ABB DriveIT ACH550-01 User Manual page 372

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 drive.
2. Remove the cooling fan (see section "Main fan
replacement" .
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. Replace the cooling fan.
5. Restore power.
Main fan replacement
The drive's main cooling fan has a life span of about 60,000
operating hours at maximum rated operating temperature and
drive load. The expected life span doubles for each 10ºC (18ºF)
drop in the fan temperature (fan temperature is a function of
ambient temperatures and drive loads).
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.
368
ACH550 User's Manual
Diagnostics and maintenance