
386 Diagnostics and maintenance
ACH550-01 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 16 for how to check the date of
manufacture from the serial number shown on the drive labels.
For information on reforming the capacitors, refer to Guide for
Capacitor Reforming in ACS50, ACS55, ACS150, ACS310,
ACS320, ACS350, ACS550 and ACH550 (3AFE68735190
[English]), available on the Internet (go to www.abb.com 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 (see page 441).
Replacements for frame sizes R5 and R6 are available from
ABB. Do not use other than ABB specified spare parts.
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