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Page Title:
BASE SETTING FOR UMC SWITCHES AND CONTROLS |
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 TM 9-2920-257-30&P
Turn the calibrate knob to increase reading on the tachometer to value
determined by e (speed of test generator) in above formula.
Increase
or reduce test stand speed with vari-drive control until tachometer
I n the formula below, the
indicates desired test speed (2,000 RPM).
3 - i n c h pulley on the test generator will be turning 2,666 RPM when the
t e s t stand tachometer indicates 2,000 RPM.
2000 X 4 = 8000 = 2666 RPM
3
BASE SETTING FOR UMC SWITCHES AND CONTROLS
E-3.
(Part NO 7458 and 7458-2)
CAUTION
M a k e certain all test stand switches and controls are in
p o s i t i o n s listed below before testing to prevent damage to
test stand or component by application of excessive power.
T h e base setting for UMC controls and switches:
a . DC load ammeter range switch
X 10
b . DC field ammeter range switch
X6.
c.
Millivoltmeter
X 10
( 1 ) Range switch
(2) Millivoltmeter (press to read switch)
OFF
d . DC voltmeter
X5
( 1 ) Range switch
(2) Select switch
RECT/GEN
e . Tachometer
DIRECT DRIVE
(1) Select switch
COUNTERCLOCKWISE
(2) Pulley calibration knob
f. AC ammeter
( 1 ) Range switch
X2
T1
( 2 ) Select. switch
g . AC voltmeter
X2
( 1 ) Range switch
T1 - T2
(2) Select switch
h. External field exciter switch (AC system)
OFF
E-2
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