ARMY TM 9-6115-464-12
AIR FORCE TO 35C2-3-445-1
NAVY NAVFAC P-8-624-12
Section Ill. PRINCIPLES OF OPERATION
1-13 lNTRODUC TION. This section contains functional descriptions of the 15 kw generator set and explains how
the controls and indicators interact with the system.
1-14 ENGINE STARTING SYSTEM.
The engine starting system (Figure 1-6) consists of two 12-volt batteries, a starting motor and a 24-volt
battery 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 engine
flywheel causing the engine to turn over. After the engine starts, the starting circuit is de-energized when
the START/RUN/STOP switch is set to RUN position. The generator set engine is stopped by positioning
the START/RUN/STOP switch to STOP.
b. The batteries are charged by the alternator that is belt driven by the engine. Generator set control system
power is also supplied by the alternator. The battery charging ammeter is a dial indicator type gauge which
measures 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 exists
immediately after engine starting, will result in high reading. When enough charge has been restored to
the battery the indicator should move near 0.
Figure 1-6. Engine Starting System