB9 (RS-232) connector located next to the LCD display behind the front
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Introduction to Liebert STS2 Operations
8.1.2 Reliability and Agency Requirements
The Liebert STS2 is designed for high reliability and high availability with a critical bus Mean Time
Between Failure (MTBF) exceeding 1,000,000 hours.
The Liebert STS2, Control/Power Module and all its options are designed, tested and certified, where
applicable, to meet agency requirements as follows:
• UL 1008: Transfer Switch Equipment, for UL and ULc listing
• UL1459: Telephone equipment (Modem)
• NEC
• FCC Part 15 EMI emission limits for Class A computing devices.
The Liebert STS2 uses conservatively rated components, minimizing the need to go to maintenance
bypass. All maintenance and repair work can be done through the front panel of the unit. This access
makes repairs and maintenance easier.
Gating and control logic are partitioned so that failure of one source’s gating or sensing logic does not
prevent the switch from transferring to the other source.
All control and logic components are mounted separate from the power components. The Liebert STS2
is designed to minimize the exposure of hazardous voltages to allow safe servicing of the unit while
the load is energized.
All electrical components requiring normal maintenance are replaceable without de-energizing the
load, as long as one source is available. Solid-state switching devices are packaged to allow safe repair
of those devices without having to de-energize the load. All non-automatic switches or circuit breakers
are the plug-in or draw-out type to allow replacement without de-energizing the load. All solid-state
power switching devices are rated to prevent hazardous device failure in power systems with
8.1.3 Factory Backup and Service Assistance
Because improper installation can cause a system to fail, a Liebert Services service technician should
thoroughly inspect the unit to ensure it is properly installed and its operating parameters are
properly configured.
Once the Liebert STS2 is properly installed, you, as the on-site operator, can easily monitor the unit’s
operation utilizing the touch screen or LEDs.
If you need assistance, or have questions, contact Liebert Services for technical support at
1-800-LIEBERT (800-543-2378).
8.2
Modes of Operation
8.2.1 Normal (Preferred Source)
Under normal operating conditions, the Liebert STS2 routes power from the preferred input source to
the output load. The unit monitors the voltage current and phase of each source to ensure that both
are operating within set tolerances, and that the alternate source is available, should a transfer be
required
8.2.2 Transfer
Should the preferred source fail or be outside acceptable voltage limits, the Liebert STS2 transfers
the input to the alternate source until the problem is rectified in the preferred source. The unit can be
set to automatically transfer the input back to the preferred source, or only allow the transfer to be
done manually.
8.2.3 Transfer Inhibit
For a transfer to be completed between input sources, the sources must meet certain parameters, or
the transfer cannot take place. Uninterrupted transfer between sources is inhibited due to input
source failure, sources out of sync, switch failure, or the unit is in bypass mode.
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Introduction to Liebert STS2 Operations
8.2.4 Bypass
The static transfer switch can be manually bypassed to allow the power from a source to directly flow
to the output load. This bypass allows the unit’s electronics to be serviced without dangerous voltages
being present.
The Liebert STS2 includes key-interlocked maintenance bypass breakers that allow either input
source’s electronics to be bypassed for maintenance without interruption of power to the load. The
maintenance bypass allows all electronics to be isolated from the input, output, and bypass
connections. Bypass instructions are available from the touch screen and are discussed later in this
manual.
8.3
Operator Controls
The Liebert STS2 is equipped with an interface to configure and monitor the unit either locally or
remotely. The Color Graphical Display is a touch screen LCD that provides a color diagram (Mimic)
that displays the current status of the unit. System parameters are displayed and help is available to
initiate source transfers, view event and history logs, and view bypass and other operational
instructions.
Figure 44 Liebert STS2 touch screen display
Mimic
Event controls
Event Display
Display Panel
and
Help Screen
Menu Options
Touch screen control buttons allow you to reset alarms, silence the audible alarm, review
configurations, event and history logs, preferred source, startup and bypass procedures, and the help
menu. Qualified personnel, with a password, can use these menus to configure parameters, select a
preferred source and do manual source transfers.
LED display units do not have the color LCD touch screen. Instead of the touch screen, these units are
monitored by a series of LEDs and controlled by a series of push buttons.
Both units can be accessed from a terminal, or a PC running terminal emulation software, that is
attached to the unit. Through the RS-232 access, you can monitor and configure the unit, plus
using the RS-232 interface.
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Theory of Operation
9.0 THEORY OF OPERATION
9.1 General Description
The Liebert STS2 contains all the equipment necessary to prevent an interruption in power flow to
the AC load, should your primary source fail.
9.1.1 Liebert STS2 Static Transfer Switch
The Liebert STS2 is a 3-pole, double-throw, solid state automatic transfer switch that is fed from two
sources. The Preferred source is the input source that normally carries the load when both sources are
available. The preferred source is selectable by the user from the LCD panel or an optional Remote
Source Selection. The unselected source is referred to as the Alternate source and carries the load if
the preferred source should fail or if a manual transfer is initiated.
The unit uses Silicon Controlled Rectifiers (SCRs) connected in parallel, opposing pairs to function as
an AC switch configuration. Three pairs of SCRs connect the AC load to the selected preferred input
source as long as the preferred source is available. A second set of SCRs stands ready to transfer the
AC load to the alternate input source should the preferred source fail. The switching action is a very
fast, break-before-make without an interruption of power to the load longer than 1/4 cycle.
During static switch transfers and retransfers, the conduction state of the SCRs is carefully
monitored and controlled to prevent a current path from one source to the other. This technique
prevents a faulted source from feeding into the other good source.
9.1.2 Source Transfer
The Liebert STS2 allows manually initiated transfers between the two sources. On units without the
Optimized Transfer option the alternate source must be within acceptable voltage limits and phase
tolerances with the preferred source. You begin a manual transfer by selecting the inactive source as
the preferred source. On a manual transfer, the Liebert STS2 transfers between the two sources with
less than one (1) millisecond interruption of power to the load. The transfer can only be completed
when both sources are available and synchronized within the user-adjustable phase synchronization
window. For sources where the two frequencies are not exactly in phase, manually initiated transfers
are delayed by the Liebert STS2 until the two sources are within the defined phase synchronization
window.
The Liebert STS2 with Optimized Transfer option allows manually initiated transfer at any phase
difference, does not require synchronization, as long as the alternate source is within acceptable
voltage limits with the preferred source. Transfer is not delayed if the two frequencies are not in
phase.
Source selection can also be done remotely using the Remote Source Selection option, if installed.
9.1.3 Automatic Transfer/Retransfer
If the preferred source is out of voltage and/or frequency limits, the load is automatically transferred
to the alternate source. The default transfer voltage limits comply with the limits of the IEEE Std.
446-1995 computer voltage tolerance envelope.
If the unit is so configured, the load is retransferred automatically to the preferred source after the
preferred source returns to within the acceptable voltage and frequency limits for at least the defined
retransfer time delay, and is in phase with the alternate source. You can enable and disable
automatic retransfer to the preferred source through a user configuration setting.
Automatic Retransfer Inhibited
If the system makes five transfers from the preferred source to the alternate source in a five minute
period, automatic retransfers back to the preferred source is disabled.
To clear this alarm condition, you must assign the alternate source as the preferred source.
instructions on setting the UV detection.
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Theory of Operation
This alarm also is cleared if the unit transfers to the preferred source due to an alternate source AC
volt failure (i.e., an emergency transfer.)
9.1.4 Emergency Transfer
To ensure that power remains connected to the load, the Liebert STS2 automatically performs an
emergency transfer from one input source to the other when an outage occurs on the existing source.
The automatic transfer takes place if the other source’s voltage is within acceptable limits, and
regardless of the phase difference between the two sources.
Emergency transfers occur without an interruption of power to the load longer than 4 ms.
Emergency transfers from the alternate source to the preferred source are not affected by the Auto
Retransfer Enabled/Disabled or Retransfer Delay user settings.
9.1.5 Load Current Transfer Inhibit
The Liebert STS2 senses the load current. If the load current exceeds the preset level deemed to
represent a load inrush or fault condition, the unit’s logic disables manual and automatic transfers,
even if the selected source’s input voltage is outside the acceptable limits. This event triggers an I-
Peak alarm. If so configured, the Load Current Transfer Inhibit is automatically reset 100
milliseconds after the current and voltage return to within normal parameters. This reset provides
continued protection against a source failure. The Load Current Transfer Inhibit also can be
heading for details.
9.1.6 SCR Failure
The Liebert STS2 continuously monitors the status of the SCR switching devices for proper operation.
In the event of a shorted SCR on the input source powering the load, the Liebert STS2 automatically
triggers an alarm and trips open the other source isolation breaker. In the event of a shorted SCR on
the other input source, the Liebert STS2 automatically triggers an alarm and trips open the other
source isolation breaker.
In the event of an open SCR, the switch automatically triggers an alarm and transfers the load to the
other source. All open and shorted SCR alarm conditions are latched and require the system to be
repaired and reset to restore normal operation.
9.1.7 On/Off Sequence
The Liebert STS2 contains no master On/Off push button control. When connected to the input
sources, the unit’s logic power comes on automatically. The touch screen display (if so equipped) is
active as long as at least one input source is energized and the Control Power Disconnect (located
inside the static switch) is on.
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Theory of Operation
9.2
Detailed Component Description
9.2.1 Controls
Operator Interface
The Liebert STS2 Color Graphical Display unit contains a touch screen color LCD to provide the
operator interface to control and configure the operation of the unit and quickly diagnose problems. A
password and an optional keylock, if installed, are provided for security.
The LED Display unit includes push buttons for source transfer, alarm reset and audible alarm
silence.
Hardware
• The Liebert STS2 operator interface in the Color Graphical Display unit is designed to provide all
of the information required to configure and monitor the unit’s operation.
• The control logic performs automatic operations with minimal operator interface.
• Each Liebert STS2 unit is equipped with either a color LCD touch screen or a panel of LEDs and
push buttons.
• On LED Display units, the RS-232 interface is used for configuration and status and event log
monitoring. The RS-232 interface can also be used with the Color Graphical Display units, if
necessary.
Firmware
The operator interface enables you to monitor the Liebert STS2, to configure set points for transfers,
monitor system parameters and access event and history logs. The firmware is accessible through the
LCD touch screen (if installed) or the RS-232 interface. The firmware includes:
• View and set the preferred source.
• View and configure setpoints.
• View alarms, faults and status.
Additionally, the Color Graphical Display unit provides:
• The mimic graphical representation of the systems operation.
• Menu driven monitoring and configuration.
• Step-by-step instructions to assist you in the startup, shutdown and bypass operations.
• Help on event messages.
• Touch screen alarm reset and silence buttons.
Events in the system, both faults and alarms, are detected and displayed on the LCD. See 11.0 -
• A set of event masks can be configured through the LCD to trigger a system response to an event.
• Report event conditions from other components of the system.
• Monitor and report changes in event condition states. If the event condition’s state changes from
inactive to active, a new event is detected. If the transition is from active to inactive, the event
condition has cleared.
• Process new faults and alarms, and clear inactive alarms.
• Provide the alarm reset and silence options.
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Theory of Operation
9.2.2 Circuit Breakers
Three circuit breakers provide total isolation of the solid-state switching devices with an input
breaker for each source and a load isolation breaker. Two breakers provide for maintenance
bypassing of the solid-state switching devices to either input source.
All switches in the Liebert STS2 are plug-in types, which allows any switch to be replaced without de-
energizing the output bus. The breakers have an interlock in the plug-in base, which prevents the
switch from being withdrawn in the CLOSED position. The switch trips OPEN before it disconnects
from the plug-in base.
9.2.3 SCRs
Brick-type SCRs are used rated to carry the full 100% rated load. Because the unit is a fuseless design
with non-automatic circuit breakers, overcurrent protection is provided by upstream circuit breakers.
9.2.4 Logic Modules
The logic contains three separate redundant logic modules. The modules contain the logic necessary
to run the Liebert STS2 and control transfers and shunt trips under all circumstances, without any
outside assistance once set-up and started properly.
9.2.5 Audible Alarm
An audible alarm is installed on the control board. This alarm is triggered by an alarm condition
detected on the unit. The alarm can be turned off from the touch screen (Color Graphical Display
units) or by a push button (LED Display units). Turning off the audible alarm does not clear or reset
the condition that triggered the alarm.
9.2.6 RS-232 Port
An RS-232 serial port is provided to allow an external terminal to be connected as another user
port.
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Operating Instructions for the Touch Screen Interface
10.0 OPERATING INSTRUCTIONS FOR THE TOUCH SCREEN INTERFACE
CAUTION
!
Before the unit is placed into service for the first time, after equipment relocation, or after the
equipment has been de-energized for an extended period of time, a thorough equipment
inspection and supervised startup by qualified personnel are strongly recommended. Contact
your local Emerson Network Power representative or Liebert Services at 1-800-543-2378 to
arrange for equipment inspection and startup.
After the initial equipment startup, the following operating guidelines can be used for standard
equipment operation. These guidelines should be reviewed for any special equipment modifications,
special site conditions, or company policies that may require changes to the standard equipment
operation.
All programmable functions are preset at the factory to enable the unit to be brought up without the
need to enter all selectable parameters.
This section refers to the LCD touch screen display. This display is discussed in more detail later in
NOTE
If the front panel of your Liebert STS2 has LEDs and push buttons instead of the touch screen
instructions.
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Operating Instructions for the Touch Screen Interface
10.1 Normal System Startup
NOTE
If your Liebert STS2 is connected to a PDU with a Wye configuration, enable the Wye Output
Transformer before starting the system. This setting can be made from the touch screen. Refer
1. Ensure that all Liebert STS2 breakers—CB1, CB2, CB3, CB3A (if supplied), CB4, and CB5—are
in the OFF position.
a. Ensure that the key interlocks for CB1 and CB2 have their bolts retracted.
b. Ensure that the key interlocks for CB4 and CB5 have their bolts extended, thus preventing
CB4 or CB5 from being turned ON.
2. Source/input power should be applied to both Liebert STS2 inputs.
The touch screen control panel should become active and operate properly when at least one of the
inputs is energized is closed.
3. Verify that nominal input voltages are applied to both inputs (Source 1 and Source 2).
The input voltages, selected preferred source, breaker and switch status, and alarms are
indicated on the Mimic screen.
Figure 45 Liebert STS2 touch screen display
Mimic
Sources
Static
Transfer
Switch
Event controls
Event display
4. Close CB1.
5. Verify that Source 1 voltages are nominal and CB1 breaker status is correctly indicated on the
Monitor/Mimic screen.
6. Close CB2.
7. Verify that Source 2 voltages are nominal and CB2 breaker status is correctly indicated on the
Mimic screen.
8. Verify that boxes for the preferred source and corresponding static transfer switch are
highlighted on the Mimic screen, indicating which side of the Liebert STS2 is on.
9. Close Output Breaker CB3 (and CB3A in redundant output configurations).
10. Verify CB3, the Output box, and the Load box are highlighted, indicating that CB3 is closed and
the Output and Load are energized.
NOTE
For redundant output switch units, CB3 descriptions apply to CB3 and CB3A.
11. Press the RESET button on the touch screen to reset any previous alarms.
12. Verify in the Event Display and the Mimic that there are no active alarms.
alarms and possible causes. All active alarm conditions should be corrected before proceeding.
13. Turn on the load equipment following the load equipment manufacturer’s recommendations.
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Operating Instructions for the Touch Screen Interface
10.2 Manual Transfer / Preferred Source Selection
The Source Transfer option (Source Xfers) in the touch screen menu allows you to select a preferred
source. Transfers are only permitted when the voltage and current are within their proper operating
range and the sources are synchronized on units without Optimized Transfer. Units with the
Optimized Transfer option do not require the sources to be synchronized to make a manual transfer.
The Source Transfer screen indicates the synchronization between the two sources, while the voltage
exceeds the parameter set in the Source Set Points. See User Settings on page 89
NOTE
If one source will be de-energized for an extended period (hours or days), set the unit to bypass
mode for the remaining source. Without using bypass, if a failure occurs in the switch
components for remaining source, the Liebert STS2 does not have a second source to switch to
instructions.
If your system contains the LED front panel instead of the LCD touch screen, refer to 14.2.2 -
Manual Transfer / Preferred Source Selection for instructions on this procedure.
Figure 46 Source transfer screen
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Operating Instructions for the Touch Screen Interface
To manually select the preferred source:
1. Verify that the input breakers CB1 and CB2 are closed.
2. Select SOURCE XFERS from the menu bar.
The Select Preferred Source screen is displayed in the Event Display.
3. Check the Mimic to verify that Source 1 and Source 2 input voltages are correct.
4. Select SOURCE 1 or SOURCE 2 as your preferred source.
When conditions are correct, the switch transfers the load to the alternate source by selecting the
alternate source as the preferred source.
This source is now monitored as the preferred source throughout the various configurations set up
through the touch screen.
5. Verify that the correct source is designated as the preferred source and that the input source
changes to the desired source.
The Mimic is updated to indicate the new preferred source. The source is now highlighted with blue
and that source is labeled as the preferred source.
If the Transfer Inhibit message is displayed, check for alarm messages on the Active Status window.
Correct alarm conditions before attempting a source transfer.
NOTE
The preferred source may also be changed via the optional Remote Source Selection option,
thereby initiating a transfer remotely.
10.3 Enabling Remote Source Selection
If your system is equipped with the optional Remote Source Selection option, it must be enabled.
If you your system includes the Color Graphical Display:
1. Select CONFIG from the menu bar.
2. Select SYSTEM SETTINGS from the Configuration menu.
3. Select SYSTEM OPTIONS from the System Settings menu.
4. Select YES for the REMOTE SOURCE SELECT choice.
If your system contains the LED display or you are configuring the system from the RS-232 port, see
10.4 Maintenance Bypass
The Liebert STS2 is equipped with two key-interlocked, bypass breakers, CB4 and CB5, to allow
manual bypass of the switch electronics for either input source in the event of switch failure or for
operating on maintenance bypass, all voltages are removed from the Liebert STS2 electronics to
facilitate safe repair, without de-energizing the load using a make-before-break switching sequence.
However, the unit can be bypassed using a make-before-break switching sequence only to the same
source to which that the switch is connected, as indicated by the highlighted static transfer switch box
on the Mimic screen.
In the event of source or switch failure, the unit should be bypassed only to the current input source.
For convenience, instructions for the bypass procedure can be displayed on the touch screen by
selecting the BYP. PROC option from the menu bar.
The Mimic is used to verify the status of the unit during the bypass procedures. In the unlikely event
that the Color Graphical Display is not available, open the front door and look through the slots in the
control door. If you can see green LEDs on the gate driver board through that slot, then the unit is
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Operating Instructions for the Touch Screen Interface
Figure 47 Gate board viewing slot locations
Touch Screen
Viewing Slot for
the Source 1
Gate Drive Board
Viewing Slot for
the Source 2
Gate Drive
Board
GREEN LEDS ON THE
GATE DRIVER BOARD
ARE VIEWABLE
THROUGH THIS SLOT
INDICATE THAT THE
STS IS ON SOURCE 1
GREEN LEDS ON THE
GREEN LEDS ON THE
GATE DRIVER BOARD
GATE DRIVER BOARD ARE
VIEWABLE THROUGH THIS
SLOT INDICATE THAT THE
STS IS ON SOURCE 2
ARE VIEWABLE THROUGH
THIS SLOT INDICATE THAT
THE STS IS ON SOURCE 1
If the Color Graphical Display is not available, you can still use the following bypass procedures,
ignore the steps to check the display and check the LEDs.
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Operating Instructions for the Touch Screen Interface
10.4.1 Bypass Procedures for Source 1
To bypass the switch for Source 1:
NOTE
To bypass the Source 1 static transfer switch when Source 2 is presently active, you must first
1. Verify that Source 1 is supplying power via the Mimic.
• If the Color Graphical Display is not available, check the gate driver board LEDs through the
2. Remove the interlock key from CB5 and place it in the CB4 interlock.
3. Open the alternate source input breaker CB2.
4. Rotate and remove the CB2 interlock key.
5. Insert the key in the CB4 bypass breaker interlock.
6. Rotate the interlock keys in the CB4 bypass breaker interlock to retract the interlock.
7. Close bypass breaker CB4.
8. Verify the breaker status on the Mimic screen.
9. Open source input breaker CB1.
10. Rotate the CB1 interlock key and remove it to lock out the breaker.
11. Secure the key according to your site’s lockout/tagout procedure.
12. Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch
from the load.
To return to normal mode:
1. Insert the key in the CB1 breaker interlock.
2. Rotate the key to retract the interlock.
3. Close source input breaker CB1.
4. Verify Source 1 and CB1 breaker status on the Mimic screen.
5. Select the SOURCE 1 button in the SOURCE XFERS menu.
6. Close output breakers CB3 and CB3A (if supplied).
7. Verify CB3 and CB3A breaker status.
8. Verify that STS SOURCE 1 and OUTPUT boxes are highlighted on the Mimic screen.
9. Open bypass breaker CB4.
10. Rotate the keys in the CB4 interlock to extend the interlock.
11. Remove the proper key from the CB4 interlock and insert it in the CB2 breaker interlock.
12. Rotate the key to retract the CB2 breaker interlock.
13. Close source input breaker CB2.
14. Verify the STS SOURCE 2 box and CB2 breaker status on the Mimic screen.
• If the Color Graphical Display is not available, check the gate driver board LEDs through the
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Operating Instructions for the Touch Screen Interface
10.4.2 Bypass Procedures for Source 2
To bypass the switch for Source 2:
NOTE
To bypass the Source 2 static transfer switch when Source 1 is presently active, you must first
1. Verify that Source 2 is supplying power via the Mimic.
• If the Color Graphical Display is not available, check the gate driver board LEDs through the
2. Remove the interlock key from CB4 and place it in the CB5 interlock.
3. Open the alternate source input breaker CB1.
4. Rotate and remove the CB1 interlock key.
5. Insert the key in the CB5 bypass breaker interlock.
6. Rotate the interlock keys in the CB5 bypass breaker interlock to retract the interlock.
7. Close bypass breaker CB5.
8. Verify the breaker status on the Mimic screen.
9. Open source input breaker CB2.
10. Rotate the CB2 interlock key and remove it to lock out the breaker.
11. Secure the key according to your site’s lockout/tagout procedure.
12. Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch
from the load.
To return to normal mode:
1. Insert the key in the CB2 breaker interlock.
2. Rotate the key to retract the interlock.
3. Close source input breaker CB2.
4. Verify Source 2 and CB2 breaker status on the Mimic screen.
5. Select the SOURCE 2 button in the SOURCE XFERS menu.
6. Close output breakers CB3 and CB3A (if supplied).
7. Verify CB3 and CB3A breaker status.
8. Verify that STS SOURCE 2 and OUTPUT boxes are highlighted on the Mimic screen.
9. Open bypass breaker CB5.
10. Rotate the keys in the CB5 interlock to extend the interlock.
11. Remove the proper key from the CB5 interlock and insert it in the CB1 breaker interlock.
12. Rotate the key to retract the CB1 breaker interlock.
13. Close source input breaker CB1.
14. Verify the STS SOURCE 1 box and CB1 breaker status on the Mimic screen.
• If the Color Graphical Display is not available, check the gate driver board LEDs through the
10.5 Normal System Shutdown
The Liebert STS2 can be shut down from either the static switch mode or the bypass mode.
10.5.1 Shutdown in Static Transfer Switch Mode
When the Liebert STS2 is operating on static transfer switch mode (not maintenance bypass mode):
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open CB3 to turn off the static switch output.
• Open CB3A if the static transfer switch has a redundant output configuration.
3. Open the input switches CB1 and CB2.
4. To completely de-energize the unit, turn OFF power to both inputs to the Liebert STS2.
10.5.2 Shutdown in Maintenance Bypass Mode
When the Liebert STS2 is operating on bypass:
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open the bypass switch (CB4 or CB5) to turn off the static transfer switch output.
3. To completely de-energize the unit, turn OFF the power to both inputs to the Liebert STS2.
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Alarm and Faults
11.0 ALARM AND FAULTS
Alarms and faults are events that are triggered when the operation of the Liebert STS2 falls outside
the defined parameters. These events can also be triggered by: user actions, such as changing
configurations, clearing logs, etc.; failed components such as a fan failure, an SCR that is open or
closed, etc.; and system status, such as open circuit breakers, load on alternate source, etc. These
events can provide a warning or trigger the system to make a change, such as switch sources or the
recording of a history log.
The Liebert STS2 monitoring system detects and annunciates a comprehensive set of fault and alarm
conditions. Faults and alarm messages are can be viewed on the LCD touch screen or via the RS-232
port.
On the LCD touch screen, the events are shown in the Status Display panel in the lower left corner of
the touch screen and written to the Event log. You can touch a message to view a definition of an
information on the touch screen.
page 77 for the commands to view event logs, and alarm and fault lists.
Event actions can be triggered by the settings configured from the Event Masks. See 11.1 - Event
Mask for more information.
Faults — A fault indicates that a component of the Liebert STS2 has failed or has been damaged. In
the Event Display, faults are indicated in red.
Alarms — An alarm is an event caused by a significant abnormal system condition. In the Event
Display, alarms are indicated in yellow. The setpoints for many of the alarms are configurable
through the User Settings. Many alarms clear themselves when the condition is resolved. If an alarm
event mask is set to latch, the alarm messages remain active until the alarm condition has been
When the system is furnished with an external modem and a telephone line is connected to the
modem, the system can be programmed to automatically dial out upon occurrence of any of certain
designated alarms. The auto-dial feature can be configured for alarms using the Event Mask option in
modem.
11.1 Event Mask
The Liebert STS2 gathers, processes and reports faults and alarms, collectively referred to below as
events. The Event Mask dialog box allows you to set the system’s response for specific alarms and
faults that are generated.
The following mask types are available for each event:
• Latch — If a latch is enabled for the selected event, that event remains active even if the
originating event condition clears. A latched event may only be cleared by pushing the RESET
button (ALRMRST on the LED units).
• Dial Out — If the selected event is triggered, the system automatically calls the specified
telephone numbers through a modem. For example, a page could be sent or an event could be sent
information on configuring communications options.
• Event Log — The selected event is date/time stamped and recorded to the Event Log when the
event is triggered.
• Audible — If the selected event is triggered, an audible beeper or horn is sounded by the Liebert
STS2. The beeper continues while this event is active or latched, or until the SILENCE button
(NOAUD on the LED units) is pushed. This button must be pushed with the ALRMRST button on
the LED units.
configuration using the RS-232 port.
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Alarm and Faults
11.2 Event and History Logs
The system tracks events through the Events Log and tracks significant events through the History
Logs. These logs allow you to quickly spot trends or diagnose problems that the unit may have had.
Both logs are written in nonvolatile memory.
page 77 for the RS-232 interface commands used to access the logs.
11.2.1 Event Log
The events are tracked in sequence of occurrence. The sequence of occurrence is identified by date,
time, and frame number. The last 512 events are stored in a nonvolatile memory and can be viewed
from the Event Log.
Event logs wrap, meaning when the log is full, the oldest event is deleted when a new event is written
to the log.
The Event Log tracks:
• # — the sequence number in which the event occurred since the log was last cleared.
• Message — the event that occurred, such as Ambient Overtemp., Source 1 Fail, etc.
these events.
• ID — the event identifier.
• Date and Time — when the event occurred.
• Faults — the number of fault events logged.
• Alarms — the number of alarm events logged.
• User Alarms — the number of alarm events logged that were triggered by user-created alarms,
such as those alarms created with the Input Contact Isolator settings.
• Total — the sum of all the events currently logged.
11.2.2 History Log
When a designated major alarm occurs, the History Status buffer is frozen, capturing 64 sequential
frames before and after the alarm condition. When the History Status buffer is frozen, a History Log
is created.
Two History Logs are available to track major alarms. This log includes the triggering event plus the
surrounding events, and the system voltages, currents, frequency, power, source selection and
breaker positions at the time of the event. The History Log displays the 64 sequential frames, in
4-millisecond intervals, of the Present Status screens surrounding the event.
If you are viewing the log from the touch screen, the Mimic and the Event Display show the data that
was present as the alarm was triggered. The data is displayed as frames are played.
The History Log allows you to replay the events leading up to the alarm and the events right after the
alarm to see the status of the switch at that time and diagnose the cause of the alarm. The History
Log is triggered when certain events are tripped that have the Freeze option enabled.
You can run through the frames sequentially. The sequence of the events is identified by date, time,
and frame number. The History Log frames are stored in a nonvolatile memory buffer that is
continuously overwritten until a designated fault condition occurs. When the fault occurs to trigger a
freeze, the History Log stores the next 23 frames, then freezes until it is reset. The History Log then
keeps 40 frames before the fault, the frame where the fault occurred, plus the next 23 frames.
The History Log should not be reset until the fault condition that caused the buffer to freeze is
reviewed and investigated by a qualified service technician. After the alarm condition has been
corrected, the History Log can be cleared.
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Alarm and Faults
The History Log has the following fields:
• Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN buttons
to set the time.
• Status — the status of the Liebert STS2 at the point of the current frame in the replay. The
History log has three statuses: Frozen, Not Frozen and Retrieving Data, please stand by.
• Critical Event — The event which triggered this log to be written. The event is indicated in red on
the bar graph.
• Frame Number — the current frame in the replay. A negative number indicates the replay is at a
point before the triggering event occurred.
11.3 Alarm Notes
The I-PK on Source 1 and I-PK on Source 2 alarms inhibit automatic transfer due to an overload or
load fault. These alarms can be set for either auto or manual alarm reset.
In the auto reset mode, the alarm is reset 100 milliseconds after the load current and source voltage
return to normal, and transfers are no longer inhibited. In manual mode, the alarm remains active
and transfers are inhibited until the conditions return to normal and the user manually presses the
RESET button (ALRMRST button on LED units). In either case, the cause of the Source 1 or Source 2
I-Peak overload should be investigated and resolved (such as by reducing the overload condition or
clearing the output fault) before returning the switch to normal operation.
SCR fault events indicate a device failure. The device must be replaced and the system must be
restarted for the fault to clear. A shorted SCR automatically trips open a source input switch (CB1 or
CB2) to prevent transfers in the event of an SCR failure. The SCR failure must be investigated and
repaired before returning the switch to normal operation. Both source input switches must be opened
(such as when the unit is placed in maintenance bypass for servicing) before a shorted or open SCR
alarm can be reset.
11.4 List of Messages
Table 8 lists available event messages, a definition of the event, and the functions that are activated
with the event by default. The functions are indicated as follows:
D — The indicated event initiates the Auto-Dial sequence through a modem.
A — The indicated event activates the Audible alarm.
F — The indicated event triggers a Freeze of the History Log.
L — The indicated event Latches. A latched alarm remains displayed until the alarm condition
has cleared and the RESET (ALRMRST) button has been pressed.
E — By default, all faults and alarms are written to the Event Log. Changing this setting is only
available for the LED units and is set through the RS-232 port. See Setting Event Masks with
All of these functions, except Freeze, can be reconfigured to trigger for each event, using the Event
changed for an event.
If the front panel of your Liebert STS2 has LEDs and push buttons instead of the touch screen
interface, you can view these messages via the RS-232 port. See 12.1.1 - Connecting and Using a
An LED is used to indicate the presence of any active fault or alarm. Refer to 14.0 - Operating the
Liebert STS2 LED Display for more information about the LEDs.
.
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Alarm and Faults
Table 8
ID
Event messages
Alarm Message
Description/Cause
Action
001 S1 SCR SHORT
002 S2 SCR SHORT
003 S1 SCR OPEN
004 S2 SCR OPEN
One or more of the SCRs for Source 1 have shorted and failed. D, F, A, E
One or more of the SCRs for Source 2 have shorted and failed. D, F, A, E
One or more of the SCRs for Source 1 is open.
One or more of the SCRs for Source 2 is open.
D, F, A, E
D, F, A, E
A primary cooling fan has failed and the unit is now being
cooled by a secondary fan, which is not monitored.
005 PRIMARY FAN FAIL
D, A, E
006 CONTROL MODULE FAIL
007 PWR SPLY DC A FAIL
008 PWR SPLY DC B FAIL
009 PWR SPLY S1 AC FAIL
010 PWR SPLY S2 AC FAIL
011 PWR SPLY LOGIC FAIL
012 OUT VOLT SENSE FAIL
013 S1 VOLT SENSE FAIL
014 S2 VOLT SENSE FAIL
015 S1 SCR SENSE FAIL
016 S2 SCR SENSE FAIL
017 S1 CURR SENSE FAIL
018 S2 CURR SENSE FAIL
019 S1 GATE DRIVE FAIL
020 S2 GATE DRIVE FAIL
021 INTERNAL COMM FAIL
022 EXTERNAL COMM FAIL
023 CB1 SHUNT TRIP FAIL
024 CB2 SHUNT TRIP FAIL
064 HEATSINK OVERTEMP
067 S1 UV
Control logic module has failed.
Power supply DC bus A has failed.
Power supply DC bus B has failed.
Power supply Source 1 AC has failed.
Power supply Source 2 AC has failed.
A power supply module has failed.
The output volt sense module failed
The Source 1 volt sense module failed.
The Source 2 volt sense module failed.
The Source 1 SCR sense module failed.
The Source 2 SCR sense module failed.
The Source 1 SCR current module failed.
The Source 2 SCR current module failed.
The Source 1 gate drive module failed.
The Source 2 gate drive module failed.
Internal CAN communications failed.
Options CAN communications failed.
CB1 shunt trip failed.
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
D, A, E
A, E
A, E
CB2 shunt trip failed.
D, A, E
A, E
Heatsink has exceeded the recommended temperature.
Source 1 under voltage, fast detection.
Source 1 under voltage, slow detection.
Source 1 over voltage
A, E
068 S1 UV (RMS)
L, A, E
A, E
069 S1 OV
070 S1 OF/UF
Source 1 over frequency/under frequency
Source 1 failure.
A, E
071 S1 FAIL
A, E
072 S2 UV
Source 2 under voltage, fast detection.
Source 2 under voltage, slow detection.
Source 2 over voltage.
A, E
073 S2 UV (RMS)
A, E
074 S2 OV
A, E
075 S2 OF/UF
Source 2 over frequency/under frequency.
Source 2 failure.
A, E
076 S2 FAIL
A, E
077 S1 OVERCURRENT
078 S2 OVERCURRENT
079 S1 I-PEAK
Source 1 over current.
A, E
Source 2 over current.
A, E
I-PK on Source 1.
A, F, E
A, F, E
A, E
080 S2 I-PEAK
I-PK on Source 2.
081 SOURCES OUT OF SYNC
082 LOAD ON ALT SOURCE
083 AUTO REXFER INHIBIT
084 CB1 (S1) OPEN
Source 1 and Source 2 are out of synchronization.
The output load is running on the alternate source.
Automatic retransfer is inhibited.
Source 1, Circuit Breaker 1 is open.
A, E
A, E
A, E
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Alarm and Faults
Table 8
ID
Event messages (continued)
Alarm Message
Description/Cause
Action
A, E
085 CB2 (S2) OPEN
Source 2, Circuit Breaker 2 is open.
086 CB4 (S1 BYP) CLOSED
087 CB5 (S2 BYP) CLOSED
088 CB3 (OUTPUT) OPEN
089 CB3A (OUTPUT) OPEN
090 S1 PHASE ROT ERROR
091 S2 PHASE ROT ERROR
092 TRANSFER INHIBITED
093 OUTPUT UV
Source 1 on bypass, Circuit Breaker 4 is closed.
Source 2 on bypass, Circuit Breaker 5 is closed.
Output circuit breaker (CB3) is open.
Output circuit breaker (CB3A) is open.
Source 1 phase rotation error.
A, E
A, E
A, E
A, E
A, E
Source 2 phase rotation error.
A, E
Transfer inhibited.
A, E
Output is under voltage.
D, F, A, E
120 INPUT CONTACT #1
121 INPUT CONTACT #2
122 INPUT CONTACT #3
123 INPUT CONTACT #4
124 INPUT CONTACT #5
125 INPUT CONTACT #6
126 INPUT CONTACT #7
127 INPUT CONTACT #8
Input Contact # x is an optional alarm input. The alarm name
can be programmed with an alarm name from the Input
Contactor Isolator settings option under the Comm Options.
page 96. The alarm is sent to Monitor DSP. The LCD logs the
alarm with the programmed name. Monitor DSP logs it with the
generic name which is how it is reported to the SVT query.
A, E
128 CONFIG MODIFIED
A set point configuration has changed.
A, E
A, E
The password for touch screen access has been modified and
saved.
129 PASSWORD CHANGED
130 TIME REPROGRAMMED
131 DATE REPROGRAMMED
132 EVENT LOG CLEARED
133 HIST LOGS CLEARED
The system’s time has been reset and saved.
The system’s date has been reset and saved.
The event log has been erased.
A, E
A, E
A, E
A, E
Both History Logs have been erased.
Both History Logs have been written and no more history logs
can be written without clearing one of the logs.
134 HIST LOGS FULL
A, E
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Communication Interfaces
12.0 COMMUNICATION INTERFACES
The Liebert STS2 monitoring system offers several choices for communications.
The RS-232 terminal port is standard on all units. The port is located inside the front door, to the left
an alternate user interface to configure, control, and diagnose the system, especially for systems that
Several other communications options are also available. Those options are located a
Communications compartment to the right of the touch screen/LED front panel and are accessible
options.
Connections to the communication ports are made by wiring to terminal boards located in the
Communications compartment. The communications options listed below reference the control wiring
drawing for each option.
• Liebert IntelliSlot SNMP/Web/Modbus 485 card (optional) — the card provides connectivity to
any TCP/IP-based Ethernet network to allow the device to communicate with network
management systems (NMS) via SNMP/Web(HTTP). Events can be transmitted to the NMS to
provide remote status monitoring, plus fault and alarm detection. The card includes an RJ-45 port
for an Ethernet connection, via Category 5 cable.
The Liebert SNMP/Web/Modbus 485 card can also integrate the system with an existing Building
Management System (BMS) or out-of-band monitoring, using Modbus, a standard multi-drop
protocol. The card has redundant communication paths that make it possible to connect to a BMS
using Modbus while simultaneously communicating to an NMS through SNMP/Web(HTTP).
questions about the card, refer to the user guide, SL-52615, available at the Liebert Web site,
• Input Contact Isolator (ICI) Board (optional) — provides an interface for up to eight user inputs.
External messages and alarms can be routed to the unit, via the ICI.
• Programmable Relay Board (PRB) (optional) — up to two PRBs can be installed in the Liebert
STS2 to route Liebert STS2 events to external devices.
• Comms Board (optional) — includes a terminal block to provide a DTE connection to an external
modem. This board also provides a direct connection to a Liebert SiteScan terminal, via an
RS-422. Liebert SiteLink-12 or Liebert SiteLink-4 is required for Liebert SiteScan to
Data link requirements are Full Duplex Asynchronous RS-232 format.
12.1 Using the RS-232 Port
The RS-232 port is configured with a baud rate of 9600 with 8 data bits, 1 stop bit, no parity, and no
hardware handshaking.
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Communication Interfaces
12.1.1 Connecting and Using a Terminal
An RS-232 connection can be used to connect the Liebert STS2 to either a terminal or a PC running
terminal emulation software. If you are unsure of the cable pin out, see 15.2.10 - Terminal Port
1. Connect the terminal to the Liebert STS2 by plugging the cable from the terminal into the RS-232
port.
This connection can be made at any time.
2. After making the connection, verify the communications link by pressing <ENTER> on the
terminal keyboard.
The interface communications system responds as indicated below:
Repeating command -->
Illegal command!
<?> or <HELP?> displays the RS-232 command set
<?> <command> or <HELP?> <command> displays specific help for the command
SVTP-Control >
The SVTP-Control > prompt indicates that RS-232 communications are established.
• If you receive no response or prompt, verify that the connector is properly plugged into the
port and the PC or terminal serial interface is working properly.
For additional help type <?> <command> or <HELP?> <command>
more details about the commands.
Some terminal commands require a password to function. Use the PWD command and a valid
password to gain access.
Table 9
Terminal commands
Keys
Function
Displays this help menu or specific help with a command
Displays active alarms
?
AA?
AF?
Displays active faults
CEL
Clears the event log
CHL
Clears the history logs
DATE?
DATE
EL?
Displays current system date
Sets system date
Displays the entire event log
HELP?
HLn?
Displays this help menu or specific help with a command
Displays the history log #n, if frozen
Logs user out of unprotected mode
Displays the preferred source
LOGOUT
PS?
PS n
Sets the preferred source to #n
Allows users to access protected commands
Modem only. Ends the session and hangs up the modem.
Silences the horn
PWD
QUIT
SH
SPT?
Displays all current setpoints
the Terminal for a description of groups.
SPTx
SR?
TIME?
TIME
Displays status reports
Displays current system time
Sets system time
UPMDR?
VER?
Displays metering data
Displays firmware versions
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Communication Interfaces
12.1.2 Configuring the Liebert STS2 via the Terminal
The SPT command is used to configure the systems setpoints. The SVT syntax for the setpoints
consists for four parameters:
SPT [group] [item] [value]
where the parameters are:
• SPT — is the terminal command that is used to configure setpoints.
• group — the group under the setpoint command which contains the desired settings.
• item — the item number within the selected group.
• value — the desired value for this item.
Only the specific options words listed in this section use a hexadecimal value. Other settings,
depending on what they are, use other input types. For example, System ID uses a text string,
nominal voltages and currents use standard numeric integers, and modem baud rate uses an
enumeration where 0 = 2400, 1 = 9600, & 2 = 19200 bps.
NOTE
Spaces are placed between each parameter, but not between characters or numbers in a
parameter. Using an underline here to represent a space, an example of a the syntax is:
SPT_2_6_0081. 0081 is the value parameter.
This section provides instructions for setting these parameters, with an example of building an SPT
command for System and User settings.
Groups Parameter
The setpoints are grouped for ease of configuration. For example, Event Masks are Group 4 and
System Settings are Group 2. The numbers shown below are entered for the group parameter. For
example, start of a System Settings command is SPT 2.
The group parameters are:
1 = System Ratings
2 = System Settings
3 = User Settings
4 = Event Mask Settings
For example, the start of a System Settings command is SPT 2, where SPT is the system setpoints
command and 2 is the group parameter for System Settings.
Event Mask parameters.
Item Parameter
numbers are also displayed on the terminal when you list the configuration setting for a particular
group.
Continuing with the example, to configure an Options_1 setting under System Settings, the command
would begin with SPT 2 6
where 6 is the value Options_1. Note the space between each parameter.
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Communication Interfaces
Value Parameter
possible value types and their description.
Table 10 Value types
Type
Definition
Numeric
An integer numeric value in the units indicated by the item name. For example, a System Voltage
Rating of 480 would indicate 480 volts.
Scaled
String
Similar to the Numeric, this value type is an integer that has been scaled, usually to remove
decimal points that would normally appear within the value. In this case, a value of 2.5 may actually
Certain settings are represented by alphanumeric character strings, such as setting the System
Model Number to Liebert STS2.
Enumeration This type uses an indexed list to represent possible choices. One example is the Modem Baud
Rate which uses a value of 0 to select 2400 bps, 1 for 9600 bps, and 2 for 19200 bps.
Bit-packed
This type of value uses a hexadecimal binary word, where each of the sixteen bits in the word has
the value of 1 (True) or 0 (False). Although somewhat difficult to use, it packs a large amount of
data within a single entry. A detailed description of this type appears in section 12.1.3 - Setting
Event Masks This type is a specially formatted and is used to customize the behavior of each fault and alarm in
configuring Event Mask parameters.
Table 11 shows the various groups, the settings contained within, and the type of value it requires.
Table 11
Group
Group settings and values
Item:
1
Description
Input Volts (PDU)
Volts
Value Type
Integer
Value Notes
Set per system spec.
Group 1:
System
Ratings
2
Integer
Set per system spec.
Set per system spec.
Desired freq. x 10 (600 = 60 Hz)
[Not supported at this time]
14 Character max.
3
Current
Integer
4
Frequency
Scaled
1
Language
Enumeration
String
2
System Model Number
System ID Number
System Tag Number
System Order Number
Options_1
3
String
8 Character max.
4
String
8 Character max.
5
String
8 Character max.
6
Bitpacked
String
14 Character max.
7
Autodial Primary Line
Autodial Secondary Line
Autodial Pager Number
Autodial Pager PIN
Modem Init String
Modem Baud Rate
Modem LGS Check - Day
Modem LGS Check - Time
Comms Options 1
Comms Options 2
20 Character max.
Group 2:
System
Settings
8
String
20 Character max.
9
String
20 Character max.
10
11
12
13
14
15
16
String
10 Character max.
String
20 Character max.
Enumeration
Bitpacked
Bitpacked
Bitpacked
Bitpacked
0 = 2400, 1 = 9600, & 2 = 19200 bps
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Communication Interfaces
Table 11
Group
Group settings and values (continued)
Item:
Description
Value Type
Value Notes
SCR1 Fast Undervoltage
Setpoint
1
Integer
In % of nominal below nominal
Group 3:
User
Settings
SCR1 Slow Undervoltage
Setpoint
2
3
Integer
Integer
Integer
Integer
Integer
Integer
Integer
Integer
Integer
Integer
Integer
Integer
Integer
In % of nominal below nominal
In number of lines cycles
In % of nominal above nominal
In 1/4 lines cycles
SCR1 Slow Undervoltage
Detect Delay
SCR1 Overvoltage
Setpoint
4
SCR1 Overvoltage Detect
Delay
5
SCR1 I peak Transfer
Setpoint
6
x 10
SCR2 Fast Undervoltage
Setpoint
7
In % of nominal below nominal
In % of nominal below nominal
In number of lines cycles
In % of nominal above nominal
In 1/4 lines cycles
SCR2 Slow Undervoltage
Setpoint
8
SCR2 Slow Undervoltage
Detect Delay
9
SCR2 Overvoltage
Setpoint
10
11
12
13
14
SCR2 Overvoltage Detect
Delay
SCR2 I peak Transfer
Setpoint
x 10
Max. Transfer Phase
Angle
In degrees
Output Frequency
Deviation
Freq. in Hz x 10
15
16
17
ReTransfer Delay Time
Horn Volume
Integer
In seconds
Integer
Range: 1-10
Critical Option Enabling
Bitpacked
Non-Critical Option
Enabling
18
Bitpacked
1 to
63
Event Mask settings for
faults
Event Mask
Event Mask
Group 4:
Event Mask
Settings
64 to
143
Event Mask settings for
alarms
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Communication Interfaces
12.1.3 Setting Bitpacked Options with the Terminal
Five sets of options and features settings are available through the terminal to control the system
operation.
Under System Settings for the SPT command, these items denote which options are INSTALLED:
• 6 — Options_1
• 14 — Comms Options 1
• 15 — Comms Options 2
Under User Settings, for the SPT command, these items denote which features are ENABLED:
• 17 — Critical Option Enabling
• 18 — Non-Critical Option Enabling
The value parameter settings are in the form of a bit-packed word (in hexadecimal notation). In other
words, each bit indicates a particular setting for the option or feature. The bit assignments for the
options and features are as follows:
Options_1
bit0 — HasDualOutputBreaker
bit1 — HasPDU
bit2 — Has4PoleTransferSwitch
bit3 — HasShuntTrip
bit4 — HasWyeOutputXfmr
bit5 — HasExternalPrecisionTimeSource
bit6 — HasSFA
bit7 — HasRemoteSourceSelect
bit8 through bit15 — not used (set to 0)
Comms Options 1
bit0 — HasIntModem
bit1 — HasExtModem
bit2 — HasNIC
bit3 — not used (set to 0)
bit4 — HasSiteScan
bit5 — not used (set to 0)
bit6 — not used (set to 0)
bit7 — HasOpenCommsDigitalInputBrd
bit8 — HasOpenCommsDigitalOutputBrd_1
bit9 — HasOpenCommsDigitalOutputBrd_2
bit10 — HasRemoteStatusPanelBrd_1
bit11 — not used (set to 0)
bit12 — not used (set to 0)
bit13 — not used (set to 0)
bit14 — EnableDialIn
bit15 — EnableDialOut
Comms Options 2
bit0 — EnablePager
bit1 — EnableOCDINormallyClosed
bit2-3 — OCDO1Assignment (0=User Defined, 1=Standard Set or 2=AS400)
bit4-5 — OCDO2Assignment (0=User Defined, 1=Standard Set or 2=AS400)
bit6 through bit15 — not used (set to 0)
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Communication Interfaces
Critical Option Enabling
bit0—EnableManual_IPeakReset
bit1—EnableAutoRestart
bit2 through bit15 - not used (set to 0)
Non-Critical Option Enabling
bit0 — EnableAutoReXfer
bit1 through bit15 — not used (set to 0)
The bits are set in reverse order, from bit 15 on the left to bit 0 (zero) on the right. The bits are
grouped in four sets of four bits each, as such:
0000 0000 0000 0000
|................................|
bit 15.........................bit 0
Since each bit represents a setting, a bit can be enabled or disabled:
• 1 = installed option or enabled feature
– or –
• 0 = option not installed or feature not enabled
Enabling or disabling the bits in each group creates a binary value for that group. For example, if the
fourth bit in a group is set to 1, the group group’s binary value is 0001.
Each group is translated into a hexadecimal equivalent. The group with the value of 0001 has a hex
equivalent of 1.
You can use this table to help with the conversion:
Table 12 Binary-hexadecimal conversions
Hex
Equivalent
Hex
Equivalent
Binary value
0000
Binary value
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
1010
1011
1100
1101
1110
1111
0001
0010
0011
0100
0101
0110
0111
1000
1001
The hex value for each group is entered in the command as four digits.
To summarize the procedure:
1. Set each bit position.
2. Convert the binary value each group into its hex equivalent.
3. Enter the hex values for each group, in order, into the command for the value parameter.
The following example explains how the conversion is completed.
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Communication Interfaces
Putting the Terminal Command Together
For example, a unit only has the Remote Source Selection and Dual-Output Breaker options installed.
Checking the bits list under Options_1 on page 81, bits 7 and 0 each must be set to 1 to indicate
that these options are installed.
The bit setting is as follows, starting with bit 15 on the left and going down to bit 0:
0000 0000 1000 0001
With the bits combined in groups of four, the binary settings can be translated into hexadecimal
values.
The first two groups in the sample equal zero (0). In the third group, 1000 in binary translates to 8 in
hex. In the fourth group, 0001 in binary translates to 1 in hex.
In hex this equates to (digits in the value parameter cannot have spaces between them):
0081
So your command to indicate that the Remote Source Selection and the Dual-Output Breaker are
installed would be:
SPT 2 6 0081
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Communication Interfaces
12.1.4 Setting Event Masks with the Terminal
The event masks can be customized via a terminal. The command SPT4?<ENTER> displays all faults
and alarms, along with their associated event masks. A plus sign (+) means that particular event
mask is enabled, while a minus sign (-) means that mask is disabled.
flags.
Unlike the System and User Settings, mask values are set by designated letters, not hex values.
However, as with other RS-232 interface settings, four parameters are passed. See 12.1.2 -
parameters.
The syntax for configuring event masks is:
SPT 4 ID ±D±L±S±E±A
• SPT — is the terminal command used to configure setpoints.
• 4 — setting (group parameter) for event masks, under System Settings.
• ID — event ID. The ID is the item parameter for this command. The ID numbers for each event
• D,L,S,E,A — the event masks: Dial, Latch, Summary, Event log, and Audible. The masks are the
value parameter for the command.
Each mask type must be preceded by a plus sign (+) to enable it, or a minus sign (-) to disable it.
NOTE
NO spaces are placed between each mask listed above.
Only the mask that is passed (enabled) is applied when the event occurs.
Note that the Summary and Event Log event masks are only configurable for the LED units.
To set the event masks for a particular event:
1. Enter the command. Examples and descriptions are provided below.
2. Press ENTER.
After the new settings are entered, the new results for that event ID are displayed.
Examples of Event Mask Settings
• To latch event #001, S1 SCR SHORT, use SPT 4 1 +L.
• To disable event #128, CONFIG MODIFIED, from sounding the horn, use SPT 4 100 -A.
• To enable event #012, OUT VOLT SENSE FAIL, to Dial and go into the Event Log, use
SPT 4 12 +D+E.
• To disable all masks for event #120, INPUT CONTACT #1, use SPT 4 120 -D-L-S-E-A.
To breakdown this syntax for the last example:
• SPT — SVT command
• 4 — group parameter, identifying System Setting group under which the Event Mask settings
reside.
• 120 — item parameter. In this command, that is the event ID.
• -D-L-S-E-A — value parameter. In this case, the minus sign (-)disables all masks for the INPUT
CONTACT #1 event.
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Liebert STS2 Touch Screen Display
13.0 LIEBERT STS2 TOUCH SCREEN DISPLAY
The Liebert STS2 can be configured with a Color Graphical LCD touch screen that allows you to
quickly check the status of the unit and identify problems.
A touch screen LCD is available through the front of the Liebert STS2. This screen provides a
graphical (Mimic) display of the switch’s operation, plus system information including system
parameters, alarms and faults.
The LCD provides a color, back-lit touch screen as a user interface. In addition to the Mimic and the
system parameters, the screen provides a series of menus to allow you to configure the Liebert STS2,
including the control of the preferred source, auto/manual retransfer selection, alarm notification,
and other system setpoints. The touch screen also provides buttons to reset alarms and turn off
audible alarms, such as a horn.
13.1 Display Overview
The Liebert STS2 Color Graphical Display provides three areas of information, plus buttons and a
series of menu choices.
The Color Graphical Display contains the following features:
• Mimic — a graphical diagram of the status of the unit.
• Event controls — allow you to reset alarms and turn off audible alarms.
• Event Display — displays any active alarm or fault condition, in real-time.
• Menus — provide choices and configuration settings in dialog boxes or information in the display
panel.
• Display panel — provides additional information, depending on the menu choice that was last
selected. This information includes event help text and startup and bypass procedures.
Figure 48 Liebert STS2 touch screen display
Mimic
Event Controls
Display Panel
Event Display
Menu Options
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Liebert STS2 Touch Screen Display
13.2 Menu Overview
The touch screen menu provides access to configuration settings and more device information.
The CONFIG (Configuration) and LOGS menus provide multiple choices through pop-up menus. The
SOURCE XFER menu selection allows you to select the preferred source. The other menu choices
provide information in the display panel. The menu choices are discussed later in this manual.
All programmable functions are preset at the factory to default settings. These settings enable the
unit to be brought up without the need to enter all selectable parameters. The menus allow the
settings to be customized.
Figure 49 Menus
Logs
Config menu
Event Log
System Rating
History Log 1
History Log 2
Event Masks
User Settings
System Settings
Comm Options
System Options
System ID
NOTE
Some menu choices display a keyboard or keypad on the touch screen. Enter data on the
touch screen.
Click OK to save the data that you have entered.
Use the back arrow button (<-) to delete unwanted characters. This button functions like
a backspace key on a keyboard.
Figure 50 Keyboard and keypad displays
Backspace
Backspace
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Liebert STS2 Touch Screen Display
13.2.1 Security
Because the Liebert STS2 Color Graphical Display provides access to various configuration and
monitoring choices, a password or key lockout switch may be used to protect access to certain
changes, including:
• Change configuration settings.
• Clear logs.
• Make a source transfer.
• Reset an alarm.
Without entering the password or enabling changes with the key lockout switch, you still can:
• View the display, including the mimic, status and event help.
• View logs.
• View the startup and bypass procedures.
• Use the SILENCE button to turn off the audible alarm.
Using the Optional Key Lockout Switch
An optional key lockout switch for the Liebert STS2 enables or disables the ability to make changes
for location of the key lockout switch.
• To disable the changes, turn the key to the top of the switch, toward the closed padlock.
• To enable changes turn the key to the horizontal position, toward the open padlock.
Figure 51 Key lockout switch.
Changes disabled
Changes enabled
Using the Password
If the unit is not equipped with a keylock, a password is required when you attempt to:
• Save changes in the CONFIG menu choices.
• Transfer sources.
• Reset active alarms.
• Clear logs.
When a password is requested, a keyboard is displayed on the touch screen. After you enter the
password, select OK.
The password is case-sensitive. Password access times out after ten (10) minutes, and must be
re-entered to save changes. The time-out period cannot be changed.
To set or reset the password:
1. Select SYSTEM SETTINGS from the CONFIG menu.
2. Select SYSTEM ID form the SYSTEM SETTINGS menu.
3. Click PASSWORD.
A keyboard is displayed.
4. Enter a password.
The password must be four (4) alpha-numeric characters and is case sensitive.
5. Click OK.
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Liebert STS2 Touch Screen Display
13.3 Mimic Display
The Mimic display provides a color diagram of the operation of the Liebert STS2. This display
imitates the power flow through the static transfer switch and indicates source status, breaker status,
switch status, source voltage and current readings, output power measurements, and active alarm
13.4 Event Controls
The Liebert STS2 detects events when certain thresholds are passed or certain problems occur. The
alarm controls allow you to acknowledge the existence of these events.
• RESET — All latched events whose conditions have cleared are removed from the Event Display.
Faults and alarms that remain active, or are not recoverable, are not affected when this button is
selected. This button is also used to perform manual I-Peak resets and manual retransfers.
• SILENCE — turns off the audible alarm (horn or beeper) without resetting the triggering event.
This setting does not permanently turn off the horn. The alarm sounds again when the next event
with an audible alarm setting is triggered.
Active events are shown in the Event Display, whereas cleared events can be reviewed via the Event
Log.
13.5 Event Display
The Event Display lists the condition of the Liebert STS2 in real-time. Both nominal system
parameters and alarm messages are displayed in the Event Display. You can touch any message in
the Event Display to display more information in the Display Panel to the left. The selected status is
displayed in bold type.
13.6 Menu Bar
As previously mentioned, the menu bar provides both configuration choices and information. The
choices under the Config and Log menus access additional dialog boxes, while the other menu choices
only show information in the display panel.
13.7 Configuration Menu
When you select the CONFIG (Configuration) menu choice, a pop-up menu is
displayed with four choices.
• System Ratings — used to configure frequency, voltage and currents settings for
the Liebert STS2.
• Event Mask — allows you to configure system’s response for events.
• User Settings — allows you to configure operations for the Liebert STS2.
• System Settings — accesses another pop-up menu to configure communication
and system choices and the system ID.
Each of these choices accesses a separate dialog box.
13.7.1 System Ratings
The System Ratings menu is used to set the nominal line frequency, nominal voltage and nominal
current at which the system operates when it is installed. These settings are configured when the
system is initialized at the factory or under maintenance and should not be changed by the user.
13.7.2 Event Masks
The Liebert STS2 gathers, processes and reports faults and alarms, collectively referred to below as
events. The Event Mask dialog box allows you to set the system’s response for specific alarms and
Event Mask for the definitions of the Event Mask types.
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Liebert STS2 Touch Screen Display
To set the event masks:
1. Access the Event Mask dialog box:
a. Select CONFIG.
b. Select EVENT MASK from the pop-up menu.
2. Select the mask settings for each fault and alarm.
a. Select YES to enable the setting,
– or –
b. Select NO to disable the setting.
3. Select SAVE to keep the settings.
Figure 52 Event mask dialog box
13.7.3 User Settings
The User Settings choice allows you to adjust the user-accessible switch settings. Access is limited to
qualified personnel via system security.
To access the User Settings dialog box:
1. Select CONFIG.
2. Select USER SETTINGS from the pop-up menu.
secondary dialog boxes to configure the various settings.
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Liebert STS2 Touch Screen Display
Figure 53 User settings dialog box
Source Set Points
The Source 1/2 Set Points allows you to configure trigger points for each input source (1 or 2) for the
Liebert STS2 via a keypad dialog or HI/LO dialog box. The source numbers do not designate the
source as the preferred or alternate source. The numbers simply identify the input source. See 10.2 -
Manual Transfer / Preferred Source Selection to set the preferred source.
The Set Points are based on values in relation to the nominal voltage required for the Liebert STS2.
UV refers to under voltage, meaning the amount of voltage below the nominal voltage. OV refers to
over voltage, or the amount of voltage over the nominal voltage.
• Fast UV Setting (%) — if the voltage drops below this set percentage of the nominal voltage, the
Liebert STS2 transfers from the current source to the opposite source.
• Slow UV Setting (%) — if the voltage remains this set percentage below the nominal voltage for
the period of the slow detection delay, the Liebert STS2 transfers from the current source to the
opposite source.
• Slow UV detection delay — the number of cycles that the source must remain below the Slow UV
Setting before the Liebert STS2 transfers.
• OV Setting (%) — if the voltage exceeds this set percentage of the nominal voltage for the period of
the OV detection delay, the Liebert STS2 transfers from the current source to the opposite source.
• OV Detection Delay — the number of cycles that the source must remain above the OV Setting
before the Liebert STS2 transfers sources.
• I-PK Xfer Lockout — if current from the source exceeds this threshold, the Liebert STS2 disables
source transfers, and has to be reset either manually or automatically. The type of reset is
configured under the User Settings.
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To configure the setpoints for each source:
1. Select SOURCE 1/2 Set Points from the User Settings dialog box.
The Source 1/2 Set Points dialog is displayed.
Figure 54 Source setpoints
2. Select 1 to configure the settings for Source 1.
3. Configure the settings using the keypad or dialog box that is displayed when you touch a button.
Table 13 Sepoint parameters
Button
Range
Default
Comments
-10 to -30% of Nominal
voltage rating
Fast UV Setting (%)
-20%
Set in increments of 1%.
Slow UV Setting (%)
Slow UV detection delay
OV Setting (%)
-5 to -20%
-10%
Set in increments of 1%.
Units: Line Cycle
1-60 cycles
+5% to +20%
1-255 cycles
5 cycles
+10%
Set in increments of 1%.
Units: 1/4 Line Cycle
OV Detection Delay
3 cycles
I-peak xfer lockout detection point.
Units: Amps RMS. Select the HI or LO
buttons to configure your setting.
0 – 3.0 multiplied by
the unit current rating.
1.5 * Unit
Current Rating
I-PK Xfer Lockout
4. Select 2 for Source 2.
5. Configure the settings, as described in Step 3.
6. Select SAVE to keep the settings for both sources.
The Set Points dialog is closed and the User Settings dialog is displayed.
7. Select MANUAL MAX XFER PHASE ANGLE.
A keypad is displayed.
This setting configures the maximum allowed phase difference between the sources and applies to
all manual transfers as well as any auto retransfer.
a. Configure this setting with a range of ± 1-30 degrees.
The default setting is ±15 degrees and the resolution is 1 deg.
b. Select OK to save the setting.
The setting is now displayed in the adjacent field in the User Settings dialog box.
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8. Select FREQUENCY TRIP POINT.
A keypad is displayed.
This choice verifies that the source is running at the proper frequency. This choice sets the
frequency deviation in the frequency that triggers the frequency trip point alarm. The frequency
deviation setting is the allowable frequency variation from nominal (60.0 or 50.0 Hz) before
activating the frequency deviation alarm. The frequency setting applies to both input sources.
a. Configure this setting with a range of 0.1 – 3.0 Hz
The default setting is 3 and the resolution is 0.1.
b. Select OK to save the setting.
9. Select RETRANSFER DELAY.
A keypad is displayed.
With the secondary source being used, this setting sets the length of time the switch waits until
attempting to transfer back to the preferred source.
a. Configure this setting with a range of 1 to 60 seconds.
The default setting is three (3) seconds and the resolution is 1 second.
b. Select OK to save the setting.
The setting is now displayed in the adjacent field in the User Settings dialog box.
10. Select AUDIO LEVEL.
A dialog box is displayed with HI and LO settings.
This choice sets the loudness of the horn or beeper that is sounded for audible alarms.
a. Configure this setting with a range of 1–10 (ten).
The default setting is 5. The settings have an increment of 1 (one).
b. Select OK to save the setting.
The setting is now displayed in the adjacent field in the User Settings dialog box.
You can select TEST to briefly sound the alarm to judge its volume.
11. Select DISPLAY BRIGHTNESS.
A dialog box is displayed with HI and LO settings.
This choice sets the brightness for the touch screen.
a. Configure the Contrast and Brightness settings with a range of 1 – 10 (ten).
b. Select OK to save the settings.
12. Set the AUTO REXFER ENABLE choice.
The auto retransfer enable setting determines whether the switch automatically returns the
preferred source after that source is restored.
• Select YES to enable the automatic transfer.
• Select NO to disable the automatic transfer. The setting requires transfers be done manually.
13. Set the AUTO RESTART ENABLE choice.
This setting determines whether the Liebert STS2 can be started automatically when power is
restored after it has been lost.
• Select YES to enable the automatic restart.
• Select NO to disable the automatic restart. This settings requires a manual restart of the
Liebert STS2.
14. Select a setting for the I-PEAK RESET.
• Select AUTO to configure the Liebert STS2 to automatically reset when a fault clears and the
voltage and current are normal.
• Select MAN to require a manual reset of the Liebert STS2 when fault clears and the voltage
and current are normal.
• The default setting is Manual.
CAUTION
!
Risk of equipment damage and personnel injury.
Use of Auto Restart is site specific. Do not enable auto restart unless the infrastructure is
designed for unattended operation and there is no chance of equipment or personnel harm by
automatic re-energizing of the system.
Consult with your Emerson site engineer as to whether Auto restart should be enabled.
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13.7.4 System Settings
The System Settings choice under the Config menu displays another pop-up menu with three choices:
To access the System Settings menu:
1. Select CONFIG from the menu bar.
2. Select SYSTEM SETTINGS from the Config menu.
13.8 Comm Options
The Comm Options dialog box allows you to configure the communications settings for the Liebert
STS2.
Settings to access the System Settings menu.)
• An option can be enabled by selecting YES.
• An option can be disabled by selecting NO.
• An option can be configured by selecting the adjacent option button to display a separate
configuration dialog box.
The instructions for configuring the communications options are provided in this section:
Option
Refer to:
Modem
Pager
Input Contact Isolator
Prog. Relay Board
Site Scan
Modem
Figure 55 Comm options dialog box
Option
buttons
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13.8.1 Configuring the Modem
The Modem dialog box allows you to configure the optional external modem that is connected to the
Liebert STS2.
The dialog box contains a series of choices that access either a keypad or a secondary dialog to
configure settings. Auto dial can also be configured for the modem to be triggered by events, as set up
in the Event Mask choices.
Designated major alarms activate the auto dial modem sequence. Automatic dial attempts are made
to the first number three times, at 30 seconds between attempts. If connection is not established in
that time period, the system automatically rolls over to the second number. Auto dial attempts are
made again three more times at 30 seconds between attempts. The process is repeated until a
successful connection is made. Upon successful connection, the system transmits a present status
data, including all active alarms messages. After transmission, the modem automatically hangs up
and returns to the auto-answer mode.
To configure the modem:
1. Select MODEM from the Comm Options menu.
The Modem dialog box is displayed.
Figure 56 Modem dialog box
2. Select the type of modem that the Liebert STS2 will be using:
• Select INT internal modem not available.
• Select EXT if the Liebert STS2 will be communicating via an external modem.
3. Select the PRIMARY LINE choice to enter the primary telephone number for the modem to dial
when an alarm is triggered.
4. Enter the number in the keypad dialog box.
5. Select OK to save the telephone number. The number is displayed in the field adjacent to the
Primary Line choice.
6. Select the SECONDARY LINE choice to enter the secondary telephone number for the modem to
dial when an alarm is triggered.
7. Enter the number in the keypad dialog box.
8. Select OK to save the telephone number. The number is displayed in the field adjacent to the
Secondary Line choice.
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9. Select INIT. STRING to configure the initialization string.
This string configures the parameters of the modem.
• Check your modem’s documentation for this setting.
10. Select BAUD RATE to display a dialog with the baud rate choices:
• For an external modem, select from 2400 bps, 9600 bps or 19200 bps.
11. Configure the MODEM HEALTH CHECK.
The Health Check verifies that the modem is working properly. This setting allows you to enable
the check and set when it is run.
a. Select the button to display the Modem Health Check dialog box, from which you can access
further dialogs to set the time and days that the check is run.
b. Select SAVE to keep the settings.
The Health Check dialog box is closed and the Modem dialog box is again active.
c. Select YES in the Modem dialog box to activate the Modem Health Check.
If you select NO, the Modem Health Check is not run.
12. Configure AUTO DIAL IN.
Auto Dial In allows a user to dial into the Liebert STS2 through the modem to check status and
access the system via a hyperterminal connection.
a. Select YES to activate the dial in feature.
b. Select NO to deactivate the dial in feature.
13. Configure AUTO DIAL OUT.
Auto Dial Out allows the Liebert STS2 to automatically dial out to a system to notify a user of an
event or status.
a. Select YES to activate the dial out feature.
b. Select NO to deactivate the dial out feature.
14. Select SAVE to keep the modem configuration settings.
15. Select YES in the Comm Options dialog box to activate the settings.
You are returned to the Comm Options dialog box.
13.8.2 Configuring Pager Support
Pager support will be implemented in an upcoming update of the system. This support will trigger the
system to call a pager when specified events occur. This menu choice will allow you to enter the
telephone number and PIN for the pager that you want the system to call.
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13.8.3 Configuring the Input Contact Isolator Settings
The Input Contact Isolator (ICI) is an optional, eight-channel input board for up to eight external user
alarm or message inputs to be routed to the Liebert STS2’s alarm network. If the Transfer Inhibit
option is supplied, the ICI will accommodate up to seven external user alarm or message inputs.
The contact is set to either be normally open or normally closed. When a contact closes or opens, an
The Input Contact Isolator options are configured through the Input Contact Isolator dialog box,
which is accessed from the Comm Options dialog box. The Input Contact Isolator dialog box contains
eight choices to match the eight channel input board. You can label each button to identify the event
associated with the contact. When the dialog box is accessed, each button flashes to display the Input
Contact Isolator number and the user entered label. This label also appears in the Display Panel
when an event related to an Input Isolator Connector is triggered.
The Input Contact Isolator dialog box allows you to:
• Label the input contact assignments for your setup.
• Set the delay for an external event triggering an alarm.
• Review the isolator contact assignments, once the labels are entered.
The delay allows you to set the number of seconds which a condition needs to persist to trigger an
alarm.
These input alarms can also be configured to activate a programmable relay output, which is
When the Transfer Inhibit option is supplied, connect a N.O. dry contact (customer-supplied) to Input
Contact 8 (Pins 15 and 16). When the customer contact closes, transfers will be inhibited as long as
the contact remains closed. Input Contact 8 is factory-set so no setup is required. The Transfer Inhibit
option prevents Input Contact 8 from being used for any other input.
To configure the Input Contact Isolator relays:
1. Select INPUT CONTACT ISOLATOR from the Comm Options menu.
The Input Contact Isolator dialog box is displayed.
Figure 57 Input contact isolator dialog box
2. Select INPUT CONTACT 1.
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A keyboard is displayed to allow you to enter the name of the alarm.
3. Enter the name of the alarm set for that input. For example, a fan problem could be indicated by
naming the button FAN.
4. Select OK on the keyboard to keep your label.
5. Select DELAY.
A keypad is displayed prompting you for a delay time, in seconds, for a condition to exist before
the alarm is triggered.
6. Enter the delay value. The range for the values are from 0 (zero) to 99.9 seconds.
7. Select OK on the keypad to keep your setting.
The value you entered is displayed in the field adjacent to the corresponding input contact.
9. Select SAVE after you have configured all input contacts.
Be sure to select Save even if you have accessed this dialog only to change a setting.
This information is not saved if control power is removed.
11. Select OK in the Comm Options dialog box to activate the settings.
13.8.4 Configuring the Programmable Relay Board Settings
The Liebert STS2 can contain up to two Programmable Relay Boards (PRB) that can trigger an
external device when an event occurs in the Liebert STS2. For example, if Source 1 fails, an external
light flashes.
The Programmable Relay Board dialog box with two options: STANDARD SET and USER DEFINED
SET. The STANDARD SET are the factory-configured settings.
The STANDARD SET for the Programmable Relay Board settings are:
Table 14 Standard settings for programmable relays
Relay
Setting
SOURCE 1 FAIL
Definition
1
2
3
4
5
6
Source 1 failure.
Source 2 failure.
SOURCE 2 FAIL
BYPASS CB4 CLOSED
BYPASS CB5 CLOSED
TRANSFER INHIBIT
OUT OF SYNC
Switch (CB4) is closed, Source 1 is bypassed.
Switch (CB 5) is closed, Source 2 is bypassed.
A transfer between Source 1 and Source 2 is being restrained.
The phase difference between sources 1 and 2 exceeds the
allowable threshold for transfer,
7
8
EQUIP OVER TEMP
blank
The ambient temperature of the Liebert STS2 exceeds the
recommended threshold for operation.
No setting.
The USER DEFINED SET allows you to assign faults and alarms to each contact on the relay boards.
Utilizing the USER DEFINED SET, you can also select Input Contact Isolators to associate with a
programmable relay.
In addition individual events, three other assignment choices are available:
• SELECT ALL sends a summary event to the selected relay whenever any event occurs. If this
setting is selected for a relay, no other event needs to be assigned for that relay.
• ON SOURCE 1 or ON SOURCE 2 can be assigned to a relay to send a notification when that
source is being used by the load.
Once configured, the Liebert STS2 continuously checks the status of the items defined for each
contact and updates the state of the relay.
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To configure your programmable relay boards for user defined settings:
1. Select PROG. RELAY BOARD # x from the Comm Options dialog box, where x is the
corresponding board number.
The Prog. Relay Board dialog box is displayed.
Figure 58 Programmable relay board dialog box
2. Select your configuration settings.
• Select STANDARD SET to use the settings configured at the factory. See Go to step 4.
• Select USER DEFINED SET to configure your own settings. Go to step 3.
If you enter a user-defined setting, record the setting in Programmable Relay Board Settings
Record on page 140. If for some reason the control board is replaced, it will be necessary to
reprogram the Programmable Relay Board with this information.
3. To define your relay board settings:
a. Select a Programming Relay.
b. Select an event you want associated with the relay. That fault is placed in the Relay column.
You can associate up to ten (10) events with one relay. If you do so, you should group the
events logically to simplify troubleshooting when an event is triggered.
4. Select SAVE to keep the settings.
5. Select OK for the applicable Programmable Options Board option in the Comm Options dialog box
to activate the settings.
13.8.5 Configuring the Liebert IntelliSlot SNMP/Web/Modbus 485 Card
An optional Liebert IntelliSlot SNMP/Web/Modbus 485 card can be installed in the Liebert STS2 to
provide Ethernet connectivity via an RJ-45 port.
Ethernet cabling is the responsibility of the customer. Category 5 cabling is required.
IntelliSlot SNMP/Web/Modbus 485 card. See the card’s user guide, SL-52615, for configuration
instructions. The guide is available at the Liebert Web site, www.liebert.com
If the optional Liebert IntelliSlot SNMP/Web/Modbus 485 card is installed in the Liebert
STS2:
• Select YES for the Liebert IntelliSlot SNMP/Web/Modbus 485 card option in the Comm Options
dialog box to activate the card.
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13.8.6 Liebert SiteScan® Configuration
An optional RS-422 port, contained in the Comms Board, can be installed in the Liebert STS2 to
provide communications with Liebert SiteScan. Liebert SiteScan is system monitoring software that
allows you to utilize a PC to monitor the Liebert STS2’s status and check alarms. See 6.5 - Comms
Board for more information on this board.
If the Liebert STS2 will be connected to Liebert SiteScan:
• Select YES for the Liebert SiteScan choice in the Comm Options dialog box to activate the card.
13.8.7 Saving Your Communications Configurations
To save you communications configuration settings:
1. When you have completed the Comm Options configurations, ensure you have selected YES for all
the settings that you want activated.
2. Select SAVE to keep the settings.
Whenever you make modifications to the any of the Comm Options, select SAVE to keep the changes.
13.9 System Options
Most System Options are configured at the factory. However, you may need to set two of the choices
after the unit is installed: Wye Output Transformer and Remote Source Selection.
Settings to access the System Settings menu.)
The System Options dialog box is displayed.
• An option is enabled by selecting YES.
• An option is disabled by selecting NO.
Figure 59 System options
Dual Output Breaker
This selection is set at the factory. The choice is set to YES to enable both output breakers (CB3 and
CB3A) when two are installed in the unit. If only one output breaker (CB3) is installed, the setting is
set to NO.
PDU
This selection is set at the factory. This setting allows the LCD to draw the Mimic accordingly and
display PDU specific metering and alarm information.
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4-Pole Transfer Switch
This option is not available (factory-set to No).
Shunt
This selection is set at the factory.
Wye Output Transformer
The Wye Output Transformer controls the firing of the SCRs on startup, which minimizes the inrush
into PDU transformers. Output breakers and PDU input breakers have to be closed when you start
up the system. Based on whether the input side of the PDU transformer is configured as a Wye or
Delta changes the firing sequence of the SCRs.
If the Liebert STS2 is connected to a PDU configured as a Wye:
• Select YES for the Wye Output Transformer choice in the System Options dialog box.
Remote Source Selection
If your system is configured with the optional Remote Source Selection, it must be enabled from the
If the system is utilizing Remote Source Selection:
• Select YES for the Remote Source Selection choice in the System Options dialog box to activate
the option.
13.10 System ID
Most of the settings for System ID are set by Emerson either at the factory or when the unit is
installed.
Order No., System Tag No., System ID No. and Model No. are the numbers used to identify and track
the system.
Language, Time and Date are synchronized with the location of the unit.
information on configuring and using the password.
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13.11 Logs
Two types of logs are kept by the Liebert STS2: Event Log and History Log.
13.11.1Event Log
The Event Log tracks the alarms and faults of the Liebert STS2.
more information on the Event Log and definitions of the fields displayed in the Event Log screen.
Figure 60 Event log
To use the Event Log:
1. Select LOGS from the menu bar to open the Logs menu.
2. Select EVENT LOG from the menu.
3. Use the UP and DOWN buttons to scroll through the event list.
4. Select OK to close the Event Log. The data remains in the log.
13.11.2History Log
Two History Logs are available to track major alarms. If so configured, an alarm freezes the history
buffer. When the History Status buffer is frozen, a History Log is created that can be accessed from
the HISTORY LOG x choices in the LOGS menu.
displayed in the History Log screen.
Figure 61 History log
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To use the History Log:
1. Select LOGS from the menu bar to open the Logs menu.
2. Select either HISTORY LOG 1 or HISTORY LOG 2 from the menu.
3. Select the appropriate buttons to replay the log:
• Select PREV to go to the previous frame in the sequence.
• Select NEXT to go to the next frame in the sequence.
• Move the green cursor to the location from which you would like to play the sequence of
events.
• Select REPLAY to play the frames automatically from the point of the cursor.
• Select STOP to halt the replay.
• Select RESET to return to the first frame in the log.
4. Select EXIT to close the History Log. The data remains in the log.
• Use CLEAR HLOGS to remove the data from both history logs.
NOTE
Event and History Logs are protected by security. The password or a disabled key lockout is
required on such equipped units to clear these logs.
13.12 Source Transfers
The Source Transfer choice (SOURCE XFERS) allows you to manually select a preferred source.
To switch the primary source, refer to the instructions in 10.2 - Manual Transfer / Preferred
13.13 Startup Procedure
You can access instructions for starting the Liebert STS2 from the menu bar.
• From the menu bar, select STARTUP PROC.
13.14 Bypass Procedure
You can access instructions for bypassing the static transfer switch from the menu bar.
• From the menu bar, select BYP. PROC.
The instructions are provided in the display panel.
13.15 Help
You can select an event in the Event Display to display more information about that event in the
13.16 Logo
The Logo menu choice shows the Emerson logo in the Display panel.
13.17 Cleaning the LCD Touch Screen
If the touch screen requires cleaning, use a pre-moistened towelette designed for cleaning CRTs, or
dampen a soft, non-abrasive cloth with a very mild cleaning solution.
Do not spray the cleaner directly onto the touch screen, as drips may run down into the screen and
damage the equipment.
Close all menus and dialog boxes before cleaning the touch screen.
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14.0 OPERATING THE LIEBERT STS2 LED DISPLAY
Certain models of the Liebert STS2 do not include the LCD Color Graphical Display with the touch
screen interface. This display is replaced by an LED front panel to allow you to monitor the unit and
alert you when a problem occurs. The LED panel can be replaced with the Color Graphical Display, if
You can use a PC running terminal emulation software connected to the RS-232 port to access the
data and configuration settings that are available in the Color Graphical Display touch screen.
14.1 LEDs and Buttons and Key Lockout Switch
The LED Display unit is monitored and controlled through a series of LEDs and buttons and an
optional key lockout switch. This section includes illustrations of the LEDs, buttons and key lockout
switch, plus tables providing definitions of these components.
14.1.1 Front Panel Controls
The front panel contains the LEDs to monitor the Liebert STS2, plus selection buttons to choose the
Figure 62 LED display
(E)
1
4
1
(A)
(H)
(C)
3
(J)
(G)
3A
2
2
(B)
(D)
(F)
5
(L)
!
(K)
(M)
(N)
PS211002
Rev. 0
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14.1.2 LED and Push Button Description
The following table defines the LEDs and push buttons in the LED display:
Table 15 LED and push button description
Symbol LED
Description
Action
A green LED is lit if the Source 1 input power is present. This LED
only indicates that power is present to the power supply; it does not
indicate if the power is within the programmed tolerances of the unit.
A
B
Green
Source 1 power is present
A green LED is lit if the Source 2 input power is present. This LED
only indicates that power is present to the power supply; it does not
indicate if the power is within the programmed tolerances of the unit.
Green
Source 2 power is present
A green LED is lit if Source 1 power is within the programmed
tolerance for all phases.
C
D
Green
Green
Source 1 within tolerance
Source 2 within tolerance
A green LED is lit if Source 2 power is within the programmed
tolerance for all phases.
E
F
Green
Green
Source 1 SCRs on
Source 2 SCRs on
A green LED is lit when the SCRs for Source 1 are closed.
A green LED is lit when the SCRs for Source 2 are closed.
A yellow (amber) LED is lit when source transfers are inhibited
(locked out) by a hardware condition. Connect a PC terminal to the
Liebert STS2 to locate the exact cause. See 12.0 - Communication
Interfaces for PC terminal commands.
G
Yellow
Source transfer inhibited
Push button to select Source 1 A green LED is lit if the button has been pushed to set Source 1 as
as the preferred source the preferred source.
H
I
Green
Green
Green
Push button to select Source 2 A green LED is lit if the button has been pushed to set Source 2 as
as the preferred source
the preferred source.
A green LED is lit to indicate that power is present on the output
load.
J
Output power is present
Push this button to turn off the horn that is sounded for an alarm.
This button does not reset an alarm condition, unless pushed
simultaneously with “M” button.
K
L
Alarm silence button
Symbol to indicate the K and M
must be pushed at the same
time to reset alarm
Push this button simultaneously with the “K” button to reset an alarm
condition. An alarm can only be reset if the hardware condition
permits a reset.
M
Alarm reset push button
A red LED is lit when an alarm condition is present in the Liebert
STS2.
Connect a PC terminal to the Liebert STS2 to locate the exact
commands.
N
1
Red
Alarm present
CB1 closed
A green LED is lit if CB1 is closed, indicating power is flowing to the
static transfer switch from Source 1.
Green
A green LED is lit if CB2 is closed, indicating power is flowing to the
static transfer switch from Source 2.
2
3
Green
Green
Green
CB2 closed
CB3 closed
CB3A closed
A green LED is lit if the output breaker/switch is closed.
A green LED is lit if the output breaker/switch is closed. CB3A is
installed on units with dual output breakers.
3A
4
5
Yellow
Yellow
CB4 closed
CB5 closed
A yellow LED is lit if the Source 1 bypass breaker/switch is closed.
A yellow LED is lit if the Source 2 bypass breaker/switch is closed.
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14.1.3 Event Controls
When an alarm is triggered, a red LED is lit in the control panel. A pair of buttons allows you to turn
off the horn and reset the alarm.
14.1.4 Key Lockout Switch
An optional key lockout switch for the Liebert STS2 enables or disables all push button inputs, except
for the alarm silence button. The key lockout switch is mounted on the front of the unit. See
• To disable the buttons, turn the key to the top of the switch, toward the closed padlock icon.
• To enable all of the buttons, except the alarm silence, turn the key to the horizontal position,
toward the open padlock icon.
Figure 63 Key lockout switch.
Changes disabled
Changes enabled
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14.2 Operations
This section discusses the system startup, shutdown and bypass procedures for the LED-based
Liebert STS2.
If your unit has an LCD touch screen, see10.0 - Operating Instructions for the Touch Screen
Interface for instructions these procedures.
14.2.1 Normal System Startup
NOTE
If your Liebert STS2 is connected to a PDU with a Wye configuration, enable the Wye Output
Transformer before starting the system. This configuration can be done from a PC terminal.
This section provides instructions to start up the Liebert STS2. The LEDs provide the basic
information required to ensure proper operation. To monitor metering data, use a PC terminal.
1. Ensure that all Liebert STS2 breakers—CB1, CB2, CB3A (if supplied), CB3, CB4, and CB5—are
in the OFF (open) position.
a. Ensure that the key interlocks for CB1 and CB2 have their bolts retracted.
b. Ensure that the key interlocks for CB4 and CB5 have their bolts extended, thus preventing
CB4 or CB5 from being turned ON.
c. Ensure that the circuit breakers respective LEDs are off.
2. Source/input power should be applied to both Liebert STS2 inputs.
Check that the green LEDs for each source are lit.
3. Verify that nominal input voltages are applied to both inputs (Source 1 and Source 2).
Check that the green LEDs monitoring the sources are lit indicating the sources are within
acceptable tolerances.
NOTE
For redundant output switch units, CB3 descriptions apply to CB3 and CB3A.
4. Close CB1.
The green LED monitoring CB1 turns on.
5. Close CB2.
The green LED for CB2 turns on.
6. Verify that the preferred source LED (green) (LED_PREFx) is lit for the source that you want the
switch to be using.
7. Verify that the green LED for the corresponding SCR (Liebert STS1 or Liebert STS2) is lit,
indicating that the SCR is closed.
8. Close Output Breaker CB3 (and CB3A in a redundant output configuration).
9. Verify that CB3 LED is lit, indicating that CB3 is closed and the output and load are energized.
• In a redundant output configuration, verify the CB3A LED is lit, indicating that CB3A is
closed and the output and load are energized
10. Press the Reset and Silence buttons simultaneously to reset any previous alarms.
11. Verify that no red or yellow (amber) LEDs are lit indicating an active alarm, transfer is inhibited
or a bypass circuit breaker is closed.
If the alarm LED remains lit, check the PC terminal to identify the alarm. Refer to 11.0 - Alarm
and Faults for a description of the alarms and possible causes. All active alarm conditions should
be corrected before proceeding.
12. If the unit is supplied with an output distribution cabinet, close output breakers as required.
13. Turn on the load equipment following the load equipment manufacturer’s recommendations.
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Operating the Liebert STS2 LED Display
14.2.2 Manual Transfer / Preferred Source Selection
The preferred source buttons allow you to change the preferred source. Transfers are only permitted
when the voltage and current are within their proper operating range and the sources are
synchronized. Transfer is inhibited if the deviation exceeds the parameter set in the Source Set
Points.
NOTE
If one source will be de-energized for an extended period (hours or days), set the unit to bypass
mode for the remaining source. Without using bypass, if a failure occurs in the switch
components for remaining source, the Liebert STS2 does not have a second source to switch to
bypass instructions.
To manually select the preferred source:
1. Ensure that the Transfer Inhibit (NOXF) LED is not lit.
If the Transfer Inhibit LED is lit:
• Check to see if the red alarm LED is lit.
• If the alarm LED is lit, check the alarm messages on a PC terminal.
• Correct alarm conditions before attempting a source transfer.
NOTE
When the remote source selection option (Remote Control) is activated, a change of state
(Remote Preferred Source Selection) may initiate a transfer if the appropriate contacts are
closed.
2. Verify that the LEDs are lit for both sources, indicating power is present and within acceptable
tolerances.
3. Verify that the LEDs for the SCRs (Liebert STS1 and Liebert STS2) are lit.
4. Verify that the input breakers CB1 and CB2 are closed.
• Verify that their respective LEDs are lit.
The Preferred Source (LED_PREFx) LED turns on for that source.
When conditions are correct, the switch transfers the load to the alternate source by selecting the
alternate source as the preferred source.
This source is now monitored as the preferred source throughout the various configurations set up
through the PC terminal.
6. Check the LEDs to verify that the correct source is designated as the preferred source and that
the input source changes to the desired source and the output (OUT) LED remains lit.
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Operating the Liebert STS2 LED Display
14.2.3 Maintenance Bypass
The Liebert STS2 is equipped with two key-interlocked, bypass breakers, CB4 and CB5, to allow
manual bypass of the switch electronics for either input source in the event of switch failure or for
operating on maintenance bypass, all voltages are removed from the Liebert STS2 electronics to
facilitate safe repair, without de-energizing the load using a make-before-break switching sequence.
However, the unit can be bypassed using a make-before-break switching sequence only to the same
source to which that the switch is connected.
In the event of source or switch failure, the unit should be bypassed only to the current input source.
The LED display is used to verify the status of the unit during the bypass procedures. In the unlikely
event that the LED display is not available, open the front door and look through the slots in the
control door. If you can see green LEDs on the gate driver board through that slot, then the unit is
Bypass Procedures for Source 1
To bypass the switch for Source 1:
NOTE
To bypass the Source 1 static transfer switch when Source 2 is presently active, you must first
1. Verify that Source 1 is supplying power via the LED display.
• If the LED Display is not available, check the gate driver board LEDs through the slots in the
2. Remove the interlock key from CB5 and place it in the CB4 interlock.
3. Open the alternate source input breaker CB2.
Verify that CB2 LED is off.
4. Rotate and remove the CB2 interlock key.
5. Insert the key in the CB4 bypass breaker interlock.
6. Rotate the interlock keys in the CB4 bypass breaker interlock to retract the interlock.
7. Close bypass breaker CB4.
Verify that CB4 LED is on.
8. Open source input breaker CB1.
Verify that CB1 LED is off.
9. Rotate the CB1 interlock key and remove it to lock out the breaker.
10. Secure the key according to your site’s lockout/tagout procedure.
11. Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch
from the load.
Verify that CB3 and CB3A LEDs (if supplied) are off.
12. Verify that the output LED is on.
Power is now flowing directly from the source to the load, without passing through the static transfer
switch.
To return to normal mode:
1. Verify that the LED for Source 1 is on, indicating that the source is supplying power and is
operating within acceptable tolerances.
2. Insert the key in the CB1 breaker interlock.
3. Rotate the key to retract the interlock.
4. Close source input breaker CB1.
Verify that CB1 LED is on.
5. Select the SOURCE 1 button in the SOURCE XFERS menu.
6. Close output breakers CB3 and CB3A (if supplied).
Verify that CB3 and CB3A LEDs are on.
7. Verify that STS SOURCE 1 and OUTPUT LEDs are on.
8. Open bypass breaker CB4.
Verify that CB4 LED is off.
9. Rotate the keys in the CB4 interlock to extend the interlock.
10. Remove the proper key from the CB4 interlock and insert it in the CB2 breaker interlock.
11. Rotate the key to retract the CB2 breaker interlock.
12. Close source input breaker CB2.
Verify that CB2 LED is on.
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Operating the Liebert STS2 LED Display
Bypass Procedures for Source 2
To bypass the switch for Source 2:
NOTE
To bypass the Source 2 static transfer switch when Source 1 is presently active, you must first
1. Verify that Source 2 is supplying power via the LED display.
• If the LED Display is not available, check the gate driver board LEDs through the slots in the
2. Remove the interlock key from CB4 and place it in the CB5 interlock.
3. Open the alternate source input breaker CB1.
Verify that CB1 LED is off.
4. Rotate and remove the CB1 interlock key.
5. Insert the key in the CB5 bypass breaker interlock.
6. Rotate the interlock keys in the CB5 bypass breaker interlock to retract the interlock.
7. Close bypass breaker CB5.
Verify that CB5 LED is on.
8. Open source input breaker CB2.
Verify that CB2 LED is off.
9. Rotate the CB2 interlock key and remove it to lock out the breaker.
10. Secure the key according to your site’s lockout/tagout procedure.
11. Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch
from the load.
Verify that CB3 and CB3A LEDs (if supplied) are off.
12. Verify that the output LED is on.
Power is now flowing directly from the source to the load, without passing through the static transfer
switch.
To return to normal mode:
1. Verify that the LEDs for Source 2 are on, indicating that the source is supplying power and is
operating within acceptable tolerances.
2. Insert the key in the CB2 breaker interlock.
3. Rotate the key to retract the interlock.
4. Close source input breaker CB2.
Verify that CB2 LED is on.
5. Select the SOURCE 2 button in the SOURCE XFERS menu.
6. Close output breakers CB3 and CB3A (if supplied).
Verify that CB3 and CB3A LEDs are on.
7. Verify that STS SOURCE 2 and OUTPUT LEDs are on.
8. Open bypass breaker CB5.
Verify that CB5 LED is off.
9. Rotate the keys in the CB5 interlock to extend the interlock.
10. Remove the proper key from the CB5 interlock and insert it in the CB1 breaker interlock.
11. Rotate the key to retract the CB1 breaker interlock.
12. Close source input breaker CB1.
Verify that CB1 LED is on.
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Operating the Liebert STS2 LED Display
14.2.4 Normal System Shutdown
The Liebert STS2 can be shut down from either the static switch mode or the bypass mode.
Shutdown in Static Transfer Switch Mode
When the Liebert STS2 is operating in static transfer switch mode (not maintenance
bypass mode):
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open CB3 to turn off the static switch output.
• Open CB3A if the static transfer switch is a redundant output configuration.
The LEDs for CB3 and CB3A (if supplied) and the output (OUT) are turned off.
3. Open the input switches CB1 and CB2.
The LEDs for CB1 and CB2 are turned off.
4. To completely de-energize the unit, turn OFF the power to both inputs to the Liebert STS2.
Shutdown in Maintenance Bypass Mode
When the Liebert STS2 is operating on bypass:
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open the bypass switch (CB4 or CB5) to turn off the Liebert STS2 output.
The LED for the bypass switch is turned off.
The output (OUT) LED is turned off.
3. To completely de-energize the unit, turn OFF the power to both inputs to the Liebert STS2.
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Specifications
15.0 SPECIFICATIONS
This section provides the specifications for the Liebert STS2.
15.1 System Configuration
The Liebert STS2 can be set in several different configurations, according to the model and location.
The configuration is set at the factory and does not need to be changed by the customer. These
configurations apply to both units, the Color Graphical Display and an LED Display.
15.1.1 Frequency
The Liebert STS2 accepts input frequencies of 50 Hz and 60 Hz. The frequency shall be within
± 0.5Hz of the nominal frequency.
15.1.2 Input/Output Voltage
The Liebert STS2 models are available to handle various voltages.
The input voltage must be three-phase AC (3 or 4 wire-plus-ground). The Liebert STS2 is designed to
accept an input neutral from each source. The neutral is switched in the 4-pole Liebert STS2 only.
The voltage shall be within ± 10% of the nominal voltage.
The output voltage shall be three-phase AC (3 or 4 wire-plus-ground). Nominal output voltage shall
be same as input voltage.
The following table provides nominal voltages, listed according to frequency.
Table 16 Input/output voltage
60Hz
50 Hz
[L-L/L-N]
200/115V
208/120V
220/127V
240/139V
380/220V
400/230V
415/240V
480/277V
600/346V
[L-L/L-N]
200/115V
208/120V
220/127V
240/139V
380/220V
400/230V
415/240V
15.1.3 System Current Ratings
These ratings are based upon continuous switch current rating. These ratings are for all voltages and
frequencies. All units are 100% continuous current rated.
Table 17 System current ratings
Current
100
250
400
600
800
1000
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Specifications
15.1.4 Grounding
15.1.5 Electrical Requirements
Table 18 Electrical requirements
Item
Requirement
Maximum Continuous Current
Load Power Factor Range
Load Crest Factor
100, 250, 400, 600, 800, 1000 amps
0.75 to 1.0, leading or lagging
Up to 3.5
Source Voltage Distortion
Up to 10% THD with notches and ringing transients
125% for 30 minutes 100A-400A
125% for 10 minutes 600A-1000A
150% for 2 minutes
Overload Capability
500% for 0.25 sec.
Table 19 Unit short circuit withstand capability
Unit Voltage
Unit Amps
100-250A
400-600A
800-1000A
100-250A
400-600A
800-1000A
100-250A
400-600A
800-1000A
Withstand Capability
125kA
150kA
100kA
100kA
100kA
65kA
208-240V
380-480V
600V
50kA
25kA
25kA
15.1.6 Input Surge Suppression
The Liebert STS2 is equipped with transient voltage surge suppression on each input for maximum
surge suppression. The surge suppression is capable of protecting the Liebert STS2 from operating
outside of tolerances due to surges as defined by IEC 1000-4-5 (1.2/50uS surge, 2kV CM and 1kV DM)
as required under EN 50091-2.
15.1.7 Response Time
A dual level fast/slow transfer threshold is used for under voltage detection to allow the Liebert STS2
to be compatible with UPSs and generators. The voltage thresholds and the slow transfer delay time
is user-adjustable. The fast transfer delay time is less than 4 ms.
The over voltage detection uses a single threshold, with programmable level and delay time.
15.1.8 Environmental Requirements
Liebert STS2.
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Specifications
15.2 System Components
All Liebert STS2 models provide two static transfer switches within one enclosure, with the ability to
transfer between two input sources to a single output.
All Liebert STS2s are configured with either an LCD Color Graphical Interface touch screen display
or LEDs for monitoring and configuring the unit.
This section lists the common components and the differences for both types of units.
15.2.1 Frame and Enclosure
The complete Liebert STS2 is housed in a freestanding enclosure. The cabinet is a NEMA type 1
enclosure and meets IP20 requirements. The cabinet is structurally designed to handle lifting from
the base. The frame is designed to accommodate floor stands.
Table 20 Frame sizes
Rating
Width
Depth
Height
100 – 250A 3 pole
400 – 600A 3 pole
800 – 1000A 3 pole
30 in (76 cm)
38 in (96 cm)
84 in (213 cm)
32 in (81 cm)
32 in (81 cm)
32 in (81 cm)
76.77 in (195 cm)
76.77 in (195 cm)
76.77 in (195 cm)
The distributed floor weight for Liebert STS2 is less than 150 lbs./sq. ft. (660kg/m²).
The required service access is only from the front of the unit.
The Liebert STS2 can be tipped 15° in any direction without falling over.
15.2.2 Casters, Leveling and Seismic Anchoring
The frame includes heavy-duty swivel casters for ease of installation, plus permanent leveling feet for
final installation.
The unit also can be fastened to the floor using optional seismic anchors to meet seismic Zone 4
details for installing seismic anchoring.
15.2.3 Cooling
The Liebert STS2 100 – 600A units utilize convection air cooling for the enclosure with forced air
cooling of the heat sinks. The 800-1000A units are fan cooled using low-velocity fans to minimize
audible noise. All fans are redundant so that a single fan failure cannot cause temperatures to
increase beyond acceptable limits.
Air intake is through screened protective openings in the front of the unit. A standard furnace filter is
installed behind the openings.
By opening the front door, the filter can be changed easily without exposing personnel to high voltage.
The size of the filter is 1 in. x 25 in. x 25 in. (2.54 cm x 63.5 cm x 63.5 cm).
The air exhaust is through the top of the unit.
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Specifications
15.2.4 Access
The Liebert STS2 is designed so all repairs and maintenance can be done from the front or top of the
unit. All components that may need repair or replacement during routine field maintenance are
safely accessed with the units in bypass without removing power from the unit. These components
include:
• All electronic PCB assemblies
• Power supply assemblies
• All fuses
• All circuit breaker plug-in modules
• Fans
• SCRs
All power connections are designed to maintain proper connection torque over the lifetime of the unit
without any maintenance. The integrity of the connections can be checked via infrared scanning
safely from the front or top of the unit.
All other components including power cables and connections, circuit breaker bases, etc. are
replaceable from the front or top of the unit only, but this requires all power to be removed from the
unit for safety. Although routine re-torquing of the power connections is not required, if maintenance
of these connections is needed, complete removal of power is required from the unit for safety reasons.
WARNING
personnel should perform maintenance on the static switch.
!
Lethal voltages exist inside the unit during normal operation. Only qualified service
The unit is supplied by more than one power source. The unit contains hazardous voltages if
any of the input sources is ON, even when the unit is in bypass. To isolate the unit, turn OFF
and lock out ALL input power sources.
Verify that all input power sources are de-energized and locked out before making connections
inside unit.
15.2.5 Circuit Breakers
The Liebert STS2 is equipped with five molded-case, plug-in, non-automatic circuit breakers. The
breakers are UL-listed for use up to 600 VAC and CE-marked. The plug-in feature of the breaker
includes an interlock, which prevents the breaker from being unplugged without being in the OFF
(open) position.
Mechanical interlocks are provided on the breakers to prevent improper maintenance bypassing of
the solid-state switch. A bypass breaker cannot be closed unless the solid-state switch is connected to
the same input source and only one bypass breaker can be closed at a time. All breakers are equipped
with N.O. and N.C. auxiliary switches for monitoring of the breaker positions. The two input breakers
for the solid-state switching devices also are equipped with 48 VDC shunt trips to allow for control by
15.2.6 Cable Entrance
Removable conduit termination plates are provided in the top and bottom of the Liebert STS2 for
termination of the two source input conduits or raceways and/or the output conduits or raceways.
15.2.7 Doors
A removable key lock hinged front door provides access to the circuit breakers.
15.2.8 Color Graphical Display or LED Display
The display is located in the front of the unit. Front panel display is either an LCD touch screen
display for monitoring and configuring the unit, or an LED panel to monitor the unit’s status.
display.
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Specifications
15.2.9 RS-232 Port
port’s location.
15.2.10 Terminal Port Connections
The system has an asynchronous serial port configured as Data Terminal Equipment for terminal
access only (half duplex). The CPU services the terminal port with no handshaking. The serial port
conforms to RS-232 levels with a data format of 9600 Baud, 1 start bit, 8 data bits, and no parity bits.
The serial port is 1000VDC isolated (non-SELV) and ESD protected to 15kV air discharge. The
connector is a 6 Pin MTA plug with connections shown below.
Table 21 MTA plug pinout
Pin
1
Signal Name
ISO_GND
Function / Comments
Isolated service terminal ground
2
ISO_TXD
ISO_RXD
NC
Isolated service terminal transmit output
Isolated service terminal receive input
No Connection
3
4
5
NC
No Connection
6
NC
No Connection
A DB9 male connector is added and connected parallel to the 6 position header. It is configured as
DTE.
Table 22 DB9 pinout
Pin
1
Signal Name
Function / Comments
NC
No Connection
2
ISO_RXD
ISO_TXD
NC
Isolated service terminal transmit output
Isolated service terminal receive input
No Connection
3
4
5
ISO_GND
NC
Isolated service terminal ground
No Connection
6
7
NC
No Connection
8
NC
No Connection
9
NC
No Connection
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Specifications
15.2.11 RS-232 Interface Parameters
The service terminal interface parameters are the following settings and cannot be changed.
Table 23 RS-232 settings
Parameter
Setting
Interface
Baud Rate
Parity
RS-232 Using EIA Voltage Levels
9600
None
Number of Data Bits
Number of Stop Bits
Hardware Flow Control
Terminator
8
1
Off
<CR> <LF>
Not supported
Full duplex
Off
Handshaking
Structure
Local Echo
15.2.12 Maintenance Bypass
The Liebert STS2 is configured to allow the unit’s electronics to be bypassed to either input source for
maintenance without interruption of power to the load.
The Liebert STS2 is furnished with key-interlocked maintenance bypass breakers to configure the
bypass.
Liebert STS2 units have all electronics isolated from the input, output, and bypass connections to
allow safe servicing of any components without access to hazardous voltages when the unit is in
maintenance bypass.
15.2.13 Fuseless Design
All Liebert STS2 units are fuseless and are UL rated for use with upstream circuit breakers only.
15.2.14 Options
The following options are available for the Liebert STS2:
Programmable Relay Board
Remote Source Selection
Key Lockout Switch
Optimized Transfer
Distribution Cabinet With I-Line Panelboard
Input Contact Isolator Board
Redundant Output Breaker
Transfer Inhibit
Comms Board w/Liebert SiteScan and Modem Interface
Liebert IntelliSlot SNMP/Web/Modbus 485 Card
LED Display
Input Junction Boxes and Cable
Seismic Floor Anchors
Seismic Floor Stand - 18", 24", 30" and 36"
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Event Message Help Text
16.0 EVENT MESSAGE HELP TEXT
Key:
ALL CAPS = event message displayed in the Event Display panel in the lower left corner of the LCD display.
Indented text = help text shown in the Display Panel in the lower right corner of LCD display.
BOLD = commands that are sent through the RS-232 port.
S1 SCR SHORT
Source 1 SCR Short.
One or more of the SCRs for Source 1 has shorted. Transferring between sources has been inhibited.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
S2 SCR SHORT
Source 2 SCR Short.
One or more of the SCRs for Source 2 has shorted. Transferring between sources has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
S1 SCR OPEN
Source 1 SCR Open.
One or more SCRs on Source 1 is open. Transferring between sources has been inhibited.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Liebert STS2 output has been transferred to Source 2.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
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Event Message Help Text
S2 SCR OPEN
Source 2 SCR Open.
One or more SCRs on Source 2 is open. Transferring between sources has been inhibited.
Liebert STS2 output has been transferred to Source 1.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
PRIMARY FAN FAIL
Primary Fan Failure.
One of the primary cooling fans for the Liebert STS2 has failed. The alternate fans are now running. The alternate fans are
not monitored.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
CONTROL MODULE FAIL
Control logic module has failed.
One of the control modules on the control board has failed.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
PWR SPLY DC A FAIL
Power Supply DC Bus A Failed.
The primary power supply is no longer providing DC power to the control board and the touch screen.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
PWR SPLY DC B FAIL
Power Supply DC Bus B Failed.
The secondary power supply is no longer providing DC power to the control board and CAN options.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
PWR SPLY S1 AC FAIL
Power Supply Source 1 AC Failed.
The AC input power to the power supplies from Source 1 has failed. The power supplies are now operating on AC power
from Source 2. The AC input from Source 1 is still good.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
PWR SPLY S2 AC FAIL
Power Supply Source 2 AC Failed.
The AC input power to the power supplies from Source 2 has failed. The power supplies are now operating on AC power
from Source 1. The AC input from Source 2 is still good.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
PWR SPLY LOGIC FAIL
Power Supply Module Failed.
The power supply logic module contained in the primary power supply has failed.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, is so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
OUT VOLT SENSE FAIL
Output Voltage Sense Module Failed.
The module contained on the snubber monitoring the output voltage has failed.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
S1 VOLT SENSE FAIL
Source 1 Voltage Sense Module Failed.
The module contained on the snubber monitoring the input voltage from Source 1 has failed.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S2 VOLT SENSE FAIL
Source 2 Voltage Sense Module Failed.
The module contained on the snubber monitoring the input voltage from Source 2 has failed.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2 system from a
terminal, type CA and press RETURN on your keyboard.
S1 SCR SENSE FAIL
Source 1 SCR Sense Module Failed.
The module contained on the snubber monitoring the SCRs for Source 1 has failed.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2 system from a
terminal, type CA and press RETURN on your keyboard.
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Event Message Help Text
S2 SCR SENSE FAIL
Source 2 SCR Sense Module Failed.
The module contained on the snubber monitoring the SCRs for Source 2 has failed.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2 system from a
terminal, type CA and press RETURN on your keyboard.
S1 CURR SENSE FAIL
Source 1 Current Sense Failure.
The module monitoring the current from Source 1 has failed. This module is contained on the left side gate driver board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Events Log, is so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2 system from a
terminal, type CA and press RETURN on your keyboard.
S2 CURR SENSE FAIL
Source 2 Current Sense Failure.
The module monitoring the current from Source 2 has failed. This module is contained on the right side gate driver board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Events Log, is so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2 system from a
terminal, type CA and press RETURN on your keyboard.
S1 GATE DRIVE FAIL
Source 1 Gate Drive Failure.
The gate drive module for an SCR for Source 1 has failed. This module is contained on the right side gate driver board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2 system from a
terminal, type CA and press RETURN on your keyboard.
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Event Message Help Text
S2 GATE DRIVE FAIL
Source 1 Gate Drive Failure.
The gate drive module for an SCR for Source 2 has failed. This module is contained on the left side gate driver board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INTERNAL COMM FAIL
Internal CAN Communications Failed.
Communications have failed in the CAN bus between the control board and the touch screen control.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
EXTERNAL COMM FAIL
External Communications Failed.
Communications have failed between the control board and the CAN options.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the unit from a
terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
CB1 SHUNT TRIP FAIL
Circuit Breaker 1 Shunt Trip Failure.
Circuit Breaker 1 failed to trip open when the control issued a command for the circuit breaker to trip.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
CB2 SHUNT TRIP FAIL
Circuit Breaker 2 Shunt Trip Failure.
Circuit Breaker 2 failed to trip open when the control issued a command for the circuit breaker to trip.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
Contact Liebert Services for technical support at 1-800-LIEBERT (800-543-2378).
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
HEAT SINK OVERTEMP
Heat Sink Over Temperature.
The system heat sink temperature has exceeded the design limits.
Take immediate steps to cool the unit. Remove obstructions from the air inlet in the front of the unit. Remove and replace
the air filter behind the front door. A standard furnace filter can be used.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
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Event Message Help Text
S1 UV
Source 1 Under Voltage (fast detection).
The input voltage from Source 1 dropped below a set percentage of the nominal voltage, as set in the Fast UV set point
under the User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 2.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S1 UV (RMS)
Source 1 Under Voltage (slow detection).
The input voltage from Source 1 remained below a set percentage of the nominal voltage for a designated period, as set in
the Slow UV Setting and Slow UV Detection Delay set points configured under the User Settings. An S1 Fail alarm was
also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 2.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The alarm is latched and must be reset after the voltage returns to the nominal voltage. If the Reset option is not configured
for AUTO (automatic reset), then the reset action must be done manually. When the voltage is within acceptable
parameters, touch the RESET button on the touch screen. If you are accessing the unit from a terminal, type CA and press
RETURN on your keyboard.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
S1 OV
Source 1 Over Voltage.
The input voltage from Source 1 exceeded a set percentage of the nominal voltage, as set in the OV Setting and OV
Detection Delay set points configured under the User Settings. An S1 Fail alarm was also issued and source transfer has
been inhibited.
The load of the Liebert STS2 has been transferred to Source 2.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
S1 OF/UF
Source 1 Over Frequency/Under Frequency.
The frequency for Source 1 is running outside the acceptable operating range, as set in the Frequency Trip Point under
User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S1 FAIL
Source 1 Failure.
Source 1 has failed due to under voltage (UV), over voltage (OV), or running over or under frequency (OF/UF). This alarm
is a companion to S1 UV, S1 UV (RMS), S1 OV and S1 OF/UF.
The load of the Liebert STS2 has been transferred to Source 2.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event has been written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S2 UV
Source 2 Under Voltage (fast detection).
The input voltage from Source 2 dropped below a set percentage of the nominal voltage, as set in the Fast UV setpoint
under the User Settings. An S2 Fail alarm was also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 1.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
S2 UV (RMS)
Source 2 Under Voltage (slow detection).
The input voltage from Source 2 remained below a set percentage of the nominal voltage for a designated period, as set in
the Slow UV Setting and Slow UV Detection Delay set points configured under the User Settings. An S2 Fail alarm was
also issued and source transfer has been inhibited.
The load of the Liebert STS2 has been transferred to Source 1.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The alarm is latched and must be reset after the voltage returns to the nominal voltage. If the Reset option is not configured
for AUTO (automatic reset), then the reset action must be done manually. When the voltage is within acceptable
parameters, touch the RESET button on the touch screen. If you are accessing the unit from a terminal, type CA and press
RETURN on your keyboard.
This event was written to the Event Log, if so configured.
S2 OV
Source 2 Over Voltage.
The input voltage from Source 2 exceeded a set percentage of the nominal voltage, as set in the OV Setting and OV
Detection Delay set points configured under the User Settings. An S2 Fail alarm was also issued and source transfer has
been inhibited.
The load of the Liebert STS2 has been transferred to Source 1.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S2 UF/OF
Source 2 Under Frequency/Over Frequency.
The frequency for Source 2 is running outside the acceptable operating range, as set in the Frequency Trip Point under
User Settings. An S2 Fail alarm was also issued and source transfer has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
S2 FAIL
Source 2 Failure.
Source 2 has failed due to under voltage (UV), over voltage (OV), or running with an over or under frequency (OF/UF). This
alarm is a companion to S2 UV, S2 UV (RMS), S2 OV and S2 OF/UF.
The load of the Liebert STS2 has been transferred to Source 1.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S1 OVERCURRENT
Source 1 Overcurrent.
Liebert STS2 is running on Source 1 and an overload condition has occurred on one or more phases.
Note: The overload setpoint is a single fixed number--101%. An overload condition is detected when the measured load
current is equal to or greater than the setpoint.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S2 OVERCURRENT
Source 1 Overcurrent.
Liebert STS2 is running on Source 2 and an overload condition has occurred on one or more phases.
Note: The overload setpoint is a single fixed number--101%. An overload condition is detected when the measured load
current is equal to or greater than the setpoint.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
S1 I-PEAK
Current Peak on Source 1.
The peak current from Source 1 has exceeded the set point as defined in the I-PK Xfer Lockout setting under User
Settings.
Transferring to Source 2 has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
If this alarm is configured to automatically reset under the set points for User Settings, the alarm clears itself when the I-
Peak condition clears.
If this alarm is set for manual reset mode, the alarm continues to show as active after the current returns to nominal, still
inhibiting transfers. You will need to manually reset the alarm. If configured to be a latching alarm, press RESET on the
display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard.
The alarm has triggered a message to be sent to the modem, if so configured.
S2 I-PEAK
Current Peak on Source 2.
The peak current from Source 2 has exceeded the set point as defined in the I-PK Xfer Lockout setting under User
Settings.
Transferring to Source 1 has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
If this alarm is configured to automatically reset under the set points for User Settings, the alarm clears itself when the I-
Peak condition clears.
If this alarm is set for manual reset mode, the alarm continues to show as active after the current returns to nominal, still
inhibiting transfers. You will need to manually reset the alarm. If configured to be a latching alarm, press RESET on the
display. If you are accessing the unit from a terminal, type CA and press RETURN on your keyboard.
The alarm has triggered a message to be sent to the modem, if so configured.
SOURCES OUT OF SYNC
Sources out of synchronization.
The phase difference between Source 1 and Source 2 has exceeded the deviation as set for MANUAL MAX XFER PHASE
ANGLE under User Settings.
A manual transfer cannot take place while the sources are not synchronized.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
LOAD ON ALT SOURCE
Liebert STS2 load on the alternate source.
The static transfer switch is running on the alternate power source. Check the Event Log to determine the reason for the
transfer from the preferred source.
Another event has caused the system to transfer to the alternate source. The system returns the load to the preferred
source either automatically or manually, depending on how the system is configured.
In automatic reset mode, the Liebert STS2 automatically retransfers to the preferred source after the causal condition
clears.
In manual reset mode, the system remains on the alternate source after the causal event clears until you select RESET
from the touchscreen, or enter CA (Clear Alarms) from a service terminal.
Pressing the RESET button to returns the unit to the preferred source. Ensure that the condition that triggered the
switch has been rectified before returning to the preferred source.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
AUTO REXFER INHIBIT
Automatic Retransfer Inhibited.
The system made five transfers from the preferred source to the alternate source in the last five minutes. As a result,
automatic retransfers back to the preferred source is now disabled.
To clear this alarm condition, assign the alternate source as the preferred source.
This alarm also is cleared if the unit transfers to the preferred source due to an alternate source AC volt failure (i.e., an
emergency transfer).
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
CB1 (S1) OPEN
Circuit Breaker 1 (for Source 1) Open.
Circuit Breaker 1 is not closed.
Check that the Circuit Breaker 1 switch is in the desired position.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
CB2 (S2) OPEN
Circuit Breaker 2 (for Source 2) Open.
Circuit Breaker 2 is not closed.
Check that the Circuit Breaker 2 switch is in the desired position.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
CB4 (S1 BYP) CLOSED
Circuit Breaker 4 (Source 1 Bypass Breaker) Closed.
Circuit breaker 4 is not open. The input from Source 1 is bypassing the static transfer switch.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
CB5 (S1 BYP) CLOSED
Circuit Breaker 5 (Source 2 Bypass Breaker) Closed.
Circuit breaker 5 is not open. The input from Source 2 is bypassing the static transfer switch.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
CB3 (OUTPUT) OPEN
Circuit Breaker 3 (Output breaker) Open.
Circuit breaker 3 is not closed. This circuit breaker is assigned to the output load. The power flow to the load cannot flow
through the static transfer switch.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
CB3A (OUTPUT) OPEN
Circuit Breaker 3A (Output breaker) is Open (Optional).
Circuit breaker 3A is not closed. This circuit breaker is assigned to the output load. The power flow to the load cannot flow
through the static transfer switch.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S1 PHASE ROT ERROR
Source 1 Phase Rotation Error.
A phase rotation error condition exists on Source 1. Check the phase sequence (ABC) of Source 1.
Transferring to Source 1 has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
S2 PHASE ROT ERROR
Source 2 Phase Rotation Error.
A phase rotation error condition exists on Source 2. Check the phase sequence (ABC) of Source 2.
Transferring to Source 1 has been inhibited.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
TRANSFER INHIBITED
Transfer Inhibited.
Uninterrupted transfer between sources is inhibited due to input source failure, sources out of sync, switch failure, or the
unit is in bypass mode.
Check the Event Log for the event or events that may have caused the alarm.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
OUTPUT UV
Output Undervoltage.
The voltage being supplied to the load has dropped below the acceptable nominal voltage. Check the input voltage from
both sources.
This event and the system status surrounding it have been written to a History Log if the History Logs were not already full.
This event was also written to the Event Log, if so configured.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INPUT CONTACT #1
Input Contact Isolator #1.
Occurrence of the indicated external event has been detected by Input Contact Isolator #1 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
INPUT CONTACT #2
Input Contact Isolator #2.
Occurrence of the indicated external event has been detected by Input Contact Isolator #2 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INPUT CONTACT #3
Input Contact Isolator #3.
Occurrence of the indicated external event has been detected by Input Contact Isolator #3 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INPUT CONTACT #4
Input Contact Isolator #4.
Occurrence of the indicated external event has been detected by Input Contact Isolator #4 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INPUT CONTACT #5
Input Contact Isolator #5.
Occurrence of the indicated external event has been detected by Input Contact Isolator #5 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
INPUT CONTACT #6
Input Contact Isolator #6.
Occurrence of the indicated external event has been detected by Input Contact Isolator #6 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INPUT CONTACT #7
Input Contact Isolator #7.
Occurrence of the indicated external event has been detected by Input Contact Isolator #7 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
INPUT CONTACT #8
Input Contact Isolator #8.
Occurrence of the indicated external event has been detected by Input Contact Isolator #8 of the Open Comms Digital Input
option board.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event, with its assigned name, was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
CONFIG MODIFIED
Configuration Modified.
A set point has been updated and saved.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
PASSWORD CHANGED
Access Password Changed.
The password for accessing the HMI (touch screen) options has been updated and saved.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The alarm has triggered a message to be sent to the modem, if so configured.
The event was written to the Event Log, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
TIME REPROGRAMMED
System Time Reprogrammed.
The system’s time setting has been updated and saved.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
DATE REPROGRAMMED
System Date Reprogrammed.
The system’s date setting has been updated and saved.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Event Message Help Text
EVENT LOG CLEARED
Event Log Cleared.
All past alarms and faults are no longer recorded in the system’s event log.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
This event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
HIST LOGS CLEARED
History Logs Cleared.
Both History Logs have been erased and the logs are now available to record future events.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
HIST LOGS FULL
History Logs Full.
The history buffer has reached its capacity for both history logs. No further history logs can be written until the logs are
cleared. The History Logs were frozen by the occurrence of two designated faults or alarms.
Both history logs have been frozen by significant events. These logs contain valuable diagnostic data regarding those
events which may be useful if service is required. Once the logs have been analyzed and the causes for freezing them
have been resolved, the history logs should be cleared to make them available for capturing future events.
To clear the History Logs, select the CLEAR HLOG button under the LOGS > HISTORY LOG 1 or LOGS > HISTORY LOG
2 menus to clear the History Status buffer after the alarms have been resolved.
If you are accessing the unit from a terminal, type CHL and press RETURN to clear the History Logs.
Press SILENCE on the touch screen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2
system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
The event was written to the Event Log, if so configured.
The alarm has triggered a message to be sent to the modem, if so configured.
If configured to be a latching alarm, press RESET on the display. If you are accessing the unit from a terminal, type CA and
press RETURN on your keyboard.
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Maintenance
17.0 MAINTENANCE
WARNING
!
Only qualified service personnel should perform maintenance on the static switch.
Lethal voltages exist inside the unit during normal operation.
The unit is supplied by multiple AC power sources. Disconnect and lock-out all power sources
before working inside unit.
Minimal periodic maintenance of the Liebert STS2 is required. As with all electrical distribution
components, the system should be regularly inspected for electrical connection integrity, signs of
excessive temperatures, dirt accumulation, and proper system operation.
17.1 Proper Tightening of Nuts and Bolts
The recommended tightening torque for all nuts and bolts is as shown below, unless otherwise
labeled. All power connections are designed to remain at proper torque throughout the lifetime of the
unit.
Table 24 Torque tightening
Grade 5 -Imperial
Grade 8.8 -Metric
Electrical Connections
With Belleville Washers
Bolt Shaft
Size
in-lb
N-m
3
in-lb
35
N-m
4
10-32
1/4-20
5/16-18
3/8-16
1/2-13
25
53
6
80
9.0
107
192
428
12
22
48
180
240
480
20.4
27.1
54.3
17.2 Testing the Liebert STS2
The Liebert STS2 includes comprehensive system alarms and fault detection to identify operational
problems. To increase the degree of confidence of proper system operation, periodic transfer tests can
be easily performed. For instructions for changing the preferred source and switching sources:
17.3 Changing the Air Filter
A standard furnace filter is installed behind the air intake in the front door. The air intake allows air
to circulate to cool the unit. Replace the filter when it becomes dirty and impedes air flow. The
frequency of changing or cleaning the filter depends on the location in which the unit is located.
The size of the filter is 1 in. x 25 in. x 25 in. (2.54 cm x 63.5 cm x 63.5 cm).
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Maintenance
SUPPORT INFORMATION
To contact Emerson Network Power Liebert Services for information or repair service in the United
States, call 1-800-LIEBERT (1-800-543-2378). Liebert Services is available to assure fast repair of
your unit with minimal downtime. Liebert Services offers a complete range of startup services, repair
services, preventive maintenance plans, and service contracts.
For repair or maintenance service outside the 48 contiguous states, contact Liebert Services, if
available in your area. For areas not covered by Liebert Services, the authorized distributor is
responsible for providing qualified factory-authorized service. Additional telephone numbers and
E-mail contact information is on the back page of this manual.
Please have the following information available.
Part Number:
Serial Number:
Date Purchased:
Date Installed:
Location:
Current Rating:
Frequency:
Voltage:
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Maintenance
PROGRAMMABLE RELAY BOARD SETTINGS RECORD
The optional Programmable Relay Board (PRB) has eight channels to report events to an external
device. Up to ten (10) events can be programmed to each channel. See 6.1 - Programmable Relay
Board for more information on the PRB.
If your Liebert STS2 has the PRB option installed, list the settings below for future reference. If
control power is lost in the Liebert STS2, the settings are not saved.
Channel 1:
Channel 2:
Channel 3:
Channel 4:
Channel 5:
Channel 6:
Channel 7:
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Maintenance
Channel 8:
Channel 9:
Channel 10:
PRB Notes:
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Maintenance
INPUT CONTACT ISOLATOR SETTINGS RECORD
The Input Contact Isolator board (ICI) provides an Liebert STS2 module interface for up to eight
external user alarm or message inputs to be routed through the Liebert STS2’s alarm network. See
6.4 - Input Contact Isolator Board for more information on the ICI.
If your Liebert STS2 has the ICI option installed, list the settings below for future reference. If control
power is lost in the Liebert STS2, the settings are not saved.
Channel 1:
Channel 2:
Channel 3:
Channel 4:
Channel 5:
Channel 6:
Channel 7:
Channel 8:
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Ensuring The High Availability
Of Mission-Critical Data And Applications.
Emerson Network Power, a business of Emerson (NYSE:EMR),
is the global leader in enabling Business-Critical Continuity™
from grid to chip for telecommunication networks, data centers,
health care and industrial facilities. Emerson Network Power
provides innovative solutions and expertise in areas including
AC and DC power and precision cooling systems, embedded
computing and power, integrated racks and enclosures,
power switching and controls, infrastructure management,
and connectivity. All solutions are supported globally by local
Emerson Network Power service technicians. Liebert AC power,
precision cooling and monitoring products and services
from Emerson Network Power deliver Efficiency Without
Compromise™ by helping customers optimize their data center
infrastructure to reduce costs and deliver high availability.
Technical Support / Service
Web Site
www.liebert.com
Monitoring
liebert.monitoring@emerson.com
800-222-5877
Outside North America: +00800 1155 4499
Single-Phase UPS & Server Cabinets
liebert.upstech@emerson.com
800-222-5877
Outside North America: +00800 1155 4499
Three-Phase UPS & Power Systems
800-543-2378
Outside North America: 614-841-6598
Environmental Systems
800-543-2778
Outside the United States: 614-888-0246
Locations
United States
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Europe
Via Leonardo Da Vinci 8
Zona Industriale Tognana
35028 Piove Di Sacco (PD) Italy
+39 049 9719 111
Fax: +39 049 5841 257
While every precaution has been taken to ensure the accuracy
and completeness of this literature, Liebert Corporation assumes no
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
© 2008 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
Asia
29/F, The Orient Square Building
F. Ortigas Jr. Road, Ortigas Center
Pasig City 1605
Philippines
+63 2 687 6615
® Liebert is a registered trademark of Liebert Corporation.
All names referred to are trademarks
Fax: +63 2 730 9572
or registered trademarks of their respective owners.
SL-20620_REV8_05-11
Emerson Network Power.
The global leader in enabling Business-Critical Continuity™
EmersonNetworkPower.com
AC Power
Connectivity
DC Power
Embedded Computing
Outside Plant
Racks & Integrated Cabinets
Embedded Power
Power Switching & Controls
Precision Cooling
Services
Infrastructure Management & Monitoring
Surge Protection
Emerson, Business-Critical Continuity, Emerson Network Power and the Emerson Network Power logo are trademarks of Emerson Electric Co. or one of its affiliated companies.
©2010 Emerson Electric Co.
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