Siemens SINAMICS G130 Engineering Manual page 114

Fundamental Principles and System Description
Engineering Information
Redundant line supply concepts with the SINAMICS Smart Infeed
With the line-commutated unregulated SINAMICS Smart Infeed only variant 2 can be used.
Variant 2 with SINAMICS Smart Infeed, boundary conditions to be observed:
·
Each Smart Line Module requires a line reactor with a short-circuit voltage of 4 %.
·
If the three-winding transformer corresponds to the specification in the section "Transformers", subsection
"Three-winding transformers", and it can be accepted that the common DC link is operating with half the
power when a Smart Line Module fails, each Smart Line Module can be selected for half the input current
taking into account a current derating of 7.5 % related to the rated current, as with the 12-pulse, parallel
connection of Smart Line Modules. If the full infeed power is required when a Smart Line Module fails, each
of the two Smart Line Modules and their associated transformer windings must be dimensioned in line with
the full power required for the DC link.
·
Each Smart Line Module must be able to precharge the complete common DC link capacitance.
Redundant line supply concepts with SINAMICS Active Infeed (master-slave configuration)
The regulated SINAMICS Active Infeed allows variants 2 and 3 to be realized. The individual Active Infeeds, which
comprise an Active Interface Module AIM and an Active Line Module ALM, must be configured and set up so that
they are completely autonomous. They must operat in master-slave configuration. An autonomous setup means:
·
Each Active Infeed must have its own Control Unit.
·
The Control Unit of each Active Infeed must control only the assigned Active Infeed but not any additional
Motor Modules.
·
Due to the need for redundancy, the Motor Modules operating on the common DC link must be operated on
a separate Control Unit or multiple separate Control Units in complete independence of the Infeed Modules.
The master Infeed is operating in voltage control mode and regulates the DC link voltage V
slave Infeed(s) is/are operating in current control mode, whereby one master Infeed is required and not more than 3
slave Infeeds are permissible.
The current setpoint can be transferred from the master Infeed to the slave Infeed(s) by various different methods: In
systems with a higher-level controller, e.g. by PROFIBUS DP slave-to-slave communication, or in systems without a
higher-level controller via SINAMICS Link using CBE20 Communication Boards or through analog channels using
TM31 Terminal Modules. For further details about communication and parameterization, please refer to the function
manual "SINAMICS S120 Drive Functions".
If a slave Infeed fails, the master Infeed and any other slave Infeed will continue operation. If a master Infeed fails, a
slave Infeed must switch over from slave operation in current control mode to master operation in voltage control
mode. This can be done during operation (i.e. without the need for any downtime).
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Ó Siemens AG
of the DC link, while the
DC