Specifications

Printed in the U.S.A.

AE8-1368 R2

Contactor Coil Lockout

Turn off the pilot circuit and

“open” the motor power

breaker.

Unplug the contactor output

leads at the contactor (or pilot

relay). Measure the contactor

(or pilot relay) coil resistance

Is the coil resistance less

than the mfgs’ minimum

specified?

Replace the relay

or contactor coil

Does the compressor

generate a “No 3-phase

power” fault?

With the contactor

output unplugged,

turn on pilot circuit

and send a “run”

command

Does the compressor still

generate a contactor coil

lockout?

Compressor harness short or

failed control module

- Unplug the contactor output

connectors in the terminal

box and repeat the test to

help determine the location

of the wiring short.

Yes

No Yes

Replace coil

(failure under

load)

Yes

The contactor coil lockout protects the circuit from high current (3 + 0.5

amps) resulting from a “shorted” coil or harness. The control module

must be re-set to clear the lockout.

6.19