Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual page 240

Service and maintenance
8.2 Replacing the Control Unit
Procedure for replacing a Control Unit without a memory card
● Disconnect the line voltage of the Power Module and (if installed) the external 24 V
● 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.
● Reconnect the signal cables of the Control Unit.
● Connect up the line voltage again.
● The inverter goes into the "ready-to-switch-on" state.
● Check whether the new CU has the same order number and the same or a higher
● If yes, and if you have backed-up the parameters of the Control Unit that was replaced,
● In all other cases, you must recommission the inverter.
Acceptance test of the safety functions
If you have activated the safety functions in the inverter, after you have downloaded the
parameters into the inverter, the following steps are required:
● If you have newly commissioned the inverter, proceed as follows:
● In all other cases, after downloading the parameters into the inverter, the following steps
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supply or the voltage for the relay outputs DO 0 and DO 2 of the Control Unit.
firmware version as the CU that was replaced.
then proceed as follows:
– Load the parameters into the new CU using STARTER or an Operator Panel.
– Switch on the motor and check the function of the drive.
– Temporarily switch-off the CU power supply (Power ON Reset).
– Perform a complete acceptance test, see Complete acceptance test (Page 224).
are required:
– Temporarily switch-off the CU power supply (Power ON Reset).
– Perform a reduced acceptance test. The necessary measures are described in the
Chapter Reduced acceptance test (Page 225).
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA