How it works (continued) – Generac Power Systems NP-40G User Manual
Page 85
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Section 6.1- ENGINE DC CONTROL SYSTEM
CRANKING (CONT’D):
3. Engine Controller circuit board action operates
the automatic choke.
NOTE: Also see Section 3.5. “AUTOMA TIC CHOKE”
and Section 6.2, "ENGINE CONTROLLER BOARD”.
RUNNING:
With fuel flow and Ignition available, the engine
starts and runs. The operator releases the Start*
Run-Stop switch to its "RUN" position.
1. The Wire 18 circuit Is now open to ground. Circuit
board action terminates the 12 VDC to the Starter
Contactor (SC). The SC contacts open and crank
ing ends.
2. Choking action ends and the carburetor choke
plate is positioned by the Choke Heater (CH).
3. Circuit board action continues to power the Wire
14 circuit- fuel flow and ignition continue.
How it Works (Continued)
NORMAL SHUTIDOWN:
When the Start-Run-Stop switch is held at
"STOP", the Wire 18 circuit Is connected to frame
ground. Engine Controller circuit board action
then terminates the DC flow to the Wire 14 circuit.
1. Fuel Pump (FP) shuts down.
2. Ignition terminates.
3. Engine shuts down.
NOTE: Connection of the circuit board’s Wire 18 or
Wire 18B circuit to frame ground will always result
In engine shutdown. Note that Wire 18B is routed
to the CCG circuit board, giving that circuit board
engine shutdown capability.
ENGINE PROTECTIVE DEVICE SHUTDOWN:
Refer to "Oil Filter Support" on Page 5.1-3 and
Section 6.5. The engine mounts a Low Oil Pressure
Switch (LOP) and a High Oil Temperature Switch.
Page 6.1-2