102 Maintenance
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
28 for information on finding out the manufacturing date. For information on reforming the
capacitors, contact your local ABB representative.
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