Siemens SINAMICS G120 Function Manual page 183

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 converter goes into the "ready-to-switch-on" state.
● If you have backed up your settings:
● If you have not backed up your settings, then you must recommission the drive.
Inverter with enabled safety functions
If you replace an inverter with enabled safety functions, then you also need to confirm the
safety function settings on the new inverter. You will find the procedure in Section:
Downloading parameters (Page 161).
Acceptance test
If you activated the safety functions in the inverter, after replacing the inverter you must
perform an acceptance test for the safety functions.
● Switch off the inverter supply voltage.
● Wait until all LEDs on the inverter go dark. Now switch on the inverter power supply again
● If you commissioned the inverter for the first time, carry out a complete acceptance test,
● In all other cases, after downloading the parameters into the inverter, carry-out a reduced
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB
5.1 Replacing components of the modular SINAMICS G120 inverter
supply or the voltage for the relay outputs DO 0 and DO 2 of the Control Unit.
– Load the settings from the operator panel or via STARTER into the converter.
– For converters of the same type and the same firmware version, you can now switch-
on the motor. Check the function of the drive
– For different converter types, then the converter outputs alarm A01028. This alarm
indicates that the settings that have been loaded are not compatible with the
converter. In this case, clear the alarm with p0971 = 1 and recommission the drive.
(power on reset).
see Complete acceptance test (Page 165).
acceptance test. The reduced acceptance test is described in Section Reduced
acceptance test (Page 166).
Servicing and maintenance
181