ABB Adjustable Speed AC Drive ACS550-U1-046A-2

Fan failure can be predicted by the increasing noise from fan bearings and the gradual rise in the heatsink temperature in spite of heatsink cleaning.

If the drive is operated in a critical part of a process, fan replacement is recommended once these symptoms start appearing.

Replacement fans are available from ABB. Do not use other than ABB specified spare parts.

1. Remove power from the drive.

• R1, R2: Press together the retaining clips on the fan cover sides, and lift.

• R3, R4: Press in on the lever located on the left side of the fan mount, and rotate the fan up and out.

The heatsink fins accumulate dust from the cooling air. Since a dusty heatsink is less efficient at cooling the drive, overtemperature faults become more likely.

In a “normal” environment (not dusty, not clean) check the heatsink annually, in a dusty environment check more often.

Clean the heatsink as follows (when necessary): 1. Remove power from the drive.

3. Blow clean compressed air (not humid) from bottom to top and simultaneously use a vacuum cleaner at the air outlet to trap the dust.

NOTE: If there is a risk of the dust entering adjoining equipment, perform the cleaning in another room.

Barbed retaining clips at each corner pressed toward the center to release the barbs

Housing pulled up to remove from the drive

Fan air flow is up (refer to the arrow on fan)

Fan wire harness is toward the front

Notched housing barb is located in the right-rear corner