ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
c. Generator With Separate Excitation.
(1) Preparation for test.
(a) Completely isolate the generator windings (armature coils and field windings).
(b) Connect the frequency meter to one of the armature coils of the generator.
(c) Provide separate excitation for the exciter field.
(2) Test.
(a) Start and operate the generatorat rated frequency and at no load.
(b) Adjust the excitation so that anyone of the coil voltages is at rated value.
(c) Read and record the generator frequency (speed) and the voltage of each armature coil.
d. Generator With Separate Excitation:
(1) Determine from the data obtained in 4-13d. (2) the maximum and minimum armature coil voltages.
(2) The voltage unbalance is the difference between the maximum and minimum armature coil voltages.
To express this in percent divide this difference by rated armature coil voltage and multiply by 100.
Voltage Unbalance (Coil), in percent=
V max–V min
X 100
V Rated
(3) Compare the results of step (2) above with the requirements.
4-13. REGULATOR RANGE TEST
a. General. The voltage adjust device associated with the voltage regulator provided with the generator set
must have adjustment capable of varying the regulated voltage throughout the limits and under the various load
conditions and temperature ranges without causing the voltage droop of the set to exceed specification limits.
The voltage adjust device also must be capable in some cases of providing an operating voltage other than
rated voltage for special types of equipment and to compensate for external line drop.
b. Apparatus. Instrumentation for measuring load conditions, ambient temperature, and the generator field
(or exciter field) voltage and current shall be as described and illustrated in MIL-HDBK-705.
(1) Preparation for test.
(a) Connect the load and field instrumentation in accordance with the applicable figure of
MIL-HDBK-705, Method 205.1, Paragraph 205.1.10 for one voltage and frequency.
c. Procedure for Test.
4-8
