Diagnostics and maintenance 387
ACH550-01 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 Main fan replacement on page
387.
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
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 443). Do not use other than ABB specified spare
parts.
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