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146 Maintenance
Control unit
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.
Memory unit
After replacing a control unit, the existing parameter settings can be retained by
transferring the memory unit from the defective control unit to the new control unit.
WARNING! Only qualified electricians are allowed to do this work. Read the
complete safety instructions of the drive. Ignoring the instructions can cause
physical injury or death, or damage to the equipment.
WARNING! Do not remove or insert the memory unit when the drive control unit is
powered.
1. Disconnect the drive from the AC power line and make sure it is safe to start the work.
See section
Basic electrical safety precautions
2. Make sure that the control unit is not powered.
3. Undo the fastening screw and pull the memory unit out.
4. Install a memory unit in reverse order.
on page 96.
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