Control Description Function BATTERY Green - fully charged: Yellow - Indicates the degree of charge of the batteries. Needle INDICATOR charging: Red - Under or over in the green area indicates fully charged between 26 charging and 30 volts. Needle in yellow area indicates charging condition between 20 and 26 volts. Needle in red area indicates an under charge or an over charge condition. Panel Light Shielded, bulb type, two used Illuminates control panel. RUNNING  TIME Hourmeter; 0 to 9,999.9 hours Indicates total operating time of Generator Set. meter Frequency Meter Range 55 to 65 Hz; 0.1 Hz scale Indicates frequency of Generator output. Model  MEP-003A divisions; red mark at 60 Hz Frequency Meter Range 380 to 420 Hz; 1 Hz scale Indicates frequency of Generator output. Model  MEP-112A divisions; red mark at 400 Hz %RATED  CUR- 0 to 133 percent range; red line at Indicates percent of rated output current. RENT METER 100 percent, green line at 0 percent Voltmeter,  AC O to 300 volt scale; suppressed from Indicates Generator Set output voltage. O to 100 volts and linear from 100 to 300 volts. Red marks at 120, 208, and 240 volt points. VOLTAGE  AD- Rheostat Adjusts  Generator  Set  output  voltage.  Clockwise  to JUST RHEOSTAT increase  and  counterclockwise  to  decrease. AMMETER- Rotary  switch Used to select phase, voltage and current combination VOLTMETER for reading on ammeter and voltmeter. TRANSFER SWITCH PANEL  LIGHT Toggle  switch;  ON-OFF Controls panel lights. SWITCH MASTER  SWITCH Rotary switch, 5 positions, PRE- When  placed  in  PREHEAT  position,  electrical  power  is HEAT, OFF, PRIME & RUN applied to glow plugs and preheater on the engine to AUX. FUEL, PRIME& RUN, and aid in cold engine starting. In OFF position, alI dc cir- START cuits  are  deenergized  except  panel  lights,  and  battery charging system. This position is use to stop the unit under normal operation. The PRIME & RUN AUX. FUEL position is used when set is running and auxil- iary fuel system is being used and also to prime entire fuel system before starting if required. The PRIME& RUN position is used when set is running and auxiliary fuel system is not used and also to prime engine fuel system only before starting if required. When placed in START  position,  energizes  engine  cranking  system  for engine starting, activates glow plugs and air heaters, and  by-passes  protective  devices. DC  ONTROL 7.5  AMP  breaker Used for protecting dc circuit in case of short and also CIRCUIT for emergency stopping; pull out to activate. BREAKER TM 5-6115-585-12 NAVFAC P-8-623-12 TO-35C2-3455-1 TM-05684C/05685B-12 Table 2-1. Generator Set Controls and Instruments Change 10 2-2.1 /(2-2.2 blank)