Siemens SINAMICS S120 Device Manual page 98

Electrical installation
4.5 Connections
Active Line Modules
When the unit is operated on an ungrounded system (IT system), the connection clip to the
basic interference suppression module of the Active Interface Module (-A2) must be
removed.
Figure 4-19
98
Removing the connection clip to the basic interference suppression module in the Active
Interface Module, frame size FX
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A