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TM 9-2920-257-30&P
APPENDIX E
TEST STAND PROCEDURES
GENERAL
E-1.
After repair of the generator it must be bench tested to verify
Follow the procedures below to calibrate test
correct
operation.
s t a n d t a c h o m e t e r , s e t base settings for the test stands, and then
perform tests on the 200 ampere generator/regulator and generator.
E-2.
Military vehicle generators are equipped with various size pulleys,
such as 3-, 3 1/2-, and 4-inch diameter.
T h e 500-ampere test stand
has a 4-inch pulley.
S i n c e the test stand tachometer reads drive head
s p e e d , the tachometer must be calibrated when a generator has a pulley
larger or smaller than 4 inches.
T o calibrate the speed of the
generator use fomula below.
F o r m u l a : a = Test speed of test generator (normally lowest rated
output speed as indicated by specifications).
4 = Diameter of drive pulley on test stand.
b = Value of a x 4.
c = Diameter of pulley on generator to be tested.
e = Value of b divided by c (this value will indicate the
speed of the driven pulley when the test stand speed (a) is at
selected speed).
aX4=
b
=e
c
Example:
To test a generator with a 3-inch pulley, determine lowest
rated speed of generator.
I f rated RPM for a generator is 2,000 RPM
t o 8,000 RPM, select 2,000 RPM as test speed.
Increase test stand speed to 2,000 RPM with vari-drive speed control.
Turn the calibrate pulley control to calibrate position.
E-1
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