ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-445-2
NAVY NAVFAC P-8-624-34
4-9. LOW FUEL PROTECTIVE DEVICE.
a. Disconnect cable to the day tank fuel solenoid valve.
b. Operate generator set at full load.
c. The low fuel protective device must operate when the fuel in the day tank falls to a point at which there is
only enough to operate the set at rated load for one minute.
4-10. PARALLEL OPERATION PROVISIONS.
a. For Class 1 (Precise) Sets (REAL POWER):
(1) Remove the shorting plug.
(2) With rated (15 kw) load on the generator set, measure the dc voltage across pins A and 8 of one of
the paralleling receptacles (J45, J46 or J47). Adjust R28 (located in the precise relay box) until
correct *VDC is indicated. Ensure that correct pin * is positive.
b. For Class 1 (Precise) Sets (Reactive Power):
(1) Remove shorting plug.
(2) With rated (15 kW) load applied at .8 PF, and the operation switch in the parallel position, measure
the ac voltage across pins C and D of one of the paralleling receptacles (J45, J46, or J47). Adjust
R29 (located on the special relay box) until 6 volts ac is achieved.
c. For Class 2 (Utility) Sets (Real Power), adjust governor droop as follows:
(1) Start and run engine until it reaches operating temperature.
(2) With rated (15 kW) load applied and the engine operating at rated speed, droop may be determined
by removing load and noting no-load frequency.
(3) Adjust the knurled knob, located at the rear of the fuel pump, until the difference in frequency
between no-load and full load is 3 percent. Note the increase of hertz when load is removed. At 60
Hz, droop should be 1.8 Hz, and at 400 Hz, droop should be 12.0 Hz.
d. For Class 2 (Utility) Sets (Reactive Power):
(1) Start and run engine until it reaches operating temperature.
(2) Install shorting plug
(3) With rated (15 kW) load applied at .8 PF and the generator operating at rated voltage; voltage droop
may be determined by removing the load and noting the difference between full-load and no-load
voltage.
(4) Adjust R29 (located on the special relay box) until the difference in voltage between no-load and full
load is 3 percent. Note the increase of volts when load is removed. At 120 volts, droop should be 3.6
volts.
4-3
