Maintenance 143
Cooling fan
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 heat sink temperature in spite of heat sink 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.
Removing the fan
Place the drive on its side as shown. Push in the two retaining clips (1) at the back of
the drive. Remove the base (2) by pulling on the top edge first. Disconnect the fan
cable (3). Carefully bend the clips on the fan holder (4) to release the fan.
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