Siemens SINAMICS G120X - IT System; Removing Functional Grounding of the Converter; Converter Operated on an IT System

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.
Function description
Table 4-3 Converter operated on an IT system
Converter Line supply with grounded neutral Line supply with grounded phase conduc‐
tor and a voltage ≤ 600 V phase to phase
Frame size A B C D E F G H J A B C D E F G H J
Without line
filter
✓ ✓ ✓ ✓ ✓ ✓ ○ ○ ○ ✓ ✓ ✓ ✓ ✓ ✓ ○ ○ ○
Integrated
line filter C2
- - - - - - - ○ ○ - - - - - - - ○ ○
Integrated
line filter C3
○ ○ ○ ○ ○ - ✓
1)
✓
1)
✓
1)
○ ○ ○ ○ ○ - ✓
1)
✓
1)
✓
1)
✓ = 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 78)
4.1.1.4 Removing functional grounding of the converter
If you wish to use the converters with C2/C3 line filter, note the information in the following
sections:
TN system (Page 75)
Wiring
4.1 Line supply and motor
SINAMICS G120X converter
78 Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC