Maintenance 179
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.
Memory unit
After replacing a control unit, the existing parameter settings can be retained by
transferring the memory unit from the defective unit to the new 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 control unit is
powered.
1. Stop the drive and disconnect it from the AC power line. Obey the instructions in
section Electrical safety precautions on page 128.
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.
For other maintenance instructions concerning the BCU control unit, see BCU-02/12/22
control units hardware manual (3AUA0000113605 [English]).
End of the BCU control unit
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