178 Maintenance
Capacitors
The DC circuit contains several electrolytic capacitors. Their lifespan depends on the
operating time, loading and ambient temperature. Capacitor life can be prolonged by
lowering the ambient temperature. In frame R8i, the capacitors are separate.
Capacitor failure is usually followed by damage to the unit and an input 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. Contact an ABB service
representative for spare parts and repair services.
Reforming the capacitors
The DC circuit capacitors must be reformed if the module has been stored for a year or
more. See section Type designation labels (page 45) for information on finding out the
manufacturing date. For information on reforming the capacitors, see Converter module
capacitor reforming instructions (3BFE64059629 [English]).
Control panel
Replacing the battery
1. Turn the lid on the back of the panel counter-clockwise until the lid opens.
2. Replace the battery with a new CR2032 battery.
3. Put the lid back and tighten it by turning it clockwise.
4. Dispose of the old battery according to local disposal rules or applicable laws.
Cleaning the control panel
See ACX-AP-x assistant control panels user’s manual (3AUA0000085685 [English]).
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