Control units
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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.
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Replacing the memory unit (BCU)
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.
Obey the safety instructions of the drive. If you ignore them, injury or death, or damage
to the equipment can occur. If you are not a qualified electrical professional, do not
do installation, commissioning or maintenance work.
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 21)
before 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
Obey the safety instructions of the drive. If you ignore them, injury or death, or damage
to the equipment can occur. If you are not a qualified electrical professional, do not
do installation, commissioning or maintenance work.
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 Electrical safety precautions (page 21)
before you start the work.
2. Undo the fastening screw and remove the battery.
3. Replace the battery with a new BR2032 battery.
Maintenance 217
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