Connecting The Motors In Parallel - Siemens SINAMICS S120 Function Manual

7.27

Connecting the motors in parallel

For simple commissioning of group drives (a number of identical motors operating on one
power unit), the number of parallel-connected motors can be entered via STARTER (only for
vector control) or via the expert list (for servo and vector control) (p0306).
An equivalent motor is computed internally depending on the number of motors specified.
The motor data identification determines the data for an equivalent motor. Motors connected
in parallel can also operate on an encoder (on the 1st motor).
Note
For information about parallel connection of Motor Modules, see Section "Parallel connection
of power units (Page 519)".
Features
● Up to 50 motors connected in parallel can be operated on one frequency converter.
● The original motor data set (p0300 ff.) is not modified. It is merely the data set transfer to
● The stationary motor data identification also works for parallel connections.
● The rotating measurement function also works if the motors can rotate without distance
● The cable lengths for motors connected in parallel must be as symmetrical as possible to
● Motors connected in parallel with servo control, must be individually thermally monitored.
Commissioning via STARTER for vector control
Note
Motors with servo control can only be connected in parallel via the expert list.
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
the closed-loop control which is organized according to the number of parallel-connected
motors.
limit. Uneven loading of the motors or a high degree of gear backlash will negatively
affect the accuracy of the rotating measurement result.
afford the most even possible distribution of current among individual motors.
Synchronous motors connected in parallel must have the same EMF so that no unwanted
currents flow between the motors.
7.27 Connecting the motors in parallel
Basic functions
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