OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2
Chapter 2-4
Page 13
Generator Excitation Circuits
Trouble, Symptom,
Condition
Probable Cause
Test, Check, and/or Remedy
1.
No (or low)
generator output
voltage in all
phases. Generator
operating at 400 Hz.
a.
Defective generator or
excitation circuit
On Voltage Regulator (REG) board (A4), place the
Regulated/ Diagnostic
switch in the
Diagnostic
position. This applies 12 VDC from battery to
exciter field, which should produce an indicated
output voltage of 100 +/- 20 VAC line to neutral. If
voltage produced is within this range, the generator
is good, and trouble may be in the voltage regulator
circuit.
b.
Open fuse on Voltage
Regulator (REG) board
Check the fuses on the Voltage Regulator board.
c.
Defective Voltage
Regulator (REG)
Verify by swapping with a known good Voltage
Regulator (REG) Board and replace if required.
d.
Defective connector at
voltage regulator, or
defective wiring from
regulator to exciter field
Disconnect the exciter wires at the terminal strip.
Using jumper leads with clip terminals, connect 12
VDC to wires. If generators produce at least 80
VAC, replace or repair the connector and wiring
between voltage regulator and exciter field as
required.
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