Siemens SINAMICS S120 Function Manual page 319

Figure 7-21
Even SMI motors can be connected in parallel. The first motor is connected to DRIVE-CLiQ
via the encoder. The other motors in the connection are of an identical type. Using
parameter p0306 and the encoder information obtained via DRIVE-CLiQ, it is possible to
determine all the necessary motor data.
Properties of the parallel connection in STARTER
● The rating plate and equivalent circuit diagram parameters are those of the single drive.
● The parallel data set has no code numbers. All motor data are calculated from p0306 and
● The "Motor data" screen still displays only the data for the individual motor selected.
Restrictions applicable to parallel connections
The basic governing principle of parallel connections is that the motors involved are
mechanically inter-coupled via the load. Where motors need to be decoupled from the
connection, the number of motors need to be reduced in p0306 by a DDS/MDS switchover.
Since the equivalent circuit diagram changes as a result, it may be necessary to commission
these data sets separately (e.g. motor data identification with reduced number of motors).
The power unit will otherwise apply false motor data.
An EDS switchover and e.g. 2 SMCs must be used in cases where a motor with encoder
needs to be decoupled from connections operating with encoder.
Vector control with encoder for parallel-connected drives functions in the same way as for a
single drive if the drives are coupled via the load and the speeds do not differ by more than
the working-point-dependent pull-out slip.
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Selection of motors for parallel connection
the code numbers of individual motors. The same interlock mechanisms apply as to
single drives.
Function modules
7.10 Connecting the motors in parallel
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