Hobart 500062-DLX, Operation And Maintenance Manual With Illustrated Parts List

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OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2 Chapter 2-4
Page 20
T-R Controls and Components (continued)
Trouble, Symptom, Condition Probable Cause Test, Check, and/or Remedy
2. (continued) e. Interlock signal not being
received from the aircraft Be sure the output cable is properly
inserted into the aircraft receptacle and
try again.
Verify 28 VDC is on the DC+ connection
of the GPU and/or being sent from the
aircraft.
If aircraft is sending signal but not being
received at the GPU DC+ and the cable
is properly inserted into the aircraft
receptacle, verify the K403 relay is
operating.
If K403 relay is operating, replace output
cable.
If all the above appears to be working,
replace the TRB board.
3. STARTING CURRENT push
button sets the current limit,
but the system is not current
limiting.
a. Defective push button switch At rated speed, measure the voltage
across the switch. The voltage should
read approximately 5 VDC. Press the
switch again and the voltage should go
to 0 V. If voltage does not go to 0 V, the
switch is defective and needs to be
replaced.
b. Defective TRB Board Replace TRB board with a board known
to be operating properly. If current
limiting is still not operating, contact the
factory.
4. STARTING CURRENT push
button does not increment
the current limiting values.
a. Defective push button switch At rated speed, measure the voltage
across the switch. The voltage should
read approximately 5 VDC. Press the
switch again and the voltage should go
to 0 V. If voltage does not go to 0 V, the
switch is defective and needs to be
replaced.
b. Defective TRB Board Replace TRB board with a board known
to be operating properly. If contactor
still doesn’t close, contact the factory.