Siemens SINAMICS G130 Engineering Manual page 72

Fundamental Principles and System Description
Engineering Information
b) Supply from different medium-voltage supply systems:
- The master infeed is supplied via isolation transformer 1, whereby the secondary winding can be either
grounded (TN supply system) or non-grounded (IT supply system). With respect to voltage loads on
the DC link and on the motor windings to ground, however, operation with a non-grounded IT supply
system is preferable.
- The slave infeed(s) must be supplied by its/their own isolation transformer, whereby all secondary
windings must be non-grounded.
SINAMICS Engineering Manual – May 2008
72/396
© Siemens AG