4-63. GENERAL. (cont) c. Elec trical Function. (cont) the EECM logic that an engine startup is  beginning,   and it begins to monitor the status of the engine. Power is also  provided  to  the  electric fuel transfer  pump. The pump operates to pressurize  the  fuel  system. (2)  Enqine  Startup. When   the MASTER SWITCH is momentarily placed in the START position and then released, a start signal is sent to the EECM. The EECM  then  checks  the  status  of  the monopole  speed  sensor. If  the  EECM senses a reading of other than zero, it will not continue the start sequence. If  it  senses  a  reading  of  zero,  it shows that the engine is not running and the EECM will provide a signal to start the high pressure fuel pump. It also sends signals to the Igniter, fuel shutoff/drain  solenoid  valve,  and  the starter.  The  starter  turns  and  cranks the  engine. As the engine starts, the EECM monitors engine speed through the monopole speed sensor, and exhaust gas temperature through  the  EGT  thermo- couple. If engine speed does not reach 10  percent  of  full speed  within  5 seconds, the  EECM  will  disable  the igniter,  high  pressure  fuel  pump,  and starter, stopping the engine. If engine speed is correct, the engine is allowed to continue building speed. If exhaust temperature does not rise after the  start  signal  is  sent,  the  EECM senses that ignition did not take place and will stop the engine. If  exhaust temperature does rise, the engine is allowed to continue building speed. The EECM continues to monitor engine speed through  the  monopole speed sensor. Engine  speed  is compared  to  speed values stored in the EECM. If there is a  difference  between  engine  speed  and the stored value, the EECM will signal the fuel system to increase or decrease ARMY TM  5-6115-612-12 MARINE  CORPS  TM  6115-12/7 AIR  FORCE TO 35C2-3-471-1 NAVY AG-320B0-0MM-000 fuel flow. This allows the engine to build speed at the proper rate. When the engine reaches 60 percent of maxi- mum speed, the EECM will disable the start sequence and allow the engine to build speed by itself. (3) Contactor Enablinq. When the engine reaches maximum speed, the EECM will  turn  on  the  CONTACTOR  READY  TO LOAD lamp and start the HOURMETER. This tells  the  operator  that  the  generator has developed rated load and is ready to supply electrical power. When the CONTACTOR switch is momentarily placed in the CLOSED position, the EECM senses the  signal and  generates an enable signal through the control panel to the contactor relay. This closes the con- tactor relay and  allows electrical power   to   pass from  the  generator, through the power cable, to the air- craft. It also turns on the CONTACTOR CLOSED  lamp  on  the  control  panel  to show the operator that the circuit is complete between the generator set and the aircraft. (4)  Output Power Adjustment. Output power can be adjusted by using the VOLTAGE ADJUST knob on the control panel. The knob controls a potenti- ometer that will send signals from the control panel to the generator elec- tronic control module (GECM). The GECM will signal the  generator  to  adjust output to the load. (5) Batt ery  Charqinq  Ammeter.  The battery  is continually  being  charged when the    engine    is running. The charging rate is shown on the BATTERY CHARGING ammeter on the control panel. The signal displayed on the ammeter is brought to the control panel by a line from a shunt located in the inlet air housing. 4-121