ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
Section Il. OPERATING TESTS
a. The tests described in this section require generator set operation and provide verification of generator
set performance characteristics.
All tests shall be conducted with the 240/416 volt connections, unless otherwise
specified. All tests that are applicable, will be conducted on both Mode I and Mode II
generator sets. Mode I tests shall be conducted at 60 Hz only unless otherwise
b. Unless otherwise specified, all test instrumentation will be in accordance with Military Standardization
Handbook MIL-HDBK-705 and Military Standard MIL-STD-705.
c. Temperatures will be measured by means of appropriately 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.
d. Operation procedures required in support of the individual tests specified herein shall be performed as in
the Operator and Unit Maintenance Manual.
e. All test results for generator set overhaul, shall be logged on the appropriate forms as required.
f. Perform the operating tests as indicated in table 4-1.
4-7. DIRECTION OF ROTATION CONTROLS.
With the generator set running at a rated load, rotate the following controls and verify their proper operation.
a. Frequency Adjust Control. On Class 1 sets clockwise rotation of the frequency adjust control rheostat
must cause set frequency to increase as indicated on the frequency meter. On Class 2 sets counterclockwise
rotation of manual speed control must increase frequency.
b. Voltage Adjust Control. Clockwise rotation of the voltage adjust control must cause set voltage to increase
as indicated on the voltmeter.
c. Governor Paralleling Control (Class 1 Sets Only). Counterclockwise rotation of the governor paralleling
control must cause an increase in the signal appearing at the paralleling receptacles.
d. Voltage Regulator Paralleling Control. Clockwise rotation of the voltage regulator paralleling control must
cause that set to increase its share of the total reactive Kva.
4-8. REVERSE POWER PROTECTIVE DEVICE TEST
a. Operate two generator sets in parallel at no load, with contractors closed.
b. Lower speed of set being tested until the main contactor opens.
c. Record the value on the kilowatt meter of the other set at the moment the contactor opens. The load
contactor of the set under test must open when power flow into the generator exceeds 20 percent of the rated