Line-side power components
3.8 Line connection versions
SINAMICS S120 Combi
56 Manual, 11/2017, 6SL3097-4AV00-0BP7
Application example:
● The motor insulation must be protected from excessive voltages.
Figure 3-10 Operation via an autotransformer
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.
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