Siemens SINAMICS G120XA - Function Description; Converter Operated on a TT System; IT System

Function description
Table 4-2 Converter operated on a TT 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)
4.1.1.3 IT system
Overview
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Figure 4-3 IT system
In an IT 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.
Wiring
4.1 Line supply and motor
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB 59