Defective diodes.
Broken
or
shorted
exciter
or
main
rotor leads.
Defective exciter
Improper phase rotation
in rewound exciter
stator
or
main stator.
Check rectifier assy. Repair
or
replace as necessary.
Test and repair or replace.
Inspect for damaged
or
burned
or
main
rotor
or
main
rotor
windings.
Check resistance with Kelvin bridge. Megger for short
to
core. Return
to
factory
or
take to service shop to effect repairs.
Reverse
tag
rewound component.
SYMPTOM:
GENERATOR
PRODUCES
LOW
VOLTAGE,
NO
LOAD
CAUSE
CHECK
AND
REMEDY
Faulty metering.
Check voltage with separate meter at generator terminals.
Low
Speed
Check driver for proper speed. Adjust as necessary.
High resistance connections. Check
all
tenninations. Re-make as necessary.
Faulty diodes. Check rectifier assy.
Faulty main rotor. Check main rotor pole windings.
If
winding appears to bulge mid-way
down body
of
pole, refer to service shop,
or
return
to
factory for
sefV!ce.
SYMPTOM:
GENERATOR
PRODUCES
LOW
VOLTAGE
WHEN
LOAD
APPLIED
CAUSE
Driver speed droop.
Excessive load.
CHECK
AND
REMEDY
Check engine.
For
proper operation, engine must be running
approximately
1800 RPM. Adjust governor as necessary.
Reduce load. With 3 phase units, the load
on
each leg should be as
balanced as possible, and should not exceed rated current
on
any leg.
SYMPTOM:
GENERATOR
PRODUCES
FLUCTUATING
VOLTAGE
(May be indicated by light flicker)
CAUSE
Irregular engine speed.
Loosetenninallugs
or
screws.
CHECK
AND
REMEDY
Check engine for malfunction,
or
load for fluctuation.
Make
better connection both mechanically and electrically.
17
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