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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 follows in this section. Refer to these diagrams when troubleshooting or servicing electrical
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.
a
AMP
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
connected to its battery. As this only amounts to about
18 amp-hours in a month, it is unnecessary to be con-
cerned with this slight discharge during normal seasonal
operation. If the generator set were to be unattended for
many months, the two easiest ways to stop this slight
drain is to first tum 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.
IGNITION
FUSE
Should the generator shutdown from an overspeed condition, the overspeed circuit
fI' ! .IJ.St.
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
-1
coil connection from the overspeed switch and tape the terminal end with electrical
tape.
Do not
operate the generator with the overspeed switch bypassed. Bypass the overspeed switch only
for testing purposes. Replace the overs peed 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) for the generator set covered by this 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
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