Series 1501 Selectronic®
Micro-Controller/Annunciator
S15-96122B
Revised 07-06
Catalog Section 50
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Alarm/Shutdown for 32 or 64 N.O. or N.C. Sensors
Operating Sequence Selection
Field Adjustable Sensor Nomenclature
Selectable Sensor Lockouts Class A, B, C or P
Built-In Tachometer/Overspeed Function
RS232 or RS485 Modbus RTU Communications
Two Start/Run Timers and Elapsed Time Meter
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CSA Certified or NRTL Approved for Use in
Class I, Div. 1 Grps. C & D Hazardous Locations
NRTL/C
Applications
Adjustable Time Delays:
Description
(standard Series 1501)
The Series 1501 system can be configured to mon-
itor applications such as: Air and Gas
Compressors, Natural Gas Refueling, and other
Industrial Operations. For a list of applications and
our cataloged programs contact a Murphy sales
representative. Custom programming available at
additional charge.
The Series 1501 instrument is a microprocessor-
based alarm, shutdown and control system with
tachometer/hourmeter function. It annunciates
in alphanumeric characters the protective device
that has signaled an alarm or caused equipment
shutdown. Information is called up and adjust-
ments are made on a six-button keypad on the
face of the unit. Configurations such as: Alarm
or Shutdown Nomenclature, Preset Timers, and
Tachometer Calibration can be made in the
field.
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Prelube
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Rest
Process Delay
Run Delay
Purge
Permissive
Idle/Cooldown
Postlube
Crank
Fuel Delay
Load Delay
Test
Class B1 Sensor Lockout
Class B2 Sensor Lockout
Features
Before Ignition Ground or Electric Motor
Stop (for up to 59 seconds)
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32 or 64 sensor inputs (N.O. or N.C.) for
alarm or shutdown.
Sensor Inputs Terminal Block: Rail mount
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Easy operation/adjustments Six-button keypad.
DIN type; 32 terminals, screw type.
Murphy’s Series 1501 system has seven SPDT
relays. On the standard model, the relays are
assigned to the following functions: Lube,
Crank, Ignition/Motor, Fuel Valve, Load,
Alarm, Shutdown.
The complete Series 1501 system consists of a
head (monitor), sensor input terminal strip (two
needed for 64 sensor models), 36 inch (914
mm) flat ribbon cable(s) for connecting the ter-
minal block to the head/monitor, and a Class I,
Div. 1, explosion-proof power supply.
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RS232 or RS485 Modbus RTU communica-
Opto-Isolated Tach/Run Input: Magnetic
pickup, 4.5 to 120 Vrms, 0-10 kHz. CD igni-
tion, positive or negative ground, 100 to 300
VDC, 3-666 Hz. 12 to 125 VDC or 120 Vrms,
50/60 Hz may be used for run signals.
tions.
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Automatic Engine Control.
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Two Start-Run Timers.
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Seven Control Relay Outputs.
Operating Temperatures: 32 to 122°F
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Pre/Postlube Time Delay.
(0 to 50°C).
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Automatic Compressor Loading.
Storage Temperatures: -4 to 158°F (-20 to 70°C).
Case: ABS plastic, 1/4 DIN (90 x 90 mm).
Specifications
Interface Output: Factory configured for
RS232; field-selectable for RS485 (specify
for factory configured RS485).
Power Consumption: 120 VAC (7.5 VA);
12 VDC (3.5 watts); 24 VDC (3.5 watts).
Sensor Inputs: 32 to 64 N.O. and/or N.C. inputs
Alphanumeric Display: 2 lines, each line with
®
The Series 1501 system is powered from 120
such as Murphy Swichgage instruments.
16 characters (32 characters total).
Field selectable as a Class A, B1, B2 , C , P or
ESD for shutdown, alarm, or control function.
VAC
or
Power Supply Enclosure: Explosion-proof,
Class I, Division 1. Intrinsically safe barrier
built into the power supply, 120 VAC with 7
form “C” relay outputs for the following
functions (with standard S1501):
12 or 24 VDC. The head/monitor is rated intrin-
sically safe and includes a communication port:
RS232 or RS485 (Modbus RTU slave). This
port allows for remote control functions such as
Start/Stop, Load/Unload, etc., and for access to
Series 1501 registers.
Outputs: 7-SPDT relay outputs, 5 A, 1/16 HP,
125/250 VAC/ 1 A, 30 VDC.
NOTE: For hazardous areas an approved isola-
tion barrier must be used between sensor switch
and input terminals if the sensor output comes
from any energy storing device such as a relay or
transistor.
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Lube
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Load
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Crank
Shutdown
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Alarm
Fuel Valve
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Ignition/Motor
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S15-96122B page 1 of 2
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