Replacing The Control Unit - Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual

Service and maintenance

8.2 Replacing the Control Unit

8.2 Replacing the Control Unit
230 V AC can be connected via the relay outputs DO 0 and DO 2 of the Control Unit. These
terminals can carry 230 V AC independent of the voltage condition of the Power Module.
Therefore please observe appropriate safety measures when working on the inverter.
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
● 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
● 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
● Switch on the motor and check the function of the drive.
282
WARNING
supply or the voltage for the relay outputs DO 0 and DO 2 of the Control Unit.
number and the same or a higher firmware version as the CU that was replaced.
power failure) in its internal parameter memory, and switches to "ready to start" state.
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD