Figure 10-1. Annunciator Alarm System, Simplified Schematic Diagram

CHAPTER 10 MAINTENANCE OF CONTROLS, INSTRUMENTS, AND SWITCHGEAR

TM-9-6115-604-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 Kw. 1 Phase-2 Wire 1 Phase -3 Wire 3 Phase -4 Wire 120. 120/240 and 120/208 Volts Manual
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TM 9-6115-604-34 NAVFAC P-8-633-34 Figure 10-1. Annunciator Alarm System, Simplified Schematic Diagram (2) Pressing pushbutton S15 also connects battery positive to all annunciator panel A9 lights, while disconnecting alarm relay K26. Disconnecting relay K26 prevents activation of the flasher, which is described in step c, above. All annunciator panel A9 lights will remain constantly lit as long as pushbutton Si5 is depressed. (3) Releasing pushbutton SI5 disconnects battery positive from the horn and the lights and reconnects alarm relay K26. The horn goes dead, the lights go out, and the alarm system is prepared for normal operation. h. Engine Shutdown and Load Circuit Breaker CB101 Trip Circuits. Several of the alarm system self-latching relays have additional contact sets in the engine shutdown circuit or the load circuit breaker CB1 01 trip circuit. These contact sets function as follows: (1) Tripping undervoltage, reverse power, or underfrequency alarm relays Al OK8, Al1 K1, or Al1 K5, respectively, will energize circuit breaker trip relay K30. Relay K30 energizes the trip coil in bad circuit breaker CB1 01, opening the breaker to disconnect generator G1 from the bus. The engine will continue to run, but load circuit breaker CB101 will be uncloseable until the annunciator alarm system is reset via ANNUNCIATOR RESET pushbutton S12. (2) Tripping overvoltage alarm relay Al 0K7 will energize engine shutdown relays K20A and K20B. Relay K20A deenergizes self-latching engine run relay K1 5B. As a result, engine fuel solenoid L1 loses power, doses, and cuts off fuel to the engine; the engine shuts down. Relay K20B energizes circuit breaker trip relay K30. Relay K30 energizes the trip coil in load circuit breaker CB1 01, opening the breaker to disconnect generator G1 from the bus. The generator set cannot be restarted until the annunciator alarm system is reset via ANNUNCIATOR RESET pushbutton Si2 on the upper door of cabinet A. i. High and Low Level Fuel Circuits. Two of the alarm system self latching relays have additional contact sets in the high and low fuel level circuits. These contact sets function as follows: 10-2

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