Siemens SINAMICS S120 Equipment Manual page 183

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.
● For motors with a single-winding system, the length of the supply cables must be kept to
● A derating factor of 5% must be taken into consideration, regardless of the number of
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
a minimum. The cables lengths are listed in the following tables.
modules connected in parallel.
Cabinet Modules
5.6 Motor Modules in chassis format
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