Operating Line Connection Components Via An Isolating Transformer - Siemens SINAMICS S120 Equipment Manual

Line Connection Booksize
2.13 Line connection variants
2.13.3.7

Operating line connection components via an isolating transformer

The isolating transformer converts the network configuration of the system (e.g. IT/TT
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
● There is no compatibility with an existing residual-current protective device.
● The installation altitude is higher than 2000 m above sea level.
● A line filter should be used in a line supply system that is not a TN line supply system
134
occur.
with grounded neutral conductor.
Note
In IT systems and when a Basic Line Filter is used, the connection bracket for the
interference-suppression capacitor must be removed when a 80 kW or 120 kW Active
Interface Module is used.
CAUTION
If the supply voltage is greater than 480 V +10 %, it is not permissible to use an
autotransformer.
An isolating transformer must be used to ensure protective separation.
Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
Booksize power units