Chapter 6 – Preventive Maintenance
6-2 ACS 600 MultiDrive
Capacitors
The ACx 600 intermediate circuit employs several electrolytic
capacitors. The lifespan of the capacitors is approximately 100 000
hours, depending on the frequency converter loading and the ambient
temperature.
Capacitor life can be prolonged by lowering the ambient temperature. It
is not possible to predict 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 attempt operation with other than ABB
specified spare parts.
Reforming Converter DC link capacitors need to be reformed (re-aged) if the
converter has been non-operational for more than one year. Without
reforming capacitors may be damaged when the converter starts to
operate. The reforming methods introduced here require that the
converter has been stocked clean and dry. It is recommended to reform
the capacitors once a year.
How to check the
converter age
Converter serial number defines the week, when the converter has
been built:
• 8 digit: e.g. 18250125, 1 denotes manufacturing country (1 =
Finland), 8 manufacturing year (1998), 25 manufacturing week and
0125 running manufacturing number.
• 10 digit: e.g. 1983200725, 1 denotes manufacturing country, 98
manufacturing year, 32 manufacturing week and 00725 running
manufacturing number.
Reforming time The intermediate circuit of the converter is kept at its nominal voltage
for the reforming time to “wake up” the capacitors. The reforming time
required depends on how long the converter has been stocked (non-
operational).
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