MOTOR ALTERNATING CURRENT (B2)

TM 5-4120-359-14

Figure 4-63. Motor (B2) Test

(2) Using multimeter check continuity between all J11 pins and motor housing. Continuity should exist only on

pin D.

(3) Using multimeter, measure 3 phase windings at J11:

A to B

B to C

A to C

All resistances should be above zero, but less than 2 ohms.

(4) Using multimeter, check J11. Pin D is ground. Check pins A, B, C, E, and F to pin D. There should be no

reading. Check pin D to motor frame, multimeter should read 0.

(5) Using multimeter, measure resistance between pins E and F. Resistance should be zero meaning the switch

is closed.

(6) Motor with shorted, open or grounded windings or open thermostatic switch should be replaced.

Follow-on Procedures: 1. Install top condenser cover. (See paragraph 3-25.)

2. Connect power.

4-64. MOTOR ALTERNATING CURRENT (B2)

Preliminary Procedures:

1. Disconnect power.

2. Remove top condenser cover. (See paragraph 3-25.)

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