OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2
Chapter 2-4
Page 17
Protective Circuit (continued)
Trouble, Symptom,
Condition
Probable Cause
Test, Check, and/or Remedy
3.
Load contactor opens
during power delivery.
Over frequency fault
indicated.
a.
Frequency adjust
switch is enabled.
Set frequency adjust switch on the ESB board to
DISABLE
b.
Defective REG board
If over-frequency faults continue after engine’s
ECM is proven to be good, and an over-frequency
condition does not exist, replace the REG board.
4.
Load contactor opens
during power delivery.
Under frequency fault
indicated.
a.
Frequency adjust
switch is enabled
Set frequency adjust switch to DISABLE
b.
Defective REG board
If under-frequency faults continue after engine’s
ECM is proven to be good, and an under-frequency
condition does not exist, replace REG board.
5.
Load contactor opens
during power delivery.
Overload fault
indicated.
a.
There may have been
an overload condition.
Observe the ammeter. Check for abnormal
overload conditions and correct. If the load
contactor opens when an overload does not exist,
proceed to step b.
b.
Defective CTL board
Replace CTL board.
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