Siemens PM240-2 Hardware Installation Manual page 40

Connecting-up
5.1 Line and motor connection
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.
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 for inverters connected to an IT line system
Figure 5-3
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.
40
IT line supply where the neutral conductor N is transferred and with impedance with
respect to the PE protective conductor
Hardware Installation Manual, 12/2015, A5E33294624B AD
Power Module PM240-2