Generator Excitation Circuits - Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set

Generator Excitation Circuits

Trouble, Symptom,
Condition
1. No (or low)
generator output
voltage in all
phases. Generator
operating at 400 Hz.
May 2, 2013
Revision 2
Probable Cause
a. Defective generator or
excitation circuit
b. Open fuse on Voltage
Regulator (REG) board
c. Defective Voltage
Regulator (REG)
d. Defective connector at
voltage regulator, or
defective wiring from
regulator to exciter field
Test, Check, and/or Remedy
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.
Check the fuses on the Voltage Regulator board.
Verify by swapping with a known good Voltage
Regulator (REG) Board and replace if required.
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.
Chapter 2-4
Page 13