Operation Of The Line Connection Components Via An Isolating Transformer - Siemens SINAMICS S120 Combi Manual

Line-side power components
3.8 Line connection versions
Application example:
● The motor insulation must be protected from excessive voltages.
Figure 3-10
3.8.3.4

Operation of the line connection components via an isolating transformer

An isolating transformer converts the line supply type of the plant or system (e.g. IT system)
to a TN system. Additional voltage adaptation to the permissible voltage tolerance range is
possible.
An isolating transformer must be used in the following cases:
● The insulation of the Motor Module and/or the motor is not suitable for the voltages that
occur.
● There is no compatibility with an existing residual-current protective device.
● The installation altitude is greater than 2000 m above sea level, and no TN or TT line
system with grounded neutral point is used.
● A line filter should be used in a line supply system that is not a TN line supply system with
grounded neutral conductor.
56
Operation via an autotransformer
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7