Siemens SINAMICS S120 Manual page 192

Cabinet Modules
5.6 Chassis format Motor Modules
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
● For motors with a single-winding system, the length of the supply cables must be kept to
192
modules connected in parallel.
a minimum. The cables lengths are listed in the following tables.
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A