Siemens SINAMICS G120 Operating Instructions Manual page 72

Installing
4.5 Connecting the line supply, motor and converter components
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 line supplies where the neutral conductor N is either transferred – or not.
Inverter operated on an IT line system
● Inverters with integrated line filter:
– Operation on IT line systems not permissible.
● Inverter without line filter:
– Operation on all IT line systems permissible.
Example of a Power Module connected to an IT line system
Figure 4-10
Behavior of the inverter when a ground fault occurs
In some instances, even for a ground fault, 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.
Special measures for PM330 Power Modules
When connected to an IT line supply, you must open the connection to the basic interference
suppression board of the Power Module. You can find additional information on the Internet:
Hardware installation manual for PM330 Power Modules
(https://support.industry.siemens.com/cs/ww/en/view/90580072/64282054155).
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IT line supply where the neutral conductor N is transferred and with impedance with
respect to the PE protective conductor
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB