Section III. OPERATIONAL TESTS
The tests described in this section require generator set operation and provide verification of generator set
All tests shall be conducted with the 240/416 volt connections, unless otherwise specified.
Unless otherwise specified, all test instrumentation will be in accordance with Military Standardization Handbook
MIL-HDBK-705 and Military Standard MIL-STD-705B.
Temperatures will be measured by means of approximately located thermocouples and properly calibrated read-
out devices. Thermocouples will be insulated from contact with other metals, as practical. Temperatures will be
recorded in degrees Fahrenheit or Centigrade, depending on the instrument scale, but will be converted to
degrees Fahrenheit in all cases. Barometric pressures will be measured by a mercurial barometer which will be
corrected for the temperature of the scale, the mercury, for vapor pressure and for the location of the barometer
with regard to altitude and latitude. Aneroid barometers will not be used.
Operation procedures required in support of the individual tests specified herein shall be performed as in the
Operator/Crew and Organization Maintenance manual.
All test results, for generator set overhaul, shall be logged on the appropriate forms as required.
Perform the operating tests as indicated in table 16-1.
16-8. REVERSE POWER PROTECTIVE DEVICE TEST.
Start generator and apply 15 percent load.
Depress the red button, marked PRESS TO ADJUST AND TEST, on the control cubicle. Reverse power relay
should activate and open load connector.
16-9. LOW FUEL PROTECTIVE DEVICE.
To conduct the low fuel protective device test, load instrumentation (as described and illustrated in MIL-HDBK-
705) and a stopwatch are required.
Test the low fuel protective device as follows:
Connect the load instrumentation in accordance with the applicable figure of MIL-HDBK-705, Method
Level the generator set.
Fill the fuel tank using the fuel transfer pump.
Disconnect the auxiliary fuel lines from the fuel tank.
Start and operate the generator set at rated load, till the low fuel fault lights and alarm is energized. This
indicates that there is enough fuel in the day tank to operate at rated load and frequency for one hour.
Simultaneously start the stop watch.
Continue operating the set for approximately 50 to 60 minutes or until the low fuel protective device switch
FL4 shuts down the generator set. This indicates that there is enough fuel left to operate the set at rated
load for 15 minutes. Record the time