Maintenance
68
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 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
To remove the fan, undo the fixing screws. Disconnect the cable. Install the new fan
in reverse order.
Capacitors
Reforming
The capacitors must be reformed if the drive has been stored for a year or more. See
page 29 for information on finding out the manufacturing date. For information on
reforming the capacitors, contact your local ABB representative.
Changing
The drive intermediate circuit employs several electrolytic capacitors. Their lifespan
is from 45 000 to 90 000 hours depending on drive loading and ambient
temperature. Capacitor life can be prolonged by lowering the ambient temperature.
It is not possible to predict a capacitor failure. Capacitor failure is usually followed by
a mains fuse failure or a fault trip. Contact ABB if capacitor failure is suspected.
Replacements are available from ABB. Do not use other than ABB specified spare
parts.
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