Tt Line System - Siemens SINAMICS G12 Hardware Installation Manual

5.1.2

TT line system

In a TT line system, the transformer grounding
and the installation grounding are independ‐
ent of one another.
There are TT line supplies where the neutral
conductor N is either transferred – or not.
Inverter operated on a TT line system
● Inverter with integrated or external line filter:
– Operation on TT line systems with grounded neutral point permissible.
– Operation on TT line systems without grounded neutral point not permissible.
● Inverter without line filter:
– Operation on all TT line systems 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.
Power Module PM240-2
Hardware Installation Manual, 08/2017, A5E33294624B AG
Connecting-up
5.1 Permissible line supplies
51