Service and maintenance
8.2 Replacing the Control Unit
Inverter with CU240B-2 and CU240E-2 Control Units
242 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
8.2 Replacing the Control Unit
After commissioning has been completed, we recommend that you back up your settings on
an external storage medium, e.g.: on a memory card or the operator panel.
If you do not back up your data, you have to recommission the drive when you replace the
Control Unit.
Procedure for replacing a Control Unit with a memory card
● Disconnect the line voltage of the Power Module and (if installed) the external 24 V
supply or the voltage for the relay outputs DO 0 and DO 2 of the Control Unit.
● Remove the signal cables of the Control Unit.
● Remove the defective CU from the Power Module.
● Plug the new CU on to the Power Module. The new CU must have the same order
number and the same or a higher firmware version as the CU that was replaced.
● Remove the memory card from the old Control Unit and insert it in the new Control Unit.
● Reconnect the signal cables of the Control Unit.
● Connect up the line voltage again.
● The converter adopts the settings from the memory card, saves them (protected against
power failure) in its internal parameter memory, and switches to "ready to start" state.
● Switch on the motor and check the function of the drive.
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