Safety Shutdown Sensors/Switches - Westerbeke 6.5 MCG 60HZ Operator's Manual

SAFETY SHUTDOWN SWITCHES
SENSORS AND SENDERS
DESCRIPTION
The engine/generator is protected by switches and sensors
that send signals to the ECU that it interprets as a fault and
automatically shuts down the generator's engine. When
an automatic shutdown occurs, one of the control panel fault
LED lights will illuminate indicating what fault caused the
engine to shutdown. This LED will stay illuminated. To ·
correct the fault, refer to ENGINE TROUBLESHOOTING in
this manual. Do not attempt to re-start the generator
before correcting the fault.
SPEED SENSOR (CRANKSHAFT)
A speed sensor is mounted on a bracket at the front of the
engine and positioned to monitor crankshaft rotation. It sends
a voltage signal to the ECU that is interpreted.as engine
speed. If a speed threshold is reached, either overspeed or
underspeed, the ECU will shut the generator down. If both
speed LED'S are illuminated, it indicates overspeed. If both
LED'S are flashing, it indicates underspeed.
OIL PRESSURE SWITCH
An oil pressure switch is located on the right side of the oil
filter mounting bracket. This is a normally open contact
switch. It functions with the time relay circuit to ensure DC
voltage to the circuit i_s terminated when the unit shuts down.
OIL GALLERY
An oil pressure sender (to the left of the oil filter) sends DC
voltage to the ECU that it interprets as oil pressure. Should
this voltage fall below a certain level, the ECU will shut the
generator down and illuminate the low oil pressure LED.
Should this occur, refer to ENGINE TROUBLESHOOTING
in this manual.
EXHAUST TEMPERATURE SWITCH
A temperature switch is mounted on the exhaust elbow to
monitor the temperature of the exhaust coolant and gases.
Should the switch sense an excessive exhaust temperature,
the ECU will shut the generator down and the exhaust
temperature LED will illuminate on the control panel.
EXHAUST
TEMPERATURE•
SWITCH
COOLANT TEMPERATURE SENSOR
EXHAUST
This sensor is located on the underside of the intake manifold
to monitor the engines coolant temperature. The sensor is
sending DC voltage to the ECU that interprets this as engine
coolant temperature. Should the temperature reach an over-
heat threshold, the ECU will shut the engine down and will
illuminate the engine temperature fault LED light on the con-
trol panel.
DC CIRCUIT BREAKER
\h~
)
~~-
The engines electrical system is protected
by a 15 amp manual reset circuit breaker.
An electrical overload in the wiring hamess
or the instrument panel will trip the breaker
and shut down the engine/generator. Should
this occur, inspect and repair the problem.
Then reset the breaker and re-start the engine.
FUSE PROTECTION
Three fuses protect the engine's DC electrical system. A 30
amp spade type fuse in a holder adjacent to the starter motor.
An 8 amp fuse and 30 amp buss type mounted on the control
box.
Engines & Generators
10