Dc Electrical System; 12-Volt Dc Control Circuit; Batteries; Specifications - Westerbeke 4.5 KW BCGTC - 60 Hz Operator's Manual

DC ELECTRICAL SYSTEM
12-VOLT DC CONTROL CIRCUIT
The DC Circuit on the BCGTC functions to start, operate and
stop the generator's engine. The circuit is best understood by
reviewing the DC Wiring Diagram and Wiring Schematic.
The engine's DC wiring is designed with three simple basic
circuits: start, run and stop.
The engine has a 12 volt DC electrical control circuit that is
shown on the Wiring Diagrams. Refer to these diagrams
when troubleshooting or when servicing the DC electrical
system or the engine.
BAmRIES
A
CAUTION:
To avoid damage to the banery charg-
ing circut, never shut off the engine banery switch
while the engine is running. Shut off the engine banery
switch, however, to avoid electrical shorts when work-
ing on the engine's electrical circuit.
Specifications
The minimum recommended capacity of the battery used in
the engine's 12-volt DC control circuit is 300 CCA.
Battery Maintenance
Review the manufacturer's recommendations and then estab-
lish a systematic maintenance schedule for your engine's
starting batteries and house batteries.
• Monitor your voltmeter for proper charging during engine
operation.
• Check the electrolyte level and specific gravity with a
hydrometer.
• Use only distilled water to bring electrolytes to a proper
level.
• Make certain that battery cable connections are clean and
tight to the battery posts (and to your engine).
• Keep your batteries clean and free of corrosion.
A
WARNING:
Sulfuric acid in lead baneries can
cause severe burns on skin and damage clothing. Wear
protective gear.
BATTERY CHARGING
The generator supplies a continuous 17 amp charge from its
battery charger to the starting battery.
BATIERY
CHARGER
COMPONENT TESTING
BLACK
GREEN
YELLOW
RED
All DC voltage measurements are made to the engine battery
negative ground point unless specified otherwise. In making
test measurements, make sure that a good ground for the
meter is established, preferably the point where the negative
battery is connected to the engine. Battery positive voltage is
indicated as B+ and should measure no Jess than 11.5 volts.
AC voltage measurements should be made with a true RMS
AC meter to insure measurement accuracy.
Relay. The relays used in the control system have coils
which are polarized by the fact that they have internal free
wheeling suppression diodes across them. Relay coil terminal
86 must be maintained
(+),
tenninaI85(-). The relay coil is
rated 12V DC, and the coil resistance is typically 85 ohms.
With B+ on terminal 86, direct grounding of terminal 85 is
permissible for testing purposes.
~ WESTERBEKE
Engines
&
Generators
18