CONTROL PANEL (TYPE 3)
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 shutoff 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 de-energizes arming relay (AR) and dual
speed switch (DSS).
Diode (D1) is in the shut-off solenoid circuit to help prevent electrical
sparks (arching), at the shut-off solenoid contacts, when the shut-off
solenoid is deenergized.
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