TP-6881 7/1594 Section 5 Component Testing and Adjustment
Underspeed and Underfrequency Shutdowns
Close the throttle while the generator is running. The
engine speed should decrease until the generator set
shuts down and the controller indicates an Engine
Speed Low Shutdown.
To check the underfrequency s hutdown, use very small
movements over a longer period of time to close the
throttle. The genset may need to run at reduced
frequency for about a minute before the Frequency Low
Shutdown is triggered.
Locked Rotor Shutdown
Remove the connector from the starter relay (see
Figure 5-34). Press RUN. Verify that the engine does
not turn and the controller indicates a Locked Rotor
fault.
Oil Temperature High Shutdown
Note: Testing the high engine temperature shutdown
requires connecting a jumper wire across the
temperature sensor connections. Because the
temperature sensor can be difficult to reach, the
jumper can be placed across pins 9 and 10 on
connector P1 at the generator set controller, if
desired.
Disconnect the harness (connector P7) at the oil
temperature sensor (OTS). See Figure 5-22 for the
temperature sensor location, or see the note above.
Connect a jumper wire across the temperature sensor
connections in connector P7 or connections P1-9 and
P1-10 on the controller. See Figure 5-21. Press RUN to
start the generator set. After 5 seconds, verify that the
controller displays a high oil temperature fault. If the oil
temperature remains high (jumper connected) without
increasing, the generator set will run for 5 minutes in
engine cooldown mode.
Press the OFF button on the controller and remove the
jumper wire. Start the generator set and verify that the
generator set does not enter the engine cooldown cycle
or shut down on a high temperature fault. Reconnect P7
to the temperature sensor.
GM89012
Figure 5-21 Temperature Sensor Connector P7
8RESV
1
1. Temperature sensor location
10/12RESV
1
Figure 5-22 Temperature Sensor (OTS) Location
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