OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013
Chapter 2-4
Page 23
Faults
Fault
code
Name
Possible Cause(s)
Corrective Action
_ _.23
REG OUTPUT UNDER FREQ
FAULT
Defective engine ECM
Defective REG board
Replace engine ECM.
Replace REG board.
_ _.24
REG CONTACTOR1 FAULT
Defective output contactor
Defective REG board
Replace output contactor.
Replace REG board.
_ _.25
REG CONTACTOR 2 FAULT
Defective output contactor
Defective REG board
Replace output contactor.
Replace REG board.
_ _.26
CTL DC OVER VOLTAGE
FAULT
Defective CTL board
Replace CTL board.
_ _.27
CTL DC UNDER VOLTAGE
FAULT
Defective CTL board
Replace CTL board.
_ _.28
TRB OUTPUT OVER
VOLTAGE FAULT
Voltage set too high
TRB board defective
Reset and restart GPU.
Replace TRB board.
_ _.29
TRB OUTPUT UNDER
VOLTAGE FAULT
Voltage set too low.
TRB board defective
Reset and restart GPU.
Replace TRB board.
_ _.30
TRB OUTPUT OVERLOAD
FAULT
DC load over rating of GPU
Reset and restart GPU.
_ _.31
TRB DC CONTACTOR
FAULT
Defective output contactor
Defective TRB board
Replace output contactor.
Replace TRB board.
_ _.32
REG EF1 VOLTAGE TOO
HIGH FAULT
EF voltage being sent from
aircraft on output 1 to the GPU
is too high.
Output cable is defective.
Reset and restart GPU.
Check output cable.
_ _.33
REG EF2 VOLTAGE TOO
HIGH FAULT
EF voltage being sent from
aircraft on output 2 to the GPU
is too high.
Output cable is defective.
Reset and restart GPU.
Check output cable.
_ _.34
TRB AC CONTACTOR
FAULT
Defective input contactor.
Defective TRB board
Replace input contactor.
Replace TRB board.
_ _.40
CTL ID FAULT
Defective CTL board
Replace CTL board.
_ _.41
TRB ID FAULT
Defective TRB board
Defective or missing ID
resistor
Replace TRB board.
Replace or install ID resistor.
_ _.42
ESB ID FAULT
Defective ESB board
Replace ESB board.
_ _.43
REG ID FAULT
Defective REG board
Replace REG board.
_ _.44
TRB HEATSINK OVERTEMP
FAULT
Obstructed cooling air path
Defective thermal switch
Clear air obstruction.
Replace switch.
_ _.45
TRB TRANSFORMER
Obstructed cooling air path
Clear air obstruction.
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