Maintenance
98
Heatsink
The heatsink fins pick up dust from the cooling air. The drive runs into
overtemperature warnings and faults if the heatsink is not clean. In a “normal”
environment (not dusty, not clean) the heatsink should be checked annually, in a
dusty environment more often.
Clean the heatsink as follows (when necessary):
1. Remove the cooling fan (see section Fan).
2. 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.
3. Refit the cooling fan.
Fan
The lifespan of the cooling fan depends on the drive usage and ambient
temperature. See the appropriate ACS800 firmware manual for an actual signal
which indicates the hours of usage of the fan. For resetting the running time signal
after a fan replacement, refer to the firmware manual.
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.
Fan replacement (R2, R3)
To remove the fan, release the retaining clips. Disconnect the cable. Install the new
fan in reverse order.
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