TP-5986 4/0320 Section 6 Controller Troubleshooting
At the same time the K1 relay is energized, the time
delay for the K5 relay starts. After 5--10 seconds, the K5
relay is energized (LED 5 lights).
The normally-open K5 contacts close to permit the
function of the engine safety shutdown switches.
6.1.3 Stop
Close the start/stop switch between N and 43 (local or
remote).
The K4 relay energizes (LED4 lights).
The normally-closed K4 contacts open, disabling the
fuel pump (FP), choke heater (CHTR), antidiesel
solenoid (ADS), and ignition (IGN).
The normally-open K4 contacts close, latching the
circuit to the K4 relay until the generator set comes to a
complete stop.
6.2 Engine Safety Shutdown
Switches
6.2.1 Low Oil Pressure (LOP) Shutdown
When low oil pressure occurs, the LOP shutdown switch
contacts close energizing the K4 relay (LED4 lights).
The generator shuts down, as described in
Section 6.1.3.
Note: During cranking, the low oil pressure shutdown
switch deactivates until the K5 relay energizes.
This delay allows the engine to reach normal
operating oil pressure.
6.2.2 Loss of Coolant Switch (LCS)
Shutdown
When the coolant level is low, the LCS contacts close,
energizing the K4 relay (LED4 lights). The generator
shuts down, as described in Section 6.1.3.
6.2.3 High Engine Temperature Switch
(HET) Shutdown
When the engine temperature exceeds 110 _C (230_F),
the HET contacts close, energizing the K4 relay (LED4
lights). The generator shuts down, as described in
Section 6.1.3.
6.2.4 Controller Circuit Board
The controller circuit board has light emitting diodes
(LEDs) that indicate the presence of relay coil power.
When any of the relays K1--K5 receive power, the
corresponding LED lights.
11
GM10516
Figure 6-2 GM10516 Controller Circuit Board
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