Safety Shutdown Switches - Westerbeke 10.0 EGTD Operator's Manual

SAFETY SHUTDOWN SWITCHES
DESCRIPTION
The engine is protected by a number of safety shutdown
features as described below. Should a shutdown occur, as a
result of one of these features, the Check Engine LED will
illuminate. The cause should be determined using the
troubleshooting Diagnostic Software. Once corrected, the
ECU must
be
cleared of this fault by turning OFF the 20 amp
DC breaker and then back ON in order to start the engine.
High Exhaust Temperature Switch
An
exhaust temperature switch is located on the exhaust
elbow. Normally closed, this switch will open and interrupt
the DC voltage
to
the K2 relay (shutting OFF the engine)
should the switch's sensor indicate an excessive exhaust tern-
perature (an inadequate supply of raw water causes
hjgh
exhaust temperatures). l'his switch opens at 260-270°F (127-
l320C}. This switch resets at approximately 225°F (l07°C).
·:;;::·-~:-
.~~'::---- .. EXHAUST ElBOW
/ /
Coolant Temperature Switch
h high coolant temperature switch is located on the thermostat
housing. Normally closed, this switch, should the fresh water
coolant's operating temperature reach approximately 210°F
(99°C}, will open and intermpt the DC voltage to the K2
relay, thereby shutting off the engine. This switch re&ets at
195°F (107°C).
THERMOSTAT
ASSEMBLY
9
low Oil Pressure Switcn
A low oil pressure shutdown switch is located off the engine's
oil gallery. Normally open.in a static state, this switch's sensor
monitors the engine's oil pre§sure. Should the engine's oil
pressure fall to 5-10 psi, this switch will open interrupting the
DC voltage to the K2 relay, thereby shutting off the engine.
fROM ENGINE
BLOCK
'(""".
OIL PRESSURE
SEtl!JOR
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
w~ng
or engine wiring will cause the breaker to trip. In this
event the generator will shut down and the voltage to the K2
relay is terminated. If this should occur, check and repair the
source of the problem. After repairing the fault; reset the
breaker and restart the generator.
Overspeed/Underspeed Shutdown
The unit's ECU is monitoring the engine speed via a signal
from the MPU (magnetic pick-up) positioned over the fly
wheel's ring gear teeth. Should the engine speed reach a
programmed high rpm or low rpm, the ECU will shut the
engine down and the Check Engine LED will illuminate.