Safety Shutdown Switches - Westerbeke 4.5KW BCGB-60HZ Operator's Manual

SAFETY SHUTDOWN
SAFETY SHUTDOWN SWITCHES
The engine is protected by a variety of shutdown switches.
Should a shutdown occur, do not attempt to resfllrt without
finding and correcting the cause. Refer to the heading
Engine starts, runs and then shuts down in the ENGINE
TROUBLESHOOTING
section of this manual.
The following is a description of these automatic shutdown
switches:
High Exhaust Temperature SWitch
An exhaust temperature switch is located on the exhaust
elbow. NonnaJly closed, this switch will open and interrupt
the DC voltage
to
the K2-run relay (shutting off the engine)
should the switch's sensor indicate an excessive exhaust tem-
perature (an inadequate supply of raw water causes high
exhaust temperatures). This switch opens at 260-270"F (127-
!32°C). This switch resets at approximately 225°P (107°C).
High Water Temperature Switch
A high
water
temperature switch is located at .the thermostat
housing. NonnaJly closed, this switch, should the fresh water
. coolant's operating temperature reach approximately 210
0
P
(99°C), will open and interrupt the DC voltage to the K2 run
relay thereby shutting off the engine. This switch resets ~t
195"F (107°C).
TEMPERATURE
TEMPERATURE
SWITCH
lOW OIL
PRESSURE
SWITCHES
Low Oil Pressure SWitch
OIL FILTER
Dual low oil pressure switches are located off the engine's oil
gallery manifold. One is normally open when the engine is in
a static state, This switch functions in the automatic shutdown
circuit when the unit is operating (5 psi rating). The second
oil pressure switch is installed only on SEA RAY spec. gener-
ators. This switch is nonnally closed and functions in their
low oil pressure alarm system (10 psi rating).
Should the oil pressure
drop
to 10 psi while the generator is
operating, the SEA RAY spec. switch will close activating
their low oil pressure alarm. Should the oil pressure drop fur-
ther to 5 psi, the automatic shutdown circuit switch will open
interupting DC voltage to the K2 run relay thereby shutting
off the generator.
High RPM Shutdown SWitch
An overspeed switch in the DC circuit shuts off the
OVERSPEED
BOARD
CIRCUIT
generators engine by interupting DC voltage to the K.2 run
relay if the engine's speed reaches 2175 rpm(approximately) .
After correcting the problem, this switch can be reset by
momentarily depressing the stop switch. Refer to the
WIRING
DIAGRAMS
in this manual.
Engine Circuit Breaker
The generator's engine is protected by an engine mounted
manual reset circuit breaker (20 amps DC). Excessive current
draw or electrical overload anywhere in the instrument panel
wiring or engine wiring will cause the breaker to trip. In this
event the generator will shut down because the opened
breaker interrupts the DC circuit to the K2-run relay. If this
should occur, check and repair the source of the problem.
After repairing the
faul~
reset the breaker and restart the
generator.
Engines
&
Generators
11