ABB ACH550-02-645A-4 [393/454] Heatsink

Diagnostics and maintenance 389

ACH550-02 User's Manual

Heatsink

The heatsink fins accumulate dust from the cooling air. Since a

dusty sink 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.

Check the heatsink as follows (when necessary):

1. Remove power from the drive.

2. Remove the cooling fan (see section Main fan replacement

on page 389.

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 a risk of the dust entering adjoining equipment,

perform the cleaning in another room.

4. Reinstall the cooling fan.

5. Restore power.

Main fan replacement

The actual lifespan of the cooling fan depends on the drive

usage and ambient temperature. 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 (see page 421). Do

not use other than ABB specified spare parts.