Engine System - LPG 166Service Manual – CS7000
Step Two
The engine continues to run until it uses up the fuel that was trapped in the vaporizer/regulator. When the
engine stalls, and loses oil pressure, the oil pressure switch closes, energizing the low oil pressure shut down
relay. This removes power from the power relay coil causing it to de-energize and remove power from the
ignition request relay. This de-energizes the ignition request relay causing the ignition system to shut down
and turns off the carburetor fuel shut off solenoid stopping the ow of any remaining fuel.
When the power relay de-energized, it also removed power from the control relay coil, low oil pressure shut
down relay coil, high coolant temp shut down relay coil and pin 1 of the Woodward L series actuator. This
“turns off” the actuator which, releases the switched to ground connection through pin 9 of the actuator.
2
1
3
5
4
IGN. REQUEST
MAIN
CONTROLLER
FUEL
LOCK-OFF
SOLENOID
OIL SWITCH
(OPEN FOR
PRESSURE)
TEMP. SWITCH
(OPEN FOR
NORMAL TEMP.)
RUN ENABLE SIGNAL
SHU TDOWN Cont rol
CRANK REQUEST
IGNITION REQUEST
ENGINE RUN (12V INPUT)
HIGH COOLANT TEMP Signal
SPEED 2 (12V OUTPUT)
SPEED 3 (12V OUTPUT)
Eng. RPM
Sensor
STARTER
12v BATTERY
ALTERNATOR
IGNITION POWER
FOR IGNITER &
HIGH COOLANT TEMP.
SH UT DOW N RE LAY
1
5
4
3
2
CONTROL
RELAY
1
5
4
3
2
IGNITION
REQUEST RELAY
POWER
RELAY
1
5
4
3
2
LOW OIL PRESS.
SHUTDOWN
RELAY
1
5
4
3
2
CRANK
REQUEST
RELAY
1
2
5
6
7
8
9
10
11
12
WOODWARD
L-SERIES
ACTUATOR
3
4
1 2 3
Main Machine
Controller
Carb.
Fuel
Shut Off
Solenoid
85
86
87
87a
30
Engine Protection Modes
The engine will be shut off in the event that it overheats or loses oil pressure after it has been running. The
main machine controller will display a warning message to the operator for either case and will also initiate
an engine shut down as a back up measure.
In the case of lost oil pressure, the Woodward L series actuator disables the ignition system by de-energizing
the Ignition Request relay.
In the case of the engine overheating, the high coolant temperature shut down relay shuts the engine off by
removing power from the fuel lock off solenoid causing the engine to run out of fuel and stall.
To Next Page
Loading...
Need help?
General
