TM 11-6625-680-14-2
equipment on or near rear of cabinet
(4) LIVE CIRCUIT switch to OFF.
during test operation. Failure to observe
(5) Adjust LOAD CONTROL to 0 (fully
this caution can result in severe burn to
counterclockwise).
personnel or fire hazard to equipment.
( 6 ) D.C. AMMETER RANGE switch to
WARNING
START.
After the dc power source is connected to
(7) VOLTS/AMPS switch to AB/A for a 3-
the 28 vdc input terminals on the front
phase inverter and to NA/N for a 1-phase in-
panel of the test set, bind the input dc
verter.
terminals with electrical insulation tape
(8) Connect the dc input power source (set
(NSN 5970-00-296-1625), leaving no bare
for 28 volts and capable of providing 160 amperes)
metal of the binding posts or conductor
to D.C. and +28V. terminal posts. (Do not
exposed. Failure to observe this warning
turn on dc input power at this time.)
can result in severe burns to personnel.
WARNING
C. Procedure. The procedure for a functional
Do not touch rear of Test Set, Motor-
test is given below using a PU-545( )/A inverter
Generator AN/GSM-65A cabinet during
as an example.
test operation. Do not place any
Control settings
Step
Equipment
Test
No.
equipment
Test procedure
Performance standard
under test
1
a. T e s t S e t ,
a. Turn D. C. POWER switch to ON.
PU-545( )/A
a. I n v e r t e r s h o u l d s t a r t . A . C .
Motor-
inverter.
VOLTS meter should read ap-
proximately 115 volts. FRE-
Generator
QUENCY meter should read
AN/GSM-
65A.
approximately 400 Hz.
b. None.
b. S e t t h e
LOAD switch
to 3 phase.
c. Set LOAD CONTROL for 12.5 amperes on the
c. None.
c. S e t t h e
A. C. AMPS meter.
VOLTS/
AMPS
switch to
AB/A.
d. F R E Q U E N C Y m e t e r r e a d s b e -
tween 390 to 410 Hz.
e. Observe D. C. AMPS meter.
e. D. C. AMPS meter reads less than
165 amperes.
f. Observe A. C. VOLTS meter.
f. A. C. VOLTS meter reads between
112.5 and 117.5 volts.
g. Set VOLTS/AMPS switch to BC/B.
g. F R E Q U E N C Y m e t e r , D . C .
A M P S meter and VOLTS meter
readings should be the same as in
d, e, and f above.
h. Set VOLTS/AMPS switch to CA/C.
h. F R E Q U E N C Y m e t e r , D . C .
A M P S meter, and VOLTS meter
readings should be the same as in
d, e, and f above.
d. Stopping Procedure. After performing the
(3) Set the D.C. POWER switch to OFF.
test, perform the following procedures.
(4) Turn the dc power supply off.
(1) Slowly turn the LOAD CONTROL to 0.
(5) Disconnect the cable at Test Set, Motor-
(2) Set the LOAD switch to OFF.
Generator AN/GSM-65A and the inverter.
6-2
