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FAULT
CAUSE
ACTION
Low voltage with
no-load
1)
Too low drive engine RPM
1)
Reset nominal speed for drive engine
2)
Faulty rectifying diode bridge
2)
Replace rectifying diode bridge
3)
Capacitor with low capacitance
3)
Increase capacitor’s capacitance
4)
Winding fault
4)
Check resistance and replace damaged part
High voltage
with no-load
1)
Capacitor with too high capacitance
1)
Reduce capacitor’s capacitance
2)
Too high drive engine RPM
2)
Reset nominal speed for drive engine
Alternator does
not excite
1)
Too low drive engine RPM
1)
Reset nominal speed for drive engine
2)
Connection failure
2)
Check wiring diagram and reset correct connections
3)
Capacitor failure
3)
Replace capacitor
4)
Windings failure
4)
Check winding resistance and replace damaged part
5)
Rectifying diode bridge failure
5)
Replace rectifying diode bridge
Correct voltage
with no-load but
too low voltage
on load
1)
Rectifying diode bridge failure
1)
Replace rectifying diode bridge
2)
Low revolving speed at full load
2)
Adjust governor control to nominal speed
3)
Load is too high
3)
Reduce current supplied
4)
Load PF is too low
4)
Wire a capacitor in parallel with the lowest PF load
Noisy working
1)
Bad coupling
1)
Check and correct coupling
2)
Short circuit in windings or load
2)
Check windings and loads, and change faulty ones
3)
Faulty bearing
3)
Replace faulty bearing
Unstable voltage 1)
Uneven engine rotation
1)
Check drive engine and fix
2)
Poor contact within connections
2)
Check and tighten faulty connections
3)
Irregular load
3)
Check loads and remove irregular one
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