1.
Stop the drive and do the steps in section Electrical safety precautions (page 18) before
you start the work.
2. Pull the clip at the side of the memory up.
3. Take the unit off.
4. Replace the unit in reverse order.
￭ Replacing the ZCU-12 control unit battery
The control unit battery is of type CR2032. For instructions on how to replace the control
unit battery, contact an authorized ABB service center.
ZCU-14 control unit
￭ Replacing the memory unit of ZCU-14
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.
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or death,
or damage to the equipment can occur.
194 Maintenance
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