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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
Generator and Excitation Circuit (cont.)
Trouble, Symptom & Condition
No (or low) generator output
voltage in all phases.
Generator operating at 400 Hz
in AUTOMATIC mode.
(Continued)
March 28/94 Revised
Probable Cause
f. Defective ballast
resistor(s), (See Fig. 3).
g. Defective Amphenol
connector at voltage
regulator, or defective
wiring from regulator to
exciter field.
CAUTION: A grounded
DC voltage such as from
the generator set must
NOT be used for applying
test voltage. DAMAGE
WILL RESULT TO THE
VOLTAGE REGULATOR
CIRCUITRY.
h. Defective voltage
regulator.
Corrective Action
If output voltage was produced
when the generator set was
operated in MANUAL mode, the
resistors are good. If no voltage
was produced in MANUAL mode,
resistors could be defective. Refer
to Fig. 5 and connect a jumper
lead across the ballast resistors. If
an output voltage is now
produced, replace resistor(s) as
required.
Disconnect voltage regulator
Amphenol connector (see 1-1;
Fig. 12). Using jumper leads with
clip and prod terminals, connect
ungrounded 12-V DC to terminals
"E" and "C" in loose plug.
Connect NEGATIVE to terminal
"E". Connect POSITIVE lead to
"C" terminal (See Fig. 6). If the
generator will NOT produce a
normal voltage, replace or repair
Amphenol connector and wiring
between voltage regulator and
exciter field as required.
All components in the excitation
circuit except the voltage
regulator have been tested in
steps (1) through (4) above. This
leaves only the regulator as a
cause of trouble.
Replace complete voltage
regulator if the magnetic amplifier
regulator 430391C is used. If
solid state amplifier 489812A is
used, replace PC board.
Chapter 3-1
Page 19
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