TM 9--2350--292--100005 00--11THEORY OF OPERATION -- CONTINUED0005 00AUXILIARY POWER UNIT (HATZ)DVoltage Regulator (1) -- voltage regulator receives 28 V dc from the starter/generator (3) and provides28+0.7 V dc to charge the vehicle batteries. Voltage regulator (1) is equipped with a resettable circuitbreaker. If the circuit breaker opens due to an over voltage condition, the reset button (5) can be pushedto reset the circuit breaker.DEngine (2) -- burns fuel drawn from the right rear fuel tank. Engine drives starter/generator (3) and auxilia-ry hydraulic pump (4).DStarter/Generator(3) -- connected to the APU engine (2) by a chain. Chain driven by the APU engine (2),the 300--amp 28--volt generator functions as the starter motor. Power from the batteries is used to powerthe starter/generator when starting the APU. Once the APU is started, the starter/generator generates 28V dc and delivers it to the voltage regulator (1) to charge vehicle batteries and supply electrical power tothe vehicle.DAuxiliaryHydraulicPump (4) -- supplies hydraulic pressure to run the impact wrench and refuel/defuelpump under normal operations, or raise/lower the spade or boom, and retrieve cables under no load con-ditions under emergency operations.12345
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