Siemens SINAMICS G120 Function Manual page 130

Servicing and maintenance
5.2 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
After replacing the Control Unit, you must conduct an acceptance test of the safety functions.
● If you have newly commissioned the inverter, the following steps are required: :
● 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.
– Power ON Reset
– Perform a complete acceptance test, see Complete acceptance test (Page 116).
are required:
– Power ON Reset
– Perform a reduced acceptance test. The reduced acceptance tests are described in
Section Reduced acceptance test (Page 117).
Safety Integrated Function Manual, SINAMICS G120
Function Manual, 07/2010, FW 4.3.2, A5E03052391B AA