Weekly Preventive Maintenance Checks and Services Chart

TM 11-6130-377-14

4-6. Weekly Preventive Maintenance Checks and Services Chart

Sequence

No.

Item

Procedure

References

Meters ................................ .......

Check that the glass on all meters is clean. Clean the glass on

Para 4-7

all meters as required.

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

AC VOLTAGE meter indicates below 114 vac or above

Defective inverter; higher maintenance repair required.

121 vac.

AC circuit breaker is ON but AC VOLTAGE meter in-

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.

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