Engine System - LPG 162Service Manual – CS7000
Ignition On
• When the main machine controller sees the key switch input, it sends 12v out on the Ignition Request
circuit.
• When the actutor receives 12v at pin 1, it “wakes up”.
• The actuator provides a ground through itself for the shut down control circuit.
– The ignition request relay is energized (as long as there is not a shutdown condition within the
L-Series actuator) passing battery power to the ignition system, carburetor fuel shut off solenoid and
the low oil press. shutdown relay common contact at pin 3.
• Ignition power is provided to the common contact at pin 3 of the high coolant temp. shutdown relay and
the common contact at pin 3 of the control relay.
– Since there is no oil pressure, the oil pressure switch is closed causing the Low oil pressure shutdown
relay to be energized. This prevents power from being passed to the “engine run” input into the main
machine controller.
– The high coolant temp. shutdown relay coil is also grounded through the closed oil pressure switch
causing it to be energized. This prevents power from being passed to the fuel lock-off solenoid.
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
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