Tn Line System; Tt Line System - Siemens SINAMICS G115D Operating Instructions Manual

4.2.1

TN line system

A TN system transfers the PE protective conductor to the installed plant or system using a
cable.
The TN system can transfer the neutral conductor N and the PE protective conductor either
separately or combined.
Generally, in a TN system the neutral point is grounded. There are versions of a TN system
with a grounded line conductor, e.g. with grounded L1.
G115D drives can only be operated in a line system with grounded neutral point and are not
suitable for corner-grounded networks.
Converter operated on a TN system
Converter
Frame size
Integrated line filter C2
✓ Operation permissible
4.2.2

TT line system

In a TT system, the transformer grounding and the installation grounding are independent of
one another.
There are TT supplies where the neutral conductor N is either transferred – or not.
SINAMICS G115D distributed drive
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
4.2 Permissible line supplies
Line supply with grounded neutral
A
✓
Wiring
B
✓
45