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Procedure
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TM-11-6125-259-30 Inverter Power Static PP-7274C/A Manual
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Table-3-2. Troubleshooting Data
TM 11-6125-259-30
ar. Set UNIT PWR switch S6 to ON position and
between 393 and 407 Hz.
al. Set 200% RATED LOAD CURRENT switch
apply 26 vdc input from the input power supply.
S1 to the down (off) position.
as. Set the OUTPUT MONITOR swith S16 to A
position and SHORT swith S10 to the up(on)
am. set PHASE CURRENT switch S11 and
OUTPUT MONITOR switch S16 to C position.
position.
at. Before A output currant foldback (digital
an. Bfore C output foldback (digital
voltmeter No. 3 reads 100 mV or less), read the
voltmeter No. 3 reads 100 mV or less), measure the
output current equivalent millivolts (100 mV = 1
following C parameters. (The output current
amp) as indicated on digital voltmeter No. 3. The
foldback occurs in 5 to 15 seconds after switch S1 is
output current shall be 5.43 amps or greater.
set to 200% RATED LOAD position. If necessary,
reset output overload condition to enable
au. set the OUTPUT MONITOR switch S16 to B
Position, SHORT switch S10 to the down (off)
measurement of listed parameters.)
position and S20 to the up (on) position.
(1) Read Output voltage as indicated on digital
av. Before B output current foldback (digital
voltmeter No. 4 The output voltage shall be 50
voltmeter No. 3 reads 100 mV or less), read the
vrms or less.
output current equivalent millivolts , (100 mV = 1
(2) Read the output current equivalent
millivolts (100 mV = 1 amp) as indicated on digital
amp) as indicated on digital voltmeter No. 3. The
output current shall be 5.43 amps or greater.
voltmeter No. 3. The output current shall be 4.34
amps or greater.
aw. Set the OUTPUT MONITOR switch S16 to C
position, SHORT switch S20 to the down (off)
(3) Read the output frequency as indicated on
electronic counter. The output frequecy shall be
position and S30 to the up(on) position.
between 393 and 407 Hz.
ax. Before C output current foldback (digital
ao. Set 200% RATED LOAD CURRENT switch
voltmeter No. 3 ready 100 mV or less), read the
S1 to the down (off) position and set UNIT PWR
output current equivalent millivolts (100 mV = 1
switch S6 to OFF position.
amp) as indicated on digital voltmeter No. 3 The
ap. Set switches S2, 3, 4, 12, 14, 22, 23 and 24 to
output current shall be 5.43 amp or greater.
the down (off) position.
ay. Set UNIT PWR switch S6 to OFF position,
aq. Set switches S7, 8, 9, 17, 18, 19, 27, 28 and 29
deenergize input power supply and remove unit
to the up (on) position (250 VA, 0.75 P.F. Load).
from test setup.
Section II. TOOLS AND EQUIPMENT
3-7. Tools and Equipment
b. DC Power supply, any commercial type
providing 0 to 40 vdc, 50 amps maximum.
The following instruments or equivalent are
c. Oscilloscope AN/USM-281
required to perform the inverter operational
d. Digital Voltmeter AN/GSM-64
checkout:
e. Electronic Counter AN/USM-207
a. Dc power supply, any commercial type
f. Distortion Analyzer TS-723/A
providing 0 to 45 vdc, 6 amps maximum.
g. EM1289A Test Fixture, Gulton No. 421773
.
Section Ill. TROUBLESHOOTING
3-8. Troubleshooting
component part. Note that initial digit of the part
number is also the module number. For example,
Use table 3-2 to troubleshoot the inverter to the
transistor Q206 is a component of the A2 module.
module level or to the component part level. Then
Refer to paragraphs 3-9 and 3-10 for information
replace either entire defective module or defective
on complete disassembly/assembly of inverter.
3-18

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