Siemens Sinamics S120 Function Manual page 415

For drive units with power units connected in parallel (Line Modules, Motor Modules) an
additional drive can be supplied as an auxiliary drive. This drive object is supplied via a
separate Motor Module from the common DC link and controlled from the CU320-2 via a
dedicated DRIVE-CLiQ socket.
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
● 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
● Parameter p9620 (signal source for STO/SBC/SS1) of the DOs of all Motor Modules must
● Automatic commissioning of the additional drive object is not possible.
● The additional drive object must be created offline and then transferred online to the
● 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
● Existing supplementary conditions and the resulting logic operations and monitoring
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
● The auxiliary drive is assigned a separate DRIVE-CLiQ line.
● The DRIVE-CLiQ connections must be implemented corresponding to the topology that
Example of the required topology
You can see an example created with STARTER below. 3 Basic Line Modules, 2 Motor
Modules and an auxiliary drive are configured. The parallel connections can be clearly seen
in the topology tree as one infeed and one drive. You can also see the additional auxiliary
drive. The DRIVE-CLiQ connections are shown as a thin line. The three parallel Line
Modules are connected to one DRIVE-CLiQ line, the two Motor Modules to the next DRIVE-
CLiQ line, and the auxiliary drive to a third line.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
in parallel.
separate DRIVE-CLiQ sockets. Mixed operation at one DRIVE-CLiQ socket results in a
malfunction.
be interconnected in the same way.
drive.
of all the Motor Modules incl. the additional drive - does not exceed the total power rating
of the parallel Line Modules.
functions must be adapted to the new requirements.
Motor Module.
has been created
Function modules
7.11 Parallel connection of power units
413