Alliance Laundry Systems BU170S Service Manual download pdf (Page 77)

70422201R1

LED OPL and UniLinc Troubleshooting

44.No Fan Motor Rotation

Is there 24 volts AC at

H6-1 to H6-9?

Is there 24 volts AC st

H6-5 to H6-11?

Check Transformer

and Fuse F3.

Replace or

repair harness.

Yes

TMB2374S

NOTE: All mechanical checks should be performed prior to starting the electrical checks. Ensure the belt(s), basket, idler

and pulleys are rotating freely.

Is there 24 volts AC at

contactor A1 to A2

(or Brown/Red to White)?

Is there 5 volts

DC at H3-1 to H3-11 with

contactor commanded to close

and 0 volts DC with

contactor not

commanded?

Check control harness

H3 and front-end control (AP2.)

Replace as required.

Check control harness

H3 and I/O board (API).

Replace or repair

as required.

NOTE: The following checks are DC voltage checks.

CAUTION: Always power down the machine PRIOR to

disconnecting or connecting the H3 harness. Once

harness is disconnected, you can power up the machine

for troubleshooting. Failure to do so may damage

the front-end control.

NOTE: The H3 harness will need to remain

connected during this test.

Replace contactor.

Is there line voltage

on the motor side

of the contactor?

Replace contactor.

Check incoming

power and wiring.

Replace or repair

as required.

Is contactor

energizing?

NOTE: The following checks are AC voltage

checks and should be equal to the line voltage

of the machine. Refer to the serial plate of the

machine for correct line voltage. The machine’s

motor(s) may be single or three phase.

Is there line voltage

on the line side of the

contactor?

Yes

Replace contactor.

Repair or replace

wiring harness.

Yes

Is there line voltage

at the motor?

(1)

(2)

(4)

(3)

(5)

(6)

(7)

NOTE: If the voltage is present but

lower than 24volts AC, ensure the

correct transformer configuration

jumper is installed.

TMB2374S

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Alliance Laundry Systems BU170S Service Manual Page 77

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