OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Chapter 2-3
Page 18
g
The contactor should open in 10 seconds. The fault code meter will read “
70.30
”
h
Discontinue power delivery and let the cables cool for 2-3 minutes.
(7) Temperature Overload Protection
a
Press “
DC OUTPUT
” push button to close the DC output contactor. The blue “
DC OUTPUT
”
lamp will glow indicating that DC power is being delivered to the load bank.
b
Remove one wire from the thermostat switch located on the right side of the T-R heat sink.
This will open the switch, thus simulating an over temperature fault. The fault code meter will
read “
70.44
”
(8) Silicon Diodes
a
Shut the GPU completely down removing all power from the system.
b
Disconnect diode leads.
c
Use a good quality ohmmeter, place one ohmmeter lead on the threaded end of the diode
and the other lead on the diode lead and the record value.
d
Reverse the ohmmeter leads and record the value.
e
The diode may generally be considered good if one reading is infinite or very high and the
other reading is extremely low.
(9) Control Interlock Kit (Optional)
a
With the output cable sitting in the cable tray, start the GPU and bring the engine to rated
speed.
b
Close the output contactor by pressing the “
DC OUTPUT
” push button. The output contactor
should open immediately with an “
EF3
” warning displayed on the fault code meter.
c
Using a 28 VDC power source, apply a 28 VDC signal to the control socket of the output
cable (small socket).
d
Close the output contactor by pressing the “
DC OUTPUT
” push button. The output contactor
should stay closed.
e
Remove the 28 VDC power source and the contactor should open with an “
EF3
” warning.
7) Adjusting the Transformer-Rectifier (for units with DC option)
The T-R is design to be adjustment free. No adjustments required, other than periodically checking the
output voltage and adjusting the TRB PC board potentiometer as necessary.
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