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

Page: 120 / 246

OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013 Chapter 2-4
Page 22
Troubleshooting Table
Faults
Fault
code
Name Possible Cause(s) Corrective Action
Air
EIB AIR RESTRICTION
FAULT Air filter is obstructed or dirty.
Bad air restriction indicator
Check for obstructions.
Change air filter cartridge or
air restriction indicator.
FUEL EIB LOW FUEL WARNING
Fuel tank level is below ¼
tank.
Fill fuel tank.
_ _.00 Invalid Fault
_ _.03 CTL MEMORY FAULT CTL board defective Replace the CTL board.
_ _.04 REG EF1 LOSS FAULT
EF1 voltage signal not present
CTL board defective
Switch the EF1 switch to “ON”
Check cable contacts.
Replace the CTL board.
_ _.05 REG EF2 LOSS FAULT
EF2 voltage signal not present
CTL board defective
Switch the EF2 switch to “ON”
Check cable contacts.
Replace the CTL board.
_ _.06 TRB EF3 LOSS FAULT
EF3 voltage signal not present
TRB board defective
K403 relay defective
Defective Output Cable Check cable/aircraft connection.
Place a 28 VDC signal of DC+ at
output cable and at GPU.
Replace defective components.
_ _.16
CTL OUTPUT OVER
VOLTAGE FAULT
Voltage set too high
LDC set too high
CTL board defective Adjust voltage or the LDC on the
REG board.
Replace CTL board.
_ _.17
CTL OUTPUT UNDER
VOLTAGE FAULT Voltage set too low
CTL board defective Adjust voltage on the REG board.
Replace CTL board.
_ _.18
CTL OUTPUT 1 OVERLOAD
FAULT
Overload on Output 1 Reset and restart GPU.
_ _.19
CTL OUTPUT 2 OVERLOAD
FAULT
Overload on Output 2 Reset and restart GPU.
_ _.20
CTL MACHINE OVERLOAD
FAULT
Total overload on Output 1 & 2 Reset and restart GPU.
_ _.21
CTL OUTPUT VOLTAGE
IMBALANCE FAULT Open or broken sense line
Load not balanced
Repair sensing wire.
Check load imbalance and
correct as required.
_ _.22
REG OUTPUT OVER FREQ
FAULT Defective engine ECM
Defective REG board Replace engine ECM.
Replace REG board.