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