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70 Maintenance
Control units
BCU control unit types
￭
There are three variants of the BCU control unit used in ACS880 drives: BCU-02, BCU-12
and BCU-22. These have a different number of converter module connections (2, 7 and 12
respectively) but are otherwise identical. The three BCU types are interchangeable as long
as the number of connections is sufficient. For example, the BCU-22 can be used as a direct
replacement for both BCU-02 and BCU-12.
Replacing the memory unit
￭
After replacing a control unit, you can keep the existing parameter settings by transferring
the memory unit from the defective control unit to the new control unit.
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
you start the work.
2. Make sure that the control unit is not powered.
3. Remove the fastening screw and pull the memory unit out.
4. Install a memory unit in reverse order.
Replacing the BCU control unit battery
￭
Replace the real-time clock battery if the BATT OK LED is not illuminated when the control
unit is powered.
1. Stop the drive and do the steps in section
you start the work.
2. Undo the fastening screw and remove the battery.
3. Replace the battery with a new BR2032 battery.
Electrical safety precautions (page 27)
Electrical safety precautions (page 27)
before
before
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