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.
￭ 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]).
Control panel
See ACx-AP-x assistant control panels user’s manual (3AUA0000085685 [English]).
Control unit
￭ Replacing the memory unit of ZCU-12
After replacing a control unit, you can retain the existing parameter settings by transferring
the memory unit from the defective control unit to the new control unit. After power-up,
the drive will scan the memory unit. This can take several minutes.
WARNING!
Do not remove or insert the memory unit when the control unit is powered.
1.
Stop the drive and do the steps in section Electrical safety precautions (page 17)
before you start the work.
2. Pull the clip at the side of the memory up.
174 Maintenance
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