Siemens SINAMICS S120 Manual page 101

Smart Line Modules
If the device is operated on an ungrounded / IT system, the connection clip to the basic
interference suppression module must be removed.
With frame sizes HX and JX, you must remove the left-hand fan before removing the
connection bar (see chapter "Replacing components").
Figure 4-16
Cabinet Modules
Manual, 03/2013, A5E03263538A
Removing the connection clip to the basic interference suppression module in the Smart
Line Module for frame size GX
Electrical installation
4.6 Connections
99