Siemens SINAMICS S120 Device Manual page 219

Parallel connection of Motor Modules to increase power rating
The following rules must be observed when connecting Motor Modules in parallel:
● Up to 4 identical Motor Modules can be connected in parallel.
● A common Control Unit is required whenever the modules are connected in parallel.
● The motor supply cables must be the same length (symmetrical design).
● Power must be supplied to the Motor Modules from a common DC busbar.
● A derating factor of 5 % must be taken into consideration, regardless of the number of
modules connected in parallel.
● For motors with a single-winding system, the length of the supply cables must be kept to
a minimum. The cables lengths are listed in the following tables.
Figure 5-38
Figure 5-39
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A
Motor with electrically isolated winding systems supplied by a parallel connection of
S120 Motor Modules
Motor with common winding system supplied by a parallel connection of S120 Motor
Modules
Cabinet Modules
5.6 Motor Modules in chassis format
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