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Figure 3-86. Governor Control Unit Removal and Installation
ACTUATOR  UNIT.

TM-9-6115-464-34 Generator Set Diesel Engine Driven Tactical Skid Mtd 15 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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ARMY   TM   9-6115-464-34 AIR   FORCE   35C2-3-445-2 NAVY  NAVFAC  P-8-624-34 Table 3-7. Electric Governor Malfunction Testing PROBABLE CAUSE OF TERMINAL NORMAL NON-NORMAL  READING CORRECTIVE ACTION S 1.0 volt AC-RMS 1.  Defective  magnetic  pickup. minimum while cranking. 2. Gap too large between magnetic pickup and gear teeth. 3. Improper or defective wiring to the magnetic pickup. 1.  Replace  magnetic  pickup. 2. Readjust magnetic pickup. 3. Replace wiring harness. K 10.1±.20 volts DC while 1. DC power not connected or energized (Internal low battery voltage. regulated D.C. supply). 2. Frequency trim potentiometer shorted, grounded or miswired. 3. Wiring error. 4. Defective control unit. L Above 5.1 volts DC while 1. Frequency adjust set too low. running. (inverse speed error signal). 2. Defective control unit. Above 5.1 volts is under speed signal. Below 5.1 volts is over speed signal. On speed will indicate a steady 5.1 volts. N 8.5 to 9.5 volts DC while 1. Battery voltage maybe too cranking. (Proportional low  while  cranking. actuator voltage). 2. Defective control unit. R 2.5 volts DC maximum 1. Output transistor open (defec– while  cranking.  (Tran- tive control unit). sister voltage). 2.  Defective  actuator. 3. Error in wiring to actuator. (13) (14) 1.  Connect  DC  power  supply; replace  DC  battery. 2. Replace control unit. 3.  Replace  wiring  harness. 4. Replace control unit. 1. Turn frequency adjust screw  clockwise. 2. Replace control unit. 1.  Charge  DC  battery;  replace DC battery. 2. Replace control unit. 1. Replace control unit. 2. Replace actuator. 3.  Replace  wiring  harness. NOTE Two people will be required to adjust the control unit. Ensure that the actuator linkage rod and all levers are securely fastened and move freely (without binding) before operating the engine. Manually overcome the actuator until adjustment of the control unit is completed and the governor is in control. Adjustment of the control unit will be made with the engine operating in a no–load condition. Start the engine, manually operating the fuel shutoff lever. Turn the control unit frequency adjust screw clockwise until the proper engine speed is obtained. Several turns may be required. The generator set frequency adjust pot should now have sufficient adjustment travel to cause the generator set frequency meter to indicate beyond both of its extreme limits (388-412 Hz). 3-190







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