CONTROL PANEL (TYPE 3)SYSTEMS OPERATIONManual ShutdownWhen engine control switch (ACS) is turned to the STOP or OFFposition, contacts (9 or 10) close and contacts (2 and 3) are both open,no shutdown indicators can operate. (9 to 10) closed completes a circuitto shut-off solenoid (SS). The shut-off solenoid moves the rack to thefuel OFF position. (2 and 3) open deenergizes run relay (RR).When run relay (RR) is de-energized, contacts (RR2) close andcontacts (RR1) open. (RR2) closed completes a parallel circuit to shut-off solenoid (SS). This circuit is necessary to stop the engine when theengine control switch is in the AUTO or MAN position. After the enginestops, (PSW) will open to deenergize the shut-off solenoid. (RR1) opende-energizes arming relay (AR) and dual speed switch (DSS).Diode (D1) helps prevent electrical sparks (arcing), at the contacts inthe shut-off solenoid circuit when the shut-off solenoid is de-energized.206
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