AUTOMATIC START/STOP SYSTEMSYSTEMS OPERATIONELECTRIC SHUTOFF AND ALARM SYSTEMINTRODUCTIONThere are three types of electrical protection systemsavailable for the 3300 Generator Set Engines.1.Oil Pressure and Water Temperature Protection.2.Oil Pressure, Water Temperature and Over-speed Protection.3.Automatic Start Stop Systems.a.Package Generator Set.b.Non-Package Generator Set.This manual has information for No. I and 2. Makereference to the Generator manual and the Switch-gearmanual for information for No. 3.The electric shut-off system is designed to giveprotection to the engine if there is a problem or a failurein any of the different engine systems. The enginesystems that are monitored are: engine over-speed,starter motor crank terminate, engine oil pressure andengine coolant temperature.The electric protection system consists of the electronicspeed switch and time delay relay. This system monitorsthe engine from starting through rated speed.Dual Speed Switch (DSS) The speed switch hascontrols (in a single unit) to monitor engine over-speedand crank terminate speed.Engine Over-speed An adjustable engine speed setting(normally 118% of rated speed) that gives protection tothe engine from damage if the engine runs too fast. Thiscondition will cause a switch to close that shuts off thefuel to the engine.Crank Terminate (Starter Motor) An adjustable enginespeed setting that gives protection to the starter motorfrom damage by over-speed. This condition will cause aswitch to open that stops current flow to starter motorcircuit, and the starter motor pinion gear will thendisengage from engine flywheel ring gear. The crankterminate can also be used to activate the time delayrelay.Time Delay Relay This relay has special ON OFFswitches with two controls that will either make the relayactivate immediately, or after a 9 second delay. The timedelay relay is used to arm the shutdown system. Thetime delay relay has a 70 second delay to be sure ofcomplete engine shutdown and to prevent damage to theshutoff solenoids.Water Temperature Contactor Switch This contactorswitch is a separate unit (mounted in the water manifold)that is wired into the shutdown circuit. It has an elementthat feels the temperature of the coolant (it must be incontact with the coolant). When the engine coolanttemperature becomes too high, the switch closes tocause the fuel to be shut off to the engine.Engine Oil Pressure Switch This switch is mounted atthe rear of the engine and feels the pressure of the oil inthe oil manifold. The oil pressure switch is used todetermine low engine oil pressure and to activate thetime delay relay.21
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