Siemens SINAMICS S120 Function Manual page 322

Function modules
7.11 Parallel connection of power units
● Parallel connection of up to four power units on the infeed side (closed/open loop).
● A Control Unit which controls and monitors parallel connections of power units at the
● Redundant operation:
● The power units connected in parallel must be connected to the same Control Unit.
● With a CU320, a maximum of one parallel connection on the line side and one parallel
● Components at the line and motor ends for decoupling the parallel-connected power units
● Simple commissioning, because no special parameterization is necessary.
● Individual power units can be parameterized and diagnosed (troubleshooting) with p7000
The following S120 Modules can be connected in parallel:
● Basic Line Modules, 6-pulse and 12-pulse (each with the relevant line reactors)
● Smart Line Modules, 6-pulse and 12-pulse (each with the relevant line reactors)
● Active Line Modules, 6-pulse and 12-pulse (each with the relevant Active Interface
● Motor Modules (in vector control mode)
A slight current reduction of a few per cent below the rated current must be taken into
account when parallel connections of power units are configured.
The current reduction (derating) from the rated value of the individual modules is as follows:
● 7.5 % for parallel connections of S120 Basic Line Modules and S120 Smart Line Modules
● 5.0 % for parallel connections of S120 Active Line Modules and S120 Motor Modules
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infeed and motor ends. In this case, the Control Unit is not capable of controlling any
motor or vector axes in addition to the parallel connections.
Two Control Units which control and monitor parallel connections of power units at the
infeed and motor ends. In this case, the Control Units are not capable of controlling any
motor or vector axes in addition to the parallel connections.
connection on the infeed side can be implemented.
and for ensuring symmetrical current distribution.
ff.
Modules)
when neither module is equipped with a current compensation control.
when each module is equipped with a current compensation control.
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions