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Chapter 4. OPERATOR AND ORGANIZATIONAL MAINTENANCE
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TM-11-6130-377-14 Inverter Power Static PP-7078/U Manual
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Section III. ORGANIZATIONAL MAINTENANCE
TM 11-6130-377-14
4-6. Weekly Preventive Maintenance Checks and Services Chart
Sequence
No.
Item
Procedure
References
1
Meters ................................ .......
Check that the glass on all meters is clean. Clean the glass on
Para 4-7
all meters as required.
2
Corrosion ................................ ...
Check that exterior surfaces of the inverter are free of rust and
corrosion.
4-7. Cleaning
noisy, or seems to be scraping, notify higher echelon
maintenance without delay. Use the procedures given in
a. Exterior Surfaces. Inspect the exterior of inverter.
the following steps to check operation of fans.
The exterior surfaces should be clean, and free of dirt,
dust, grease, and fungus.
a. Place hand over the three air filter screens (fig. 3-
1) on the front panel and check that air is being sucked in
(1)  Remove the dust and loose dirt with a
through the filter.
clean, soft cloth.
b. Place hand over the rear two air filter screens (fig.
WARNING
2-1) on the right hand side panel and check that air is
being sucked in through the filter.
The fumes of trichloroethane are toxic.
c.  Place hand over the heat sink fan exhaust
Provide thorough ventilation whenever
opening located on the right side panel (fig. 2-1) and
used. DO NOT use near open flame.
check that air is being blown out of the screen.
Trichloroethane is not flammable, but
4-9. Operational Checks
exposure to open flames converts the
fumes  to  highly  toxic  dangerous
Operational checks consist of a cursory observation of the
gases.
inverter performance during normal operation (para 3-3
and 3-4).  If an abnormal indication is obtained during
(2)  Remove grease, fungus, and ground-in dirt
operation of the equipment, refer to higher echelon
using a cloth dampened (not wet) with trichloroethane.
maintenance.
(3)  Remove dust or dirt from terminals with
brush.
4-10. Operator Troubleshooting
CAUTION
a. General. Operator troubleshooting is based on a
Do not press on the meter faces
cursory observation of the inverter performance by the
(glass) when cleaning; the meter may
operator.
When trouble is encountered during this
be damaged.
observation of equipment performance note the abnormal
indications and read down the Trouble symptoms column
(4)  Clean the front panel, meters, and control
of the following troubleshooting chart, beginning with item
knobs; use a soft, clean cloth. If dirt is difficult to remove,
No. 1, until the trouble symptom appears. Comply with
dampen the cloth with water; mild soap may be used for
the indicated disposition in taking corrective measures for
more effective cleaning.
the trouble symptom.  Any trouble that is beyond the
4-8. Operation of Fans
scope of the operator shall be referred to a higher
The operator must check the operation of fans in the
echelon.
inverter on a daily basis. If any fan is not operating, is
b. Operator Troubleshooting Chart
Item
No.
Trouble symptom
Corrective measures
1
AC VOLTAGE meter indicates below 114 vac or above
Defective inverter; higher maintenance repair required.
121 vac.
2
AC circuit breaker is ON but AC VOLTAGE meter in-
a.
Defective inverter. Turn off ac power switch connected
dicates 0 volt internal current-limiting circuit may be
between inverter and ac equipment.
activated).
(1)
If AC VOLTAGE meter still indicates 0 volt, inverter is
defective.
(2)
If normal AC VOLTAGE indication is obtained, reset ac
power switch to off and proceed to b below.
b.
Defective ac equipment or wiring.  Among equipment
being fed by inverter, start turning off one unit after the
other while observing AC VOLTAGE meter for return of
normal indication (120 vac) which should occur when
shorted equipment is turned off.
If normal AC!'
VOLTAGE meter indication is not obtained after all ac
equipment is turned off, wiring between inverter and ac
equipment is defective.
4-2

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