TM 9-4940-568-34
5-127
This task covers:
a. General Information
b. Testing Exciter Stator
c. Testing Exciter Rectifier Bridge (Rotating Rectifier Assembly)
d. Testing Exciter Rotor
e. Testing Main Rotor (Generator Field)
f. Testing Main Stator
g. Testing PMG Exciter
INITIAL SETUP
Equipment Condition
FRS unloaded, (TM 9-4940-568-10)
Batteries disconnected, (TM 9-4940-568-10)
Tools and Special Tools
Multimeter (Item 12, Appendix F)
Socket Set, 3/8 in. (Item 52, Appendix F)
Wheatstone Bridge (Item 73, Appendix F)
Wrench, Torque 3/8 in. Drive (0 to 60 N.m)
(Item 85, Appendix F)
5-22. GENERATOR TESTING.
Materials/Parts
Heat-Shrink Compound (Item 48, Appendix B)
a.
General Information.
These tests can be performed without removing the generator.
Accidental starting of the generator set while working on it can cause severe personal injury or
death. Prevent accidental starting by disconnecting the starting battery cables (negative [–] first).
Arcing can ignite the explosive hydrogen gas given off by batteries, causing severe personal injury.
Arcing can occur if the negative (–) battery cable is connected and a tool being used to connect or
disconnect the positive (+) battery cable accidentally touches the frame or other grounded metal
part of the set. To prevent arcing, always remove the negative (–) cable first, and reconnect it last.
Always disconnect a battery charger from its AC source before disconnecting the
battery cables. Otherwise, disconnecting the cables can result in voltage spikes high
enough to damage the DC control circuits of the set.
