Hobart 120CU20, Operation And Maintenance Manual With Illustrated Parts List

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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.