Be Troubleshooting - Westerbeke 8.0KW-60HZ Operator's Manual

PROBLEM
No AC voltage output at no load.
Residual voltage produced at no load
15 - 20 volts AC.
Low AC voltage output at no load
60 -100 VAC.
High AC output voltage
150 VAC or higher.
Unstable voltage output.
AC voltage drop under load
60 - 100 volts AC.
BE TROUBLESHOOTING
NOTE:
AC GENERATOR TROUBLESHOOTING MUST
BE PERFORMED WITH ENGINE OPERATING AT 60 HERTZ.
PROBABLE CAUSE
1. Short or open in the 4. Open in exciter
main stator winding. stator winding.
2. Shorted pozi-resistor 5. Open in rotating
on exciter rotor. field winding.
3. Four or more shorted or
open diodes on exciter rotor.
1. Faulty voltage regulator. 3. Shorted or open main
stator auxiliary winding.
2. Short or open to wiring
to voltage regulator.
1. Reset voltage potentiometer. 4. Faulty voltage regulator.
2. Open or shorted diodes in
exciter rotor 1 to 3 diodes.
5. Short in exciter stator winding.
3. Open or shorted exciter 6. Short in rotating field winding.
rotor winding.
1. Reset voltage potentiometer.
2. Faulty voltage regulator.
1. Adjust voltage regulator. 2. Faulty voltage regulator.
1. Diode(s) on exciter rotor.
breaking down when load is
applied (inductive) 1-3 diodes.
Engines & Generators
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