18
TROUBLESHOOTING – GENERATOR
As with any machine, trouble may develop in electrical generators. It may be due to long service
or neglect of regular maintenance. Servicing, and checking. Should trouble develop, the follow-
ing instructions will be helpful in tracing the cause and making repairs.
SPEED DEVIATIONS:
The generator speed should be maintained at rated nameplate speed. The frequency and volt-
age of the generator output depends on speed. If the generator runs slower than rated speed,
the voltage will drop off.
NO VOLTAGE
CAUSE
CHECK AND REMEDY
Loss of residual magnetism in Flash Field.
exciter field poles.
Open in stator windings Check for continuity in windings. Return to factory
for repair if open
Open or short in rotating rectifiers. Check rectifiers.
Short Circuited. Clear lead to restore voltage build–up.
Open in alternator field Check for continuity and return rotor to factory for
repair if field coils are open.
Shorted exciter armature Check for short and replace if faulty.
Shorted leads between exciter Test and repair
armature and generator field.
LOW VOLTAGE
CAUSE
CHECK AND REMEDY
Excessive load. Reduce load. With 3 phase generators, the load on
each leg should be as evenly balanced as possible
and should not exceed the rated current on any leg.
Low Speed. Check engine for malfunction or system for over-
load.
Line loss. Increase size of line lead wire.
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