Nilfisk-Advance CS7000 Fuel Cell EcoFlex, Service Manual

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Engine System - LPG 168 Service Manual – CS7000
Lost Oil Pressure Shutdown
• If the engine oil pressure is lost, the oil pressure switch will close causing the low oil pressure shut down
relay to energize taking power away from the “closed at rest” contact. This removes the power from the
run enable signal to pin 8 of the Woodward L series actuator. The actuator immediately switches off
the internal ground for the shut down control circuit at pin 9 causing the ignition request relay to de-
energize. This shuts down the ignition system and the carburetor fuel shut off solenoid causing engine
to stall immediately. The high coolant temp shut down relay also energizes, removing power through the
closed at rest contacts to the fuel lock off solenoid.
• When the low oil pressure shut down relay energizes, power is also lost for the engine run signal to
the main machine controller. The loss of the engine run signal is interpreted as “loss of oil pressure”
by the main machine controller. It responds by immediately displaying an engine warning message to
the operator and removing the 12v power going out to the ignition request circuit. If the engine has not
already shut down, the system will then shut down as if the operator had shut off the key (Normal engine
shut off).
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
SHUTDOWN Control
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.
SHUTDOWN RELAY
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
5v