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Page Title:
Inverter Troubleshooting Chart. |
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 TM 11-6130-377-14
Item
Symptoms
Probable trouble
Correction Action
No.
b. Perform the corrective action
CR5 thru A1CR7 and SCRs
given for item a above. If relay
A1Q3 and A1Q4.
A1K2 (fig. 6-1) contacts do not
close at turn on, refer to para-
graph 6-7a through 6-7c for
repair/replacement procedure.
2
With the inverter operating there is
a. Defective (shorted) capacitor
no output ac voltage emanating
A1C4.
tween meter A1M3-1 (fig. 6-1)
from the unit. In addition, the
to output terminals X2 and X1
input current is higher than 15
amps, which is the normal no-load
off. There should be a short to
current.
both X1 and X2 terminals with
circuit breaker A1CB2 (fig. 6-1)
turned on and the contacts of re-
lay (A1K3) (fig. 6-1) held closed
by hand. This check is to assure
there is continuity to the output
of the unit. Subsequently attach
an ac voltmeter across capacitor
A1C4 (fig. 6-1) and set the in-
strument to read 660 vac. Turn
on the inverter. If the voltage
reading approaches zero, this in-
dicates a shorted capacitor. Re-
place the defective part.
b. Open condition in AC CUR-
b. Perform the corrective action
RENT meter A1M3 or possibly
given for item 2a above. If a
a broken wire or wires between
shorted condition is not evident,
output transformer A1T1 and
check for an open condition in
the ac output terminals.
meter A1M3 (fig. 6-1) or defec-
tive wires between transformer
A1T1 (fig. 6-1) and ac output
terminals. Repair/replace defec-
tive items.
c. Defective choke (A1L3) A1L4.
c. Measure continuity between A1
C4 (fig. 6-1) pin 1 and A1TB3-
X2 (fig. 6-1). If not obtained,
replace (A1L3) A1L4.
d. Defective inverter drive circuit
board A1A2 (1973 model).
there is an A1K3 (fig. 6-1) relay
drive (common) at connector
A1A2J1, pins 5 and 6 (FO-2)
(inverter drive circuit). If this
drive is not evident, replace the
defective circuit board. Refer to
pair.
3
Non-regulated output ac voltage
Defective (open) capacitor (A1C4)
Disconnect one wire from each
emanating from the unit with the
A1C3.
capacitor and check its resistance
inverter operating at full load,
with an ohmmeter. The resist-
whereas at light and no load con-
ance reading of a normal operat-
ditions, the inverter runs and
ing capacitor should start at a
functions satisfactorily.
short and then build up to an
acceptable value. If the reading
does not initially show a shorted
condition, this is an indication
that capacitor A1C3 (A1C4) (fig.
6-1) is defective and should be
replaced. Upon completion of
troubleshooting and subsequent
repair, perform a functional
verification of inverter operation
per paragraph 6-9 to recheck the
Change 1
6-3
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