GPM-9013B
Revised 11-96
Catalog Section 40
(00-02-0104)
Glow Plug Control Module
Model GPM92
■
Automates Manual Glow Plug Preheat and
Recycling Control in Diesel Engines
■
Compatible with Most Murphy Automatic
Start/Stop Controllers
■
Two Field-Adjustable Time Delays:
●
Timer for Preheating Glow Plugs
Before Initiating Start Sequence
●
Recycle Timer-When Engine Fails to
Start on First Attempt
■
Preheat Bypass Circuit for Warm Weather
■
LED’s to Assist with Sequence of Operations
Description
The GPM92 is a solid-state delay module for
automating the glow plug preheating and
recycling process in diesel engines with
automatic start controls.
The start signal is connected to the GPM92
allowing the glow plugs to be preheated
before the starter is engaged.
The GPM92 is designed to operate from
either a maintained close to run, open to stop
signal or a momentary close to run, momen-
tary close to stop type circuit. The auto start
controller must be configured to operate
from a maintained close to run signal.
The module includes two adjustable time
delays, one for glow plug preheating time and
the other to allow the auto start module to
crank the engine and start it.
If the engine fails to start before the recycle
time delay expires, the GPM92 recycles for the
full time set on the glow plug delay timer. It
then signals the auto start controller to initiate a
new cranking cycle until the engine starts.
One bypass circuit overrides glow plug preheat
time with a glow plug ready signal and con-
trols the length of the glow plug heating cycle.
A second bypass circuit is provided to turn
off the glow plugs when the engine starts.
The preheat is locked out, and the start signal
is locked into the auto start controller until a
stop signal is received. This circuit can also
be used with an external summer/winter
switch to bypass the preheat system during
warm weather when preheating is not
required.
The GPM92 requires an external relay to
handle the high current to the glow plugs.
Application
The GPM92 is intended for use on all diesel
engines that require glow plug or flame type
preheat and are equipped with automatic
start-stop controls. The GPM92 is ideal for
Murphy Automatic Start Controllers which do
not include glow plug control provisions or
other cold weather starting aids.
Features
■
Solid-State Control Module
■
Easy DIP Switch Programming
■
5 LED Signal Indicators for:
●
Start (GPM92 receives start signal.)
●
Recycle Bypass (Recycle bypass
input received/engine running.)
●
Glow Plug Bypass (Bypass input
circuit has closed.)
●
Glow Plug Output (Relay energized
for heating glow plug.)
●
Start Output (Preheat cycle completed.)
■
Quick Connect Terminal Blocks
■
Compact Design
Specifications
Power Requirements:
Voltage: 8-30 VDC.
Current: 30 mA maximum @ 30 VDC.
Input Polarity: negative ground.
Signal Inputs:
Start: Single pole, single throw (SPST)
maintained, close to negative to run, open
to stop or 2 SPST momentary, close to neg-
ative to start and close to negative to stop.
Glow Plug Time Delay Bypass: SPST
maintained, close to positive to bypass.
Recycle Time Delay Bypass: SPST main-
tained, close to negative to bypass or SPST
maintained, close to positive to bypass.
Output:
Glow Plug Relay: Transistor, sinks to
negative, 1 A @ 30 VDC.
Start: Dry relay contact, 2 A @ 30 VDC.
NOTE: A customer-supplied relay for glow
plugs is required.
Glow Plug Timer: Adjustable from 1-127 sec-
onds; 7-element binary DIP switch.
Recycle Timer: Adjustable from 1-127 sec-
onds; 7-element binary DIP switch.
Temperature Range: -4 to 185°F
(-20 to 85°C).
Case: ABS Plastic Housing
Shipping Weight: 0.488 lb. (0.221 kg).
Shipping Dimensions: 4-
3
/
4
x 4-
3
/
4
x 3-
1
/
8
in.
(121 x 121 x 79 mm).
