Siemens SINAMICS S120 Function Manual page 329

● Use of suitable line reactors for the Smart Line Modules.
● Use of symmetrical power cabling between the transformer and the parallel-connected
● The current reduction (derating) from the rated value for individual Smart Line Modules in
Figure 7-27
12-pulse parallel connection of Smart Line Modules
With the 12-pulse variant of parallel connection, up to four Smart Line Modules on the line
side are supplied by one three-winding transformer. An even number of Smart Line Modules,
i.e two or four, must be divided equally between the two secondary windings. In contrast to
Basic Line Modules, the Smart Line Modules of both subsystems have to be controlled by
two Control Units due to the 30° phase displacement in the input voltages.
Figure 7-28
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Smart Line Modules (cables of identical type with the same cross-section and length).
a parallel connection is 7.5 %.
Parallel connection SLM 6-pulse single
Parallel connection SLM 12-pulse redundant
7.11 Parallel connection of power units
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Function modules
329