CONTROL PANEL (TYPE 4)
SYSTEMS OPERATION
Return of Commercial (Normal) Power
When commercial power returns. the automatic transfer switch
transfers the load to commercial power. Remote start initiating contacts
(I) open. This de-energizes run relay (RR).
When run relay (RR) is de-energized, contacts (RR2) close and
contacts (RR1) open. (RR2) closed completes a circuit to shut-off
solenoid (SS). The shut-off solenoid moves the rack to the fuel OFF
position. After the engine stops (PSW) will open to de-energize the shut-
off solenoid. (RR1) open deenergizes arming relay (AR) and dual speed
switch (DSS).
Diode (D1) is in the shut-off solenoid circuit to help prevent electrical
sparks (arcing), at the shutoff solenoid contacts, when the shut-off
solenoid is de-energized.
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