TP-5737 5/0170 Section 7 Component Testing and Adjustment
M
3-100
R12758-8
TP-5353-7
1
1. Megohmmeter connections across F+ and F-- leads and
rotor shaft
Figure 7 -15 High Voltage Test
7.8 Exciter A rmature
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving rotor.
WARNING
High voltage test. Hazardous voltage can cause severe
injury or death. Follow the instructions of the test equipment
manufacturer when performing high-voltage tests on the rotor
or stator. An improper test procedure can damage equipment
or lead to generator set failure.
Hot engine and exhaust system.
Can cause severe injury or death.
Do not work on the generator set until
it cools.
WARNING
Servicing the generator. Hot parts can cause severe
injury or death. Avoid touching the generator set field or
exciter armature. When shorted, the generator set field and
exciter armature become hot enough to cause severe burns.
Exciter Armature Test
1. Disconnect the generator set engine starting
battery, negative (--) lead first.
2. Remove the end bracket. See Section 7.9, End
Bracket Removal and Replacement and Section 8,
Disassembly/Reassembly for end bracket
removal.
3. Disconnect the AC leads from the SCR assembly.
4. With an ohmmeter, check for continuity across the
AC leads. See Figure 7-16.
5. Repair the AC leads if they are damaged or open.
Solder and insulate any splices used. Use new
sleeving when tying the leads to the shaft or the
heat sink.
6. Visually check the exciter armature for shorted
winding(s); with an ohmmeter check for low
resistance readings. See Section 1,
Specifications, Generator, for designed resistance
readings. See Figure 7-16. Low resistance
readings indicate a faulty exciter armature
requiring replacement of the rotor assembly.
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