Capacitors; Reforming The Capacitors - ABB ACS480-04-09A8-1 Hardware Manual

Maintenance 125
6. Replace the fan. The arrow indicating the air flow direction must point up.
7. Connect the fan power cable.
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8. Place the fan cover back on the frame.
9. Push the cover to lock into position.
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Capacitors

The DC link of the drive contains several electrolytic capacitors. Operating time, load,
and surrounding air temperature have an effect on the life of the capacitors. Capacitor
life can be extended by decreasing the surrounding air temperature.
Capacitor failure is usually followed by damage to the unit and an input cable fuse failure,
or a fault trip. If you think that any capacitors in the drive have failed, contact ABB.
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Reforming the capacitors

The capacitors must be reformed if the drive has not been powered (either in storage
or unused) for a year or more. The manufacturing date is on the type designation label.
For information on reforming the capacitors, see Capacitor reforming instructions
(3BFE64059629 [English]) in the ABB Library (https://library.abb.com/en).