Siemens SINAMICS G120C Operating Instructions Manual page 62

Installing
4.8 Connecting the inverter
TT system
In a TT line system, the transformer grounding and the installation grounding are
independent of one another.
There are TT line supplies where the neutral conductor N is either transferred – or not.
Preconditions and restrictions when connecting an inverter to a TT line system
● Inverter with integrated or external line filter:
– Operation on TT line supply systems with grounded neutral point permissible.
– Operation on TT line systems without grounded neutral point not permissible.
● Inverter without line filter:
– Operation on TT line systems is permissible.
● For installations in compliance with IEC, operation on a TT line system is permissible. For
installations in compliance with UL, operation on a TT line system is not permissible.
Inverter connected to a TT line supply
Figure 4-14
58
TT line system where the neutral conductor N is transferred
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
SINAMICS G120C converter