TM 9-6115-729-24
0003
GENERATOR SET CONTROL (GSC) - Continued
A1 RELAY
NAME
LIGHTS WHEN
K1
Electronic Governor Relay (EGR)
On whenever ECM is enabled (engine is running).
(Output is not used) Internal connection shorts across
ENGINE CONTROL switch so that power can not be
removed from GSC while engine is running.
K2
Generator Fault Relay (GFR)
On when a generator fault is detected. Engaged to
disconnect the load.
K3
Crank Termination Relay (CTR)
On when the engine is running on its own (and the
starter should be released). Output is not used.
K4
Starting Motor Relay (SMR)
After ENGINE CONTROL is set to START, K4 is on
while starter is cranking. Goes out after 10 seconds
or after engine is detected as running. If engine does
not start, light goes off for 10 seconds, then comes
back on for 10 seconds trying again to start the
engine.
K5
Run Relay (RR)
On whenever the engine should be running.
K6
Air Shut Off Relay (ASR)
On during fault shutdowns. Not used.
K7
Fuel Control Relay (FCR)
On when engine should be running. Output not used.
Internal connection shorts across ENGINE CONTROL
switch so that power can not be removed from GSC
while engine is running.
K8
Programmable Spare Relay (PSR)
On when alarm condition occurs that would cause the
GSC to disconnect the load.
The column of indicators at the left side of the GSC indicate impending problems or what condition caused a
shutdown. The ECM resides on the engine and controls the operation of the engine, such as starting, stopping,
speed control through fuel control, ignition timing, and monitors various sensors on the engine. Problems
diagnosed by the ECM are sent via the CAT Data Link to the GSC and displayed on the GSC display with an E
suffix to identify them as engine diagnosed. The GSC sends a speed control signal and a governor on/off signal
