ARMY TM 9-6115-641-10AIR FORCE TO 35C2-3-456-11SECTION Ill . TECHNICAL PRINCIPLES OF OPERATION1-10 This section contains functional descriptions of thegenerator set and explains how the controls and indicators1-11 The Engine Starting System (FIGURE 1-3), consists oftwo 12-volt batteries connected in series, a starter, a 24volt battery charging alternator, a magnetic pickup (forsensing engine speed) and the related switches andrelays required for control of the starting system. Forengine cranking, battery power is supplied to the startermotor through the starter solenoid which in turn iscontrolled by the cranking relay. The starter then engagesthe engine flywheel causing the engine to turn over. Forengine starting, the DEAD CRANK switch must be in theNORMAL position, the DC Control power circuit breakermust be pushed in, the EMERGENCY STOP SWITCHmust be in the OUT position, and the MASTER SWITCHis moved to the START position. The cranking relay isthen controlled by a circuit consisting of the crankdisconnect relay and crank disconnect switch. As theengine accelerates to the preset speed (sensed by themagnetic pickup), the crank disconnect switch opens andde-energizes the cranking relay to stop and disengage thestarter. The starting sequence may also be stopped bymoving the MASTER SWITCH to OFF. The engine maybe cranked without starting by use of the DEAD CRANKswitch. With the DEAD CRANK switch in the CRANKposition, the cranking relay, starter solenoid and startermotor are energized without activating any other startingor control function.Figure 1-3. Engine Starting SystemChange 1 1-11
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