ABB ACH550-01 User Manual page 381

ACH550 User's Manual
Capacitors
Reforming
The drive DC link capacitors need to be reformed (re-aged) if the
drive has been non-operational for more than one year. Without
reforming capacitors may be damaged when the drive starts to
operate. It is therefore recommended to reform the capacitors
once a year. See page
manufacture from the serial number shown on the drive labels.
For information on reforming the capacitors, refer to Guide for
Capacitor Reforming in ACS50/150/350/550 [3AFE68735190
(English)], available on the Internet (go to
and enter the code in the Search field).
Replacement
The drive intermediate circuit employs several electrolytic
capacitors. 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 an input power fuse failure or a fault trip.
Contact ABB if capacitor failure is suspected. Replacements for
frame sizes R5 and R6 are available from ABB. Do not use other
than ABB specified spare parts.
Diagnostics and maintenance
16 for how to check the date of
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