Siemens SINAMICS S120 Manual page 91

Active Line Connection 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 must be removed.
Figure 4-8 Removing the connection clips to the basic interference suppression module in the Active Interface Module,
frame size JX
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A
Electrical installation
4.5 Connections
91