Section IV. VERIFICATION AND ADJUSTMENT

TM 11-6130-377-14

WARNING

k. Close front indicator panel and secure the four

To avoid injury and possible death of

turn fasteners.

personnel, use extreme caution with

l. Position back panel in place and align screw

all components marked "HIGH

holes. Install ten long screws and lockwashers in the

VOLTAGE."

Ensure

that

all

outboard screw holes and three short screws and

capacitors are discharged after

lockwashers in the center three holes. Tighten screws.

power has been removed.

m. Perform functional verification of the inverter

a. Position the DC circuit breaker A1CB1 to OFF.

(para 6-22).

b. Open front indicator panel to give access to

interior of unit.

6-20.

Resistor A1R6 Replacement (1973 Model

Only)

(fig. 6-1)

NOTE

To remove and replace a defective A1R6 resistor

Step c is to be accomplished only if a

proceed as follows:

rear pair of capacitors, either right or

a. Position the DC circuit breaker A1CB1 to OFF.

left side, must be removed.

b. Remove twelve screws and washers securing

the top cover of the inverter and remove cover.

c. Remove 13 screws and washers securing the

c. Remove the electrical leads from the resistor

rear panel and remove the rear panel.

terminals. Tag the leads to ensure proper replacement.

d. Disconnect and tag the electrical leads to the

d. Remove two screws, washers and nuts securing

capacitors to be removed.

resistor to side panel and remove resistor.

e. Working from the outside of the unit, remove

e. Position new resistor on side panel and install

the two screws and lockwashers securing the capacitor

two screws from side panel through mounting lugs of

clamp for the pair which is to be removed.

resistor. Install washers and nuts, tighten nuts to secure

f. Lift up and remove the capacitor(s).

resistor.

g. Position a new capacitor in place of the one or

f. Install electrical leads to their respective

more removed in step f.

terminals of the resistor.

h. Install the capacitor clamp around the capacitors

g. Position the top cover in place and align the

and align the screw holes in the clamp and side panel.

screw holes. Install twelve screws and lockwashers and

i. Install the two screws and lockwashers and

tighten screws.

h. Perform a functional verification of the inverter

j. Reconnect the electrical leads to their proper

(para 6-22).

terminals.

Section IV. VERIFICATION AND ADJUSTMENT

6-21. General

capacitors are discharged after

This section contains procedures for performing a low

power is removed and do not attach

and high voltage fault adjustment and a functional

test equipment with the Inverter

verification of the inverter operation. The following

operating.

procedures are performed when troubleshooting

indicates that an adjustment of functional verification is

a. Open front panel to gain access to the DC

required.

INPUT terminals and the AC OUTPUT terminals.

b. Pull out the plunger of the door interlock switch

6-22.

Functional Verification of the Inverter

A1S1 to enable the inverter to function with the front

panel open (para. 6-5).

WARNING

c. Install the test equipment and connect it to the

To avoid injury and possible death of

inverter as shown in figure 6-2.

personnel, use extreme caution with

d. Set the DC variable power source to 115 vdc.

all components marked "HIGH

VOLTAGE." Be sure that all

Change 1

6-17