ARMY TM 9-6115-604-12
NAVY NAVFAC P-8-633-12
Figure 4-25. Acoustical Panel Repair (Sheet 2 of 2)
SECTION VIII . MAINTENANCE OF DC ELECTRICAL AND CONTROL SYSTEM
GENERAL. The DC electrical and control system starts, stops, and monitors the diesel engine which drives the
generator. The relays, solenoids, motors, indicators, and other components which form the DC electrical and control
system are located at various points throughout the generator set. This paragraph describes in detail how the generator
set is started, protected, and stopped. Throughout the following discussion, it is assumed that OPERATION
SELECTOR SWITCH S3 is set to MANUAL, unless stated otherwise. Refer, as necessary, to the generator set DC
Arming Engine Starting Circuit. The engine starting circuit is armed when MAINTENANCE LOCKOUT
switch S100 is set to OPERATE. This applies battery positive to MASTER SWITCH S9 through 24 V DC CONTROL
POWER CIRCUIT BREAKER CB1 and LOCAL REMOTE SW S2.
24 V DC CONTROL POWER CIRCUIT BREAKER CB1 is normally set to ON. CB1 is a 20 ampere
dc circuit breaker which serves to protect the generator set dc control system from overload. The circuit breaker is panel
mounted on cabinet C door.
MAINTENANCE LOCKOUT switch S100 is used to disarm the start circuit during generator set
maintenance. Battery charger BC1, emergency lights DS20 through DS23, and the trip coil of load circuit breaker
CB101 are the only elements capable of operating with power from batteries BT1 through BT4 when MAINTENANCE
LOCKOUT switch S100 is15 set to MAINTENANCE. EMERGENCY LIGHTING CB CB2 operates the emergency lights.
S100 and CB2 are both mounted on cabinet C door.