ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-12Figure 4-25. Acoustical Panel Repair (Sheet 2 of 2)SECTION VIII . MAINTENANCE OF DC ELECTRICAL AND CONTROL SYSTEM4-19.GENERAL. The DC electrical and control system starts, stops, and monitors the diesel engine which drives thegenerator. The relays, solenoids, motors, indicators, and other components which form the DC electrical and controlsystem are located at various points throughout the generator set. This paragraph describes in detail how the generatorset is started, protected, and stopped. Throughout the following discussion, it is assumed that OPERATIONSELECTOR SWITCH S3 is set to MANUAL, unless stated otherwise. Refer, as necessary, to the generator set DCschematic, FO-1.a.ArmingEngineStartingCircuit. The engine starting circuit is armed when MAINTENANCE LOCKOUTswitch S100 is set to OPERATE. This applies battery positive to MASTER SWITCH S9 through 24 V DC CONTROLPOWER CIRCUIT BREAKER CB1 and LOCAL REMOTE SW S2.(1)24 V DC CONTROL POWER CIRCUIT BREAKER CB1 is normally set to ON. CB1 is a 20 amperedc circuit breaker which serves to protect the generator set dc control system from overload. The circuit breaker is panelmounted on cabinet C door.(2)MAINTENANCE LOCKOUT switch S100 is used to disarm the start circuit during generator setmaintenance. Battery charger BC1, emergency lights DS20 through DS23, and the trip coil of load circuit breakerCB101 are the only elements capable of operating with power from batteries BT1 through BT4 when MAINTENANCELOCKOUT switch S100 is15 set to MAINTENANCE. EMERGENCY LIGHTING CB CB2 operates the emergency lights.S100 and CB2 are both mounted on cabinet C door.4-65
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