Maintenance 121
Capacitors
The inverter intermediate circuit employs several electrolytic capacitors. Their lifespan
depends on the inverter loading and ambient temperature. Capacitor life can be prolonged
by lowering the ambient temperature. Capacitor life shortens in high ambient temperatures
and under heavy loading.
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.
Reforming the capacitors
Reform (re-age) spare part capacitors once a year according to Capacitor reforming
instructions (3BFE64059629 [English]).
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