Maintenance 133
Procedure:
1. Stop, de-energize and ground the drive following the steps in section Shutting down
the drive for maintenance before you start the work.
2. Switch off all miniature circuit breakers in the control compartment.
3. Unplug all connectors on the BCU.
4. Loosen the end brackets of BCU.
5. Keep the top of the BCU (looking to the back in cabinet) in place and twist the bottom
(looking towards you) to pull it out of the mounting rail.
When a BCU is replaced, the parameter settings can be retained by transferring the
memory unit (ZMU) from the defective BCU to the new BCU. The ZMU is located on the
control unit, see B in figure Replacement of BCU components below.
View from bottom of cabinet
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