TP-6255 7/06
66
Section 8 Component Testing and Adjustment
8.4 Exciter Armature
The exciter armature supplies excitation current to the
generator main field through the rectifier module. Test
the exciter armature as described in the following steps.
Exciter Armature Test Procedure:
1. Disassemble the alternator. Refer to Section 9.
2. With the alternator disassembled, disconnect the
armature leads from the rectifier module AC
terminals. Refer to Section 10.
3. With an ohmmeter on the R x 1 scale, check the
resistance across the exciter armature leads. See
Figure 8-6. See Section 1, Specifications for the
armature resistance. No continuity indicates an
open armature winding. If the resistance test is
inconclusive, perform a megohmmeter test on the
exciter armature as described in the next step.
Note:
Most
ohmmeters
will
not
accurately
measure less than one ohm. Consider the
exciter armature functional if the resistance
reading (continuity) is low and there is no
evidence of
a shorted
winding (heat
discoloration).
4. Check
the
exciter
armature
winding
for
a
short-to-ground condition. Use a megohmmeter to
apply 500 volts DC to either armature lead and the
armature frame.
Follow the megohmmeter
manufacturer’s
instructions
for
using
the
megohmmeter.
See Figure 8-7.
A reading of
approximately 1.5 MOhms and higher indicates the
exciter armature is functional. A reading of less
than
approximately
1.5
MOhms
indicates
deterioration of the winding insulation and possible
current flow to ground; if so, replace the exciter
armature.
F+
F--
AC
AC
AC
1
2
3
4
5
6
TP-5983-7
1. Main field (rotor)
2. Stator windings
3. Rectifier module
4. Ohmmeter
5. Armature
6. Exciter field
Figure 8-6
Exciter Armature Ohmmeter Test
F+
F--
AC
AC
AC
1
2
3
4
5
6
7
TP-5983-7
1. Main field rotor
2. Stator windings
3. Rectifier module
4. Megohmmeter
5. Shaft connection
6. Armature
7. Exciter field
Figure 8-7
Megohmmeter Connections on
Exciter Armature
Содержание 6.5-27EFOZD
Страница 1: ...Marine Generator Sets Models 8 32EOZD 6 5 27EFOZD TP 6255 7 06a Service ...
Страница 12: ...TP 6255 7 06 12 Service Assistance Notes ...
Страница 22: ...TP 6255 7 06 22 Section 1 Specifications Notes ...
Страница 28: ...TP 6255 7 06 28 Section 3 Intake and Exhaust System Notes ...
Страница 62: ...TP 6255 7 06 62 Section 7 Controller Notes ...
Страница 78: ...TP 6255 7 06 78 Section 8 Component Testing and Adjustment Notes ...
Страница 87: ...TP 6255 7 06 87 Section 10 Wiring Diagrams GM46351 Figure 10 2 Wiring Diagram for 9EOZD 7EFOZD Model ...
Страница 88: ...TP 6255 7 06 88 Section 10 Wiring Diagrams ADV6845A F Figure 10 3 Wiring Schematic for All Models ...
Страница 89: ...TP 6255 7 06 89 Section 10 Wiring Diagrams ADV6845B F Figure 10 4 Wiring Diagram Schematic for All Models ...
Страница 92: ...TP 6255 7 06 92 Section 10 Wiring Diagrams Notes ...
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