Line Connection Versions; Ways Of Connecting The Line Supply - Siemens SINAMICS S120 Combi Manual

Line-side power components

3.8 Line connection versions

3.8 Line connection versions
3.8.1

Ways of connecting the line supply

The following line connection versions are possible:
● Line connection components to be directly connected to the line supply
● Operation of the line connection components via an autotransformer
● Operation of the line connection components via an isolating transformer
Note
Line connection of motors
In combination with the drive system, the motors are generally approved for operation on
TN and TT line supplies with grounded neutral point and on IT line supplies.
In operation on IT line supplies, the occurrence of a first fault between an active part and
ground must be signaled by a monitoring device. The first fault must be removed as
quickly as possible to minimize temporary overload of the motor insulation.
For all other line supplies, except TN and TT line supplies with grounded neutral point
and IT line supplies, such as line supplies with a grounded phase conductor, an isolation
transformer with grounded neutral point (secondary side) must be connected between the
line supply and the drive system in order to protect the motor insulation from a continuous
and inadmissibly high stress level.
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SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7