7-24 Component Testing and Adjustment TP-5606 6/02
3. Check exciter armature for a grounded condition.
Using a megohmmeter, apply 500 volts DC to
either armature lead and armature frame. (Follow
the instructions of the megohmmeter
manufacturer when performing this test.) See
Figure 7-22. A reading of approximately 500K
ohms (1/2 megohm) and higher indicates the
exciter armature is good. A reading of less than
500K ohms (approximately) indicates
deterioration of winding insulation and possible
current flow to ground. Repair or replacement of
the exciter armature is necessary.
Exciter
Armature
Exciter
Field
Main Field
710
Stator Windings
Rectifier
Module
AC
AC
+
-
Megohmmeter
Frame
Connection
Figure 7-22. Megohmmeter Connections
on Exciter Armature
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