Safety Shutdown Switches - Westerbeke 5.0KW BCG-60Hz Operator's Manual

SAFETY SHUTDOWN SWITCHES
SAFETY SHUTDOWN SWITCHES
The engine is protected by a variety of shutdown switches.
Should a shutdown occur. do not attempt to restart withqut
finding and correcting the cause. Refer to the heading
Engine slarts, runs and then shuts down in the ENGINE
TROUBLESHOOTING section of this manual.
The following is a description of these automatic shutdown
switches:
Exhaust Temperature Switch
An exhaust temperature switch is located on the exhaust
elbow. Nonnally 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-
132°C). This switch resets at approximately 225"F (I07"C).
EXHAUST
TEMPERATURE
SWITCH
Waler Temperature Switch
EXHAUST
ELBOW
A high water temperature switch is located at the thennostat
housing. Nonnally closed, this switch, should the fresh water
coolant's operating temperature reach approximately 210°F
(99°C), will open and interrupt the DC voltage to the K2 run
relay therebyshutting off the engine. This switch resets at
195"F (107"C).
WATER (COOLANT)
TEMPERATURE
SWITCH
OIL FILTER
ASSEMBLY
low
Oil
Pressure
Switch
Oil PRESSURE SWITCHES
Dual low oil pressure switches are located off the engine's oil
gallery manifold. One is nonnally open when the engine is in
a static stale. 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.
generators. 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
further 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
generators engine by interupting DC voltage
to
the K2 run
relay if the engine's speed runs to high. After correcting the
problem, this switch can be reset by momentarily depressing
the stop switch. Refer
to
the WIRING DIAGRAMS in this
manual.
OVERSPEED
CIRCUIT BOARD
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 repruring the fault. reset the breaker and restart the
generator.
Engines
&
Generators
10