Additional Drive In Addition To The Parallel Connection - Siemens SINAMICS S120 Function Manual

8.10.3

Additional drive in addition to the parallel connection

Frequently, a controlled auxiliary drive is required in addition to the main drives, e.g. as
excitation controller for shaft-mounted generators in shipbuilding or as lubricating pump
drive, fan drive etc.
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
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
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
8.10 Parallel connection of power units
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