Siemens SINAMICS S120 Manual page 172

Cabinet Modules
6.3 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 four 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 6-14
Figure 6-15
172
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 liquid cooled
Manual, 10/2015, A5E37067587A