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 TM 55-1905-223-24-3
(d) Shut down the generator and connect the push-on leads to terminals P2, P3, and P4 on the
voltage regulator. Remove tags.
NOTE
When the generator is being controlled by the voltage regulator,
a fault in the permanent magnet exciter could result in voltage
drift or a loss of voltage completely.
b. Electronic Control System.
NOTE
Should all windings tests prove successful, faults can normally
be assumed to be within the voltage control system and/or its
respective wiring.
(1) Check for broken, loose, or corroded connections on the voltage regulator. Correct as required.
(2) Check the wiring between auxiliary terminals and the voltage regulator for breaks, burns, loose
terminals, or other damage. Correct as required.
(3) To check for a defective automatic voltage regulator, perform the following procedure.
(a) Operate engine at rated speed.
(b) Turn voltage adjust rheostat on the automatic voltage regulator from maximum to minimum
volts.
(c) If the generator output voltage changes, the automatic voltage regulator is operating properly.
REPAIR
Repair of the generator assembly is limited to replacement of defective semiconductors.
a. Removal of semiconductors.
WARNING
Before attempting any work on the generator, ensure engine is
shut down and automatic starting circuits are disabled to avoid
injury to personnel. Read the WARNING section at the front of
this manual before performing any maintenance function.
(1) Turn off and tag all starting circuits to the generator set.
3-23
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