Westerbeke 9.0 BCG Technical Manual page 192

FAULT
High voltage at NIL
and F/L
(continued)
Low voltage at NIL
(0 - 50
volts) with
growling noise from
generator and loss of
engine speed when load
is applied.
Generator does not
excite; voltage is
o
volts at NIL
Low voltage at NIL;
when load is applied,
voltage drops.
Low voltage at NIL
and FIL
50 - 70
volts.
Westerbeke Generators
CAUSE
2. Short in compound
transformer auxiliary
windings 0-3.
1. Main stator
windings shorted
C-1, C-2.
1. Generator's engine
speed (rpm) is slow.
2. Short in main stator
windings or in
transformer.
1. Oiode(s) in rotating
exciter (B-2)shortened
2. Bridge rectifier
defective.
3. Auxiliary windings
B-1 shorted.
4. Auxiliary windings
0-3 and
lor
C3
open.
1. Exciter stator
windings A-1 & A-2
are open.
2. Generator's engine
speed (rpm) is low.
186
CORRECTION
2. Check continuity and
connections of 0-3
windings.
1. Check continuity and
resistance values of
C-1, C-2 windings and
connections.
1. Adjust engine's speed and
adjust NIL Voltage.
2. Check main stator and trans-
former winding resistances.
Artificially excite the generator
and note the results.
1. Check diodes in rotating
exciter as explained
later in this manual,
pages 191-192.
2. Follow test procedure
for bridge rectifier.
3. Check continuity and
resistance values.
4. Check continuity and
resistance values of
windings and connec-
tions.
1. Check continuity and
resistance values of A-1
and A-2 windings.
2. Check generator NIL
rpm and adjust NIL
voltage.