1-9 TM 5-6115-584-12 NAVFAC P-8-622-12 TO-35C2-3-456-1 TM-05682C-12 Section II. DESCRIPTION AND DATA DESCRIPTION OF GENERATOR SET. This  unit  is  a  5  kilowatt,  60  Hertz  Generator  Set.  It  consists of a revolving field alternator powered by an air cooled diesel engine. See  figures  1-1  and  1-2  for  the  location  of  major components   and   figure   1-2.1   for   generator   with   acoustic suppression kit (ASK) installed. a.  Engine. (1) The engine  powering  this Generator Set is a 2 cylinder, 4 cycle air cooled engine, with a 70 cubic tncb (cu. in) displacement.  A mechanical governor keeps engine  speed at 1800 revolutions per minute (RPM) under rated load conditions. (2) Fuel is supplied either from this unit's self- contained fuel tank or, by using an adapter, directly from a 55 gallon drum or other source. The fuel is filtered by two cartridge type fuel filters and a single fuel strainer. Two electric,  self-priming fuel pumps pump fuel to the fuel injection pump which delivers the fuel at high pressure to fuel injection nozzles in the cylinder head. When  auxiliary source of  fuel is used, three electric fuel pumps are Used. (3)  Two  12  volt  “wet  cell”  battertes  in  series supply power for a 24 volt electric starter and for glow plugs, located in the cylinder head, and two air heaters located in the intake manifold, used for cold weather  starting.  An  alternator  located  beneatb  the blower  wheel and completely separate from the main alternator  automatically  recharges  these  batteries when the engine is operating. b. Generator. The generator on this set is a four pole, revolving field type. Alternating current, supplied by the exciter assembly, is recitified and used to create the four pole, revolving field. A “solid-state” voltage regula- tor assembly automatically adjusts this current to ob- tain a constant (±3%) voltage in the main stator (out- put) windings. c. Controls. All operator controls and indicator gauges necessary for running the engine Generator Set are located on the control panel. On ASK equipped generators, an oil pressure gauge is located on the engine under air intake door and a fuel level gauge is located on the fuel tank. The speed control is located behind a small flap on the rear panel assembly below the control panel. Controls for selecting output voltage are located on the output control box d. Generator Set Electrical System (see schematic figure  1-7). (1)  General.  The  generator  set's  electrical  sys tem consists of two distinct systems (1) the dc system used  primarily  for  operating  control  and    excitation and (2) the ac output system to supply power to the The dc source consists of a 24 volt battery set (BT1 and BT2) that is kept charged by a battery charging alternator  (G2)  and  voltage  regulator  rectifier  as- sembly (A5). Fuse (F1) protects the alternator from overload  Circuit  breaker  (CB2)  protects  the  battery charging  system  from  overload.  Slave  receptacle  (J15) permits an alternate external supply to be connected to the battery circuit. (2)  Operation.  Placing  MASTER  SWITCH  (S1) into the PREHEAT position, the preheat relay R2 is activated to energize the heater elements (ER1 and ER2) and the engine glow plugs (HR3 and HR4). Placing the MASTER SWITCH in the PRIME-RUN- AUXILIARY  position  activates  the  fuel  pumps  E2  and E3 as well as the auxiliary fuel pump E1. If the fuel level is down, the fuel level switch S3 will be closed and the auxiliary fuel solenoid will actuate permit- ting fuel to be pumped into the tank. Placing the MASTER SWITCH (S1) into the PRIME- RUN position maintains power to the main fuel pumps but  deactivates  the  auxiliary  fuel  pump. (a) Start.  Placing the MASTER SWITCH (S1) into the start position maintains the fuel pump cir- cuits and the preheat circuits to the glow plugs (HR3 and HR4) as well as to energize the governor sole- noid  K5)  and  start  relay  (K1).  The  crank  relay (K3) is eneregized, in turn energizing the start sole- noid (K6) and activating the starter (B1). The gov- ernor brings the engine to  speed, building up oil pressure and closing oil pressure switch (S5). The exciter field is flashed during this  starting procedure. (b) Run. Placing the MASTER SWITCH (S1) in the  PRIME-RUN  position  keeps  the  governor  solenoid (K5) energized thru the now closed oil pressure switch (S5)and fuel will be supplied to the engine as long as the oil pressure is normal and the align temperature switch (S4) is not activated by high temperature. (c) Stop. Placing the MASTER SWITCH (S1) in the  OFF  position  de-energizes  the  governor  solenoid (K5) shutttng off fuel to stop the engine. High temper- ature or low oil pressure will also shut the engine down. (3) AC Circuitry. The main alternator (G1) is wound with six pairs of coils that may be connected by the AC Reconnect switch (S6) into various com- binations, the output of which is available at the load terminal board (TB1). Circuit breaker (CB1) protects the  alternator  from  overloads.  The  volt/ampere  se lect switch (S8) permits switching voltmeter (M5) and ammeter (M4) to read the load current and voltage for the various arrangement of outputs. Voltage  regulator  (A2)  and  current  voltage  trans- former CVT1 monitors the alternator output voltage Change 7  1-2.1/(1-2.2 blank)