Siemens SINAMICS G120XA - Operating the Converter on a TN Line System; TT System

A TN system transfers the PE protective conductor to the installed plant or system using a cable.
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.
The TN system can transfer the neutral conductor N and the PE protective conductor either
separately or combined.
Operating the converter on a TN line system
Table 4-1 Converter operated on a TN system
Converter Line supply with grounded neutral
Frame size A B C D E F G H J
Without line filter ✓ ✓ ✓ ✓ ✓ ✓ ○ ○ ○
Integrated line filter C3 ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
✓ = Operation permissible
✓
1)
Operation permissible once grounding screw has been removed
If the grounding screw has been removed, the converter no longer fulfills the requirements of class C3.
- Operation not permissible
○ Converter not available
More information on removing the grounding connection in the converter:
Removing functional grounding of the converter (Page 60)
4.1.1.2 TT system
Overview
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Figure 4-2 TT 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.
Wiring
4.1 Line supply and motor
SINAMICS G120XA converter
58 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB