Bt Generator Troubleshooting (Single Phase) - Westerbeke 11.5KW-60Hz Service Manual

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BT GENERATOR TROUBLESHOOTING/3 PHASE
NOTE:
AC
generator troubleshooting must be pe>jormed with the engine operatin at 60 Hz.
FAULT
PROBABLE CAUSE
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.
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EXCITER
STATOR', I
1. Short or open in the
main stator winding.
2.
Shorted suppressor
on exciter rotor.
3. Four or more shorted Or
open diodes on exciter rotor.
1.
Blown 6 AMP fuse
auxiliary circuit AVR.
2. Faulty voltage regulator
1. Open or shorted diodes in.
exciter rotor 1 to 3 diodes.
2. Shorted exciter rotor winding.
1.
Faulty voltage regulator.
1.
STB pod on regulator
needs adjustment.
1. Diode(s) on exciter rotor
breaking down when load is
applied (inductive) 1-3 diodes.
4. Open in exciter
stator winding.
5. Open in rotating
field winding.
3. Shorted or open main
stator auxiliary winding.
3. Faulty voltage regulator.
2. Faulty voltage regulator.
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WESTERBEKE
Engines &
Gener~tors
87