Maintenance
108
Capacitors
The drive intermediate circuit employs several electrolytic capacitors. Their lifespan
is at least 90 000 hours depending on the operating time of the 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
damage to the unit and an input cable 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.
Reforming the capacitors
The capacitors must be reformed if the drive has been stored for a year or more. See
page 32 for information on finding out the manufacturing date. For information on
reforming the capacitors, contact your local ABB representative.
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