ARMY TM 9-6115-464-12AIR FORCE TO 35C2-3-445-1NAVY NAVFAC P-8-624-12Section Ill. PRINCIPLES OF OPERATION1-13 lNTRODUC TION. This section contains functional descriptions of the 15 kw generator set and explains howthe controls and indicators interact with the system.1-14 ENGINESTARTINGSYSTEM.a. The engine starting system (Figure 1-6) consists of two 12-volt batteries, a starting motor and a 24-voltbattery charging alternator. With the START/RUN/STOP switch at START position, battery power is sup-plied to the starting motor through a relay and solenoid switch. The starting motor engages the engineflywheel causing the engine to turn over. After the engine starts, the starting circuit is de-energized whenthe START/RUN/STOP switch is set to RUN position. The generator set engine is stopped by positioningthe START/RUN/STOP switch to STOP.b. The batteries are charged by the alternator that is belt driven by the engine. Generator set control systempower is also supplied by the alternator. The battery charging ammeter is a dial indicator type gauge whichmeasures DC current flow to and from the battery. It is calibrated in 1 ampere increments from -10 to +20.Normal indication of the meter is dependent upon the state of the battery. A low charge such as existsimmediately after engine starting, will result in high reading. When enough charge has been restored tothe battery the indicator should move near 0.Figure 1-6. Engine Starting System1-16
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