ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-445-2
NAVY NAVFAC P-8-624-34
(1) Preparation for test.
Connect the load and field instrumentation in accordance with the applicable figure of
MIL-HDBK-705, Method 205.1, paragraphs 205.1.10, for one voltage and frequency. Connect the
signal input of the recording meter(s) to the convenience receptacle of the set or to the generator
coil which is used as the voltage sensing input to the voltage regulator. (Power the recording
meter(s) from the commercial utility.)
Set the recording meter chart speed(s) to a minimum of 5 inches per hour. The following items shall
be recorded on both the data sheets and recording chart(s):
1. The date
2. The serial number(s) of the recording meter(s)
3. Generator set identification
4. The recording chart speed(s)
5. The data reading number
(c) Place all instrumentation referred to in paragraph 4-15b. in operation.
(a) Start and operate the generator set and allow the set to stabilize at rated load, rated voltage and
rated frequency. During this period operate the recording meter(s) at a chart speed of not less than
6 inches per hour, and 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
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 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 both the
data sheet and the recording chart(s) at the time of an adjustment. Stabilization shall be considered
to have occurred when four consecutive voltage and current recorded 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) After stabilization has occurred, drop the load to no load and reapply rated load a number of times
(three should be sufficient) to assure that the no load and rated load voltage and frequency values
are repeatable and that the frequency and voltage regulation is within the limits specified in the
procurement document. If any adjustments are necessary, paragraph (a) above must be repeated.
Reapply rated load.