Parallel Connection Of Motor Modules - Siemens SINAMICS S120 Function Manual

Function modules
8.10 Parallel connection of power units
6-pulse, redundant parallel connection of Active Line Modules with multiple Control Units
For a description of parallel connections of multiple Active Line Modules under the control of
separate Control Units, please refer to section "Master/slave function for Active Infeed
(Page 509)".
12-pulse parallel connection of Active Line Modules
The 12-pulse parallel connection can operate in master-slave mode (section "Master/slave
function for Active Infeed (Page 509)").
Modules with different ratings can be included in the connection (as in the case of 6-pulse
master-slave operation).
8.10.1.4

Parallel connection of Motor Modules

Up to four Motor Modules operating in parallel can supply a single motor in vector control.
The motor can have electrically isolated winding systems or a common winding system. The
type of winding system defines the following requirements:
● The required decoupling measures at the outputs of the Motor Modules connected in
parallel
● The possible modulation systems to generate pulse patterns
In conjunction with the type of infeed, the modulation systems define the maximum
attainable output voltage or the maximum attainable motor voltage.
Winding systems for motors in SINAMICS parallel connections
The following are admissible:
● Motors with electrically isolated winding systems (multi-winding system) in which the
individual systems are not electrically coupled.
● Motors with a common winding system (single winding system) in which all parallel
windings in the motor are interconnected in such a way that from the outside they look
like a single winding system.
The following are inadmissible:
● Motors with separate winding systems on the line side which have a common, internal
neutral.
Below are two examples illustrating the possible configuration of parallel connections of
motors with a two-winding system or single winding system.
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Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions