Siemens SINAMICS S120 Function Manual page 326

Function modules
7.11 Parallel connection of power units
6-pulse parallel connection of Basic Line Modules
With the 6-pulse variant of parallel connection, up to four Basic Line Modules on the line side
are supplied by a shared two-winding transformer and controlled by a shared Control Unit.
Figure 7-23
Figure 7-24
326
Parallel connection BLM 6-pulse single
Parallel connection BLM 6-pulse redundant
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Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions