ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-445-2
NAVY NAVFAC P-8-624-34
(2) Test.
(a) Start and operate the generator set and allow the set to stabilize at rated load, rated voltage and
rated frequency. During this period record all instrument readings including thermal instrumentation
at minimum intervals of 10 minutes. If necessary, adjustments to the load, voltage and frequency
may be made to maintain rated load at rated voltage and frequency. Adjustments to the voltage and
frequency may be made to maintain rated load at rated voltage and frequency. Adjustments to the
voltage and frequency shall be limited to those adjustments available to the operator, specifically
adjustments to the voltage or frequency adjust devices. On sets utilizing a droop type speed control
system as the prime speed control, the speed and droop portions of the control may be adjusted.
No other adjustments to the voltage and frequency control systems shall be made. Adjustments to
load, voltage or frequency controls shall be recorded on the data sheet at the time of adjustment.
Stabilization shall be considered to have occurred when four consecutive voltage and current
readings of the generator (or exciter) field either remain unchanged or have only minor variations
about an equilibrium condition with no evident continued increase or decrease in value after the
last adjustment to the load, voltage, or frequency has been made.
(b) No further adjustments shall be made to any set control for the remainder of this test except the
control panel voltage adjust device.
(c) Record all instrument readings.
(d) Remove load.
(e) Record all instrument readings (after transients have subsided).
(f) Adjust the terminal voltage to the maximum specified value.
(g) Record all instrument readings.
NOTE
At voltages above rated values, the generator will be supplying less than rated current,
and at voltages below rated values, the generator will be supplying greater than rated
current. Caution should be taken to avoid damage to instrumentation and load banks.
(h) Apply rated load (rated kw at rated power factor).
(i) Record all instrument readings (after transients have subsided).
(j) Remove load and adjust voltage to the maximum attainable value or to a value just prior to
actuation of the overvoltage protection device.
NOTE
The output voltage may exceed the rating of connected equipment.
(k) Record all instrument readings (after transients have subsided).
(l) Apply rated load.
(m) Record all instrument readings (after transients have subsided).
(n) Adjust voltage to the minimum specified value at rated load.
(o) Record all instrument readings (after transients have subsided).
(p) Remove load.
(q) Record all instrument readings (after transients have subsided).
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