Operator`s manual
ELECTRICAL SYSTEM
Engine
12-Volt DC
Control
Circuit
The engine that drives the generator end has a 12-volt DC electrical control circuit, as shown on the wiring
diagram which
follow on pages 38 and
39.
Refer
to
these diagrams when troubleshooting
or
servicing electri-
cal
components on the engine.
CAUTION
To
avoid damage
to
the battery's charging circuit,
never
shut
off
the
engine's
battery
switch
while
the
engine
is
running.
However, shut off the engine's battery switch
to
avoid electrical shorts when working on the
engine's electrical circuit with the engine stopped.
An overspeed shutdown switch shuts off the generator
set
should the engine's speed reach approximately 2175
rpm. This shutdown circuit consumes 25
milliamps (.25
or
1/4th
of
an amp) at all times once the generator
is
con-
nected
to
its battery. As this only amounts
to
about
18
amp-hours in a month, it
is
unnecessary
to
be concerned
with this
slight discharge during normal seasonal opera-
tion. If the generator set were
to
be unattended for many
months, the
two
easiest ways to stop this slight drain is
to
first turn off the main battery switch providing
12
volts
to
the generator set. The second way to stop this slight
drain is
to
remove the ignition fuse on the generator-
mounted
control panel.
EJ
OMP
IGNITION
FUSE
Should the generator shutdown from an overspeed condition, the overspeed circuit
~
be reset
in
order
to
restart the generator. If the overspeed switch itself
is
faulty and resetting it
by
depressing the STOP switch
will not reset
it,
lift the
T-l
coil connection from the overspeed switch and tape the terminal end with electri-
cal tape. Do
not
operate the generator with the overspeed switch bypassed. Bypass the overspeed switch
only for testing purposes. Replace the overspeed switch
to
maintain this safety circuit's integrity.
Battery
Specification
The minimum recommended capacity of the battery used in the engine's 12-volt DC control circuit
is
24 - 28
ampere-hours (minimum)
ior
the generator set covered
by
ihis manual.
CAUTION
When quick-charging the battery with an external charger, be sure to disconnect the battery
cables from the battery. Leaving the charging circuit connected while quick-charging
will
damage the diodes in the integral controller's circuitry.
35
Westerbeke Generators