Parallel Connection Of Motor Modules - Siemens SINAMICS S120 Function Manual

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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 infeeds".

12-pulse parallel connection of Active Line Modules

The 12-pulse parallel connection can operate in master-slave mode (section "Master/slave

function for infeeds").

Modules with different ratings can be included in the connection (as in the case of 6-pulse

master-slave operation).

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

● 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

● Motors with a common winding system (single winding system) in which all parallel

The following are inadmissible:

● Motors with separate winding systems on the line side which have a common, internal

Below are two examples illustrating the possible configuration of parallel connections of

motors with a two-winding system or single winding system.

Drive functions

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

individual systems are not electrically coupled.

windings in the motor are interconnected in such a way that from the outside they look

like a single winding system.

Function modules

7.10 Parallel connection of power units