ARMY TM 9-6115-644-10AIR FORCE TO 35C2-3-446-11MARINE CORPS TM 09249A/09246A-10/1SECTION III. TECHNICAL PRINCIPLES OF OPERATION1-10 INTRODUCTION. This section contains func-tional descriptions of the generator set and explainshow the controls and indicators interact with the sys-tem.1-11 ENGINESTARTINGSYSTEM.The Engine Starting System (Figure 1-3), consists of two12-volt batteries connected in series, a starter, a 24 voltbattery charging alternator, a magnetic pickup (for sensingengine speed) and the related switches and relays requiredfor control of the starting system. For engine cranking,battery power is supplied to the starter motor through thestarter solenoid which in turn is controlled by the crankingrelay. The starter then engages the engine flywheel caus-ing the engine to turnover. For engine starting, the DEADCRANK switch must be in the NORMAL position, theDC Control power circuit breaker must be pushed in, theEMERGENCY STOP switch must be in the OUT posi-tion and the MASTER SWITCH is moved to the STARTposition. The cranking relay is then controlled by a circuitconsisting of the start relay and crank disconnect switch.As the engine accelerates to the preset speed (sensed bythe magnetic pickup), the crank disconnect switch opensand deenergizes the cranking relay to stop and disengagethe starter. 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 System1-12 Change 1
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