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SECTION 4.2
OPERATIONAL ANALYSIS
PART 4
DC CONTROL
Page 4.2-13
ENGINE
SHUTDOWN
Following retransfer back to the "Utility" source,
an "engine cool-down timer" on the circuit board
starts timing. When that timer has timed out
(approximately one minute), circuit board action
will de-energize the circuit board’s run relay
(K2). The following events will then occur:
The DC circuit to Wire 14 and the fuel
solenoid (FS) will be opened. The fuel
solenoid (FS) will de-energize and close to
terminate the engine fuel supply.
The hourmeter (if equipped) connected to
Wire 14 will be opened and clock function of
the hourmeter will stop.
The battery charge relay (BCR) connected to
Wire 14 will be de-energized. This will cause
transformer (TX) voltage to power the battery
charger again.
Circuit board action will connect the engine’s
ignition shutdown module (ISM) to ground, via
Wire 18, circuit board Pin 13, and Wire 0.
Ignition will be terminated.
Without fuel flow and without ignition, the
engine will shut down.
Figure 7. Circuit Condition -
Retransfer to “Utility” and Engine Shutdown