Operation Via A Matching Transformer - Siemens SINAMICS S120 Combi Equipment Manual

Line-side power components
2.8 Line connection versions
2.8.3.3

Operation via a matching transformer

Operating line connection components via an autotransformer
An autotransformer can be used to adapt the voltage in the range up to 3-ph. 480 V AC
+10 %.
To ensure protective separation an isolation transformer must be used for voltages greater
than 3-ph. 480 V AC + 10 %.
Application example:
● The motor insulation must be protected from excessive voltages.
52
DANGER
Figure 2-12 Operation via an autotransformer
SINAMICS S120 Combi
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0