TM 9--2350--292--20--1MASTER RELAY AND SLAVE RECEPTACLE OVERVIEW AND DIAGRAMS.0125 00THIS WORK PACKAGE COVERS:Master Relay And Slave Receptacle Overview and DiagramsThe master relay and slave receptacle system consists of the positive bus, negative bus, batteries, shunts, themaster relay, a MASTER switch, a MASTER relay indicator light, a 30--amp circuit breaker, and related electricalwiring. The master relay and slave receptacle system switches and distributes electrical power (+24 -- 28 V dc) tomost of the vehicle electrical components. The source of electrical power can be either the batteries (+24 V dc),main engine generator (+28 V dc), APU engine generator (+28 V dc), or an external source (+24 -- 28 V dc). Notall electrical components are supplied system power from the master relay. Some circuits, such as the personnelheater, operate directly from battery or generator power outputs while others in the exhaust smoke generator, mainengine monitoring system, engine accessories and warning system operate only from output power produced bythe main engine generator. The 30--amp circuit breaker provides overload protection for the master relay and per-sonnel heater circuitsWhen the MASTER switch is turned ON, battery power (+24 V dc) energizes the master relay to supply systempower to the vehicle electrical components including the main engine starting system. Additionally, the MASTERindicator lights to show that system power is available in the vehicle. After the engine is started and running, thegenerator power output (+28 V dc) is supplied as system power through the master relay and distributed throughthe vehicle. Power can also be supplied by the auxiliary power unit or from an external source. When an externalsource is used, power is supplied by way of the slave receptacle. The various vehicle power sources can also beused as an alternate power source for other vehicles. In this case, power is supplied from the slave receptacle tothe other vehicle.Since the MASTER switch controls the application of system power to most of the vehicle electrical components,turning the MASTER switch OFF will shut down vehicle system power. The MASTER switch should be set to theOFF position when starting maintenance procedures.The relationship of the master relay and slave receptacle components is shown in the following diagram.END OF TASK0125 00--1/2 blank
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