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

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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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