Parallel Connection Of Motor Modules - Siemens SINAMICS S120 Equipment Manual

6.6.5

Parallel connection of Motor Modules

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 have the same length (symmetrical design).
● Power must be supplied to the Motor Modules from a common DC link.
● For motors with a single winding system, supply cables with a minimum length or motor
reactors must be used. The cable lengths are listed in the following tables.
● For motors with multi-winding systems, carefully observe the notes provided in the Low
Voltage Configuration Manual.
● A derating factor of 5% must be taken into consideration, regardless of the number of
Motor Modules connected in parallel.
Note
Mixed operation is not possible
It is only possible to connect identical power units in parallel if all power units have the same
hardware version. Mixed operation between a power unit with Control Interface Module
(article number 6SL33xx-xxxxx–xAA3) and a power unit with Control Interface Board (article
number 6SL33xx-xxxxx–xAA0) is not possible.
Minimum cable lengths for parallel connection and connection to a motor with a single-winding
system
Note
Minimum cable lengths
The minimum cable lengths specified in the tables below must be observed when two or
more Motor Modules are connected in parallel and there is a connection to a motor with a
single-winding system. If the cable length required for the application cannot be achieved, a
motor reactor must be provided.
Air-cooled chassis power units
Manual, 07/2019, 6SL3097-4AE00-0BP9
Motor Modules
6.6 Technical specifications
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