Siemens SINAMICS S120 Function Manual page 572

Function modules
8.10 Parallel connection of power units
Conditions for switching in an auxiliary drive
The secondary conditions for connecting an additional drive object as auxiliary drive to a
parallel connection are:
● Only power units of the same type and the same power rating may be connected together
in parallel.
● Up to 4 Line Modules and up to 4 Motor Modules can be connected together in parallel.
● All the Power Modules operate on a common DC link.
● Due to the different cycle times, Line Modules and Motor Modules must be connected to
separate DRIVE-CLiQ sockets. Mixed operation at one DRIVE-CLiQ socket results in a
malfunction.
● Parameter p9620 (signal source for STO/SBC/SS1) of the DOs of all Motor Modules must
be interconnected in the same way.
● Automatic commissioning of the additional drive object is not possible.
● The additional drive object must be created offline and then transferred online to the
drive.
● The additional drive object must be connected to a separate DRIVE-CLiQ socket.
● The maximum power of the auxiliary drive must be selected so that the maximum power
of all the Motor Modules incl. the additional drive - does not exceed the total power rating
of the parallel Line Modules.
● Existing supplementary conditions and the resulting logic operations and monitoring
functions must be adapted to the new requirements.
Creating a project with the appropriate topology
The required topology can be created using either the STARTER or SCOUT tool:
● The project is always created offline.
● The Control Unit combines parallel-connected power units to form a large Line Module or
Motor Module.
● The auxiliary drive is assigned a separate DRIVE-CLiQ line.
● The DRIVE-CLiQ connections must be implemented corresponding to the topology that
has been created
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions