SAFETY
SHUTDOWN
SENSORS
AND
SWITCHES
SAFETY
SHUTDOWN
SWITCH/SENSORS
The engine
is
protected by four automatic shutdown circuits.
Should a shutdown occur,
do
not attempt
to
restart 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
circuits:
High
Exhaust
Temperature
Switch
An
exhaust temperature switch
is
located on the water
injected exhaust elbow. Normally closed contacts, this switch
will open and the
ECU will interpret this
as
a high exhaust
temperature issue and de-energize the K2 and
K3
relays,
stopping the generator.
liiGH
EXHAUST______,
.
TEMPERATURE
SWITCH
Main
AC
Circuit
Breaker
.
EXHAUST
ELBOW
The main circuit breaker at the control panel will
automatically disconnect the
AC
power if there is an
overload. This circuit breaker must be manually switched off
when servicing the engine/generator.
Engine
DC
Circuit
Breaker
'20A
CIRCUIT
iBREAKER
·MAIN
AC
CIRCUIT
BREAKER
The generator's engine DC circuit
is
protected by a rocker
type DC
20 amp breaker mounted on the control box.
This
also serves as an Emergency Stop Switch. Excessive DC
current draw or DC electrical overload anywhere in the
instrument panel wiring or engine wiring will cause the
breaker
to
trip
to
the OFF position. In this event, the DC
power
to
the ECU will be interrupted, stopping the generator.
No
panel LED will illuminate. Check and repair the source
of
the problem. After repairing the fault, reset the breaker and
restart the generator. The DC breaker must be cycled
OFF
then ON
to
clear any ECU shutdown from the ECU after the
fault situation has been repaired.
11
Fuses
A FL-15A fuse located on the control panel protects the
electrical wiring.
If
an amperage overload occurs, the
fuse
will blow and shut down the engine.
A
20A
ATM
fuse protects the battery charging circuit.
If
this
fuse fails, the engine will continue
to
run but the battery
will
not
be
cha<ging.
~
ATM
20A.FUSE
Oil
Pressure
Sensor
An oil pressure sensor
is
located off the engines oil
gallery.
Oil pressure on the sensor affects the
DC
voltage through
the
sensor to the ECU. Should the voltage reach a preset
value,
the ECU will interpret this as a low oil pressure issue
and
open the K2 run relay, stopping the generator. The oil
pressure LED on the panel will illuminate.
Oil
Pressure
Switch
The oil pressure switch sensors the engine's oil pressure. If
the oil pressure falls below 5
PSI, the switch will shut off
the
fuel pump and the engine will shut down. Thw switch will
reset itself when the oil pressure
is
restored.
Water
Temperature
Sensor
A water temperature sensor is located
at
the thermostat _
housing. This resistance
of
the sensor changes
as
a function
of
temperature. The ECU measures this resistance and
converts it to the corresponding engine coolant temperature.
When the
coolant temperature reaches the warning threshold,
the CHECK ENGINE LED on the panel illuminates. If
tlie
coolant temperature exceeds the shut-down threshold, the
ECU will·open the K2 and K3 relays shutting down
the
generator and the coolant temperature LED on the panel
will
illuminate.
High/Low
RPM
Shutdown
The ECU monitors engine rpm via the MPU )Magnetic
Pick-
Up) that is mounted under the flywheel. When the engine
speed falls or rises to a pre-set rpm level, the
ECU will shut
down the engine and the fault LED for speed will illuminate.
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