Siemens SINAMICS G120 - IT System

4.4.3 IT system
In an IT line system, all of the conductors are
insulated with respect to the PE protective
conductor – or connected to the PE protective
conductor through an impedance.
There are IT systems with and without transfer
of the neutral conductor N.
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Operation of the inverter with a PM330 Power Module on the IT system
When connected to an IT line supply, you must open the connection to the basic interference
suppression board of the Power Module.
Further information is provided on the Internet:
Hardware installation manual for PM330 Power Modules (https://
support.industry.siemens.com/cs/ww/en/view/109742506)
Behavior of the inverter when a ground fault occurs
In some instances, even for a ground fault at the inverter output, the inverter should still remain
functional. In cases such as these, you must install an output reactor. This prevents an
overcurrent trip or damage to the drive.
Installing
4.4 Connecting the line supply and motor
Converter with the CU230P-2 Control Units
86 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE