OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2
Chapter 2-4
Page 19
T-R Controls and Components
Trouble, Symptom,
Condition
Probable Cause
Test, Check, and/or Remedy
1.
Input AC and Output DC
contactor will not close
when
DC OUTPUT
push
button S431 is pressed.
Engine running normally,
AC voltage normal, no
load applied to output
cable.
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.
Fault code display indicates
defective contactor:
•
70.46
for input contactor
•
70.31
for output contactor
Check all wire connections or replace with a
known good contactor.
If the above works correctly, see Step c.
c.
Defective TRB Board
Replace TRB board with a board known to be
operating properly. If contactor still doesn’t
close, contact the factory for further
information.
2.
Load contactor K402
opens during power
delivery. The engine is
still running at rated
speed or has returned to
idle.
a. Defective
load contactor.
Fault Codes Display
•
70.46
for input contactor
•
70.31
for output contactor
Check all wire connections or replace with a
known good contactor.
If the above works correctly, see Step c.
b.
Contactor opening could have
been normal because of an
over/under-voltage condition.
Fault Codes Display
•
70.28
for over-voltage
•
70.29
for under-voltage
Resume operation and closely observe
voltmeter and fault code gauge for evidence
of over/under-voltage condition. If contactor
opens and no over/under-voltage condition
exists, proceed to Step c.
c.
Contactor opening could have
been normal because of an
overload or over temperature
condition.
Fault Codes Display
•
70.30
for overload
•
70.44 or 70.45
for over
temperature
Resume operation and closely observe fault
code gauge for evidence of and overload or
over temperature condition. If contactor
opens and neither condition applies, proceed
to Step d.
d.
Defective TRB Board
Replace TRB board with a board known to be
operating properly. Resume power delivery.
If contactor still opens, contact the factory for
further information.
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