Siemens SINAMICS S120 Equipment Manual page 76

Mains connection and line-side power components
4.8 Line connection variants
Recommended vector group: Dyn5 or Yyn0
The neutral point must be grounded and connected to the protective conductor of the line
filter or line reactor.
Remark: If the neutral point is not brought out and/or not connected, then all of the
restrictions of an IT line system apply.
Figure 4-22
74
Connecting to the line supply using an isolating transformer
Manual, 06/2019, 6SL3097-5AL00-0BP1
AC Drive