Westerbeke 9.0 BCG Technical Manual page 193

FAULT
Voltage correct at
NIL
but at F/L with
loss of engine rpm (Hertz).
Unstable voltage.
CAUSE
1. Generator overload.
2. Low power factor
load (motor loads).
1. Engine's rpm
fluctuating.
CORRECTION
1. Check data plate and ,
monitor load on gene-
rator with amp-probe.
2. Check type of load
applied. Consider use of
optional regulator board.
1. Check engine operation
and fuel system.
The following is a list of faults with the generator operating on electronic (ELEC) regulation. Selector switch
is in the ELEC position with an A.V.R installed.
Voltage correct at
NIL and loss of
voltage at F/L
High voltage at NIL
with no adjustment
from regulator
potentiometer.
Low voltage at NIL
and F/L No adjustment
from regulator board
potentiometer.
Low voltage at NIL (0 - 50 volts)
with growling noise from
generator and loss of engine
speed when load is applied.
1. Diode in exciter
rotor 8-2 shorted.
1. Regulator board
defective.
1. Regulator board
defective.
2. Exciter stator
winding A-1 open.
1. Main stator
windings shorted,
C-1,C-2.
187
1. Check diodes as explained
later in this manual,
pages 191-192.
1. Replace regulator
board. Adjust NIL voltage
with transformer; then
switch to ELEC and adjust
with A.V.R potentiometer.
1. Replace regulator
board and adjust voltage
as above.
2. Check resistance values
of C-3 and D-3 windings
and their connections.
1. Check continuity and
resistance values of
C-1 and C-2 windings
and their connections.
Westerbeke Generators