
ELECTRICAL SYSTEM
Engine
12·Voll DC
Control
Circuit
The engine that drives the generator end has a 12-Volt DC electrical control circuit, as shown on the wiring
diagrams which follow on pages
44 and 45. 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.
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
14th
of
an Amp) at all times once the generator
is
connected
to
tts
battery.
As
this only amounts
to
about 18 Amp-hours in a
month,
it
is unnecessary
to
be concerned with this slight dis-
charge 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 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 gen-
erator-mounted control panel.
Should the generator shutdown from
an
overs peed condition,
the overspeed circuit must be reset in order to restart the gen-
erator. 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
B
RMP
IGNITION
FUSE
end with electrical tape. DO NOT operate the generator with the overspeed swttch bypassed. Bypass the
overspeed switch only for testing purposes. Replace the overspeed switch
to
maintain this safety circuit's
integrtty.
Battery
Specification
The minimum recommended capacity of the battery used in the engine's 12-Volt DC control circuit is
90
-
125 Ampere-Hours (minimum) for the generator sets 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.
41
Westerbeke Generators
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