Siemens SINAMICS DCM Manual page 563

Descriptions of functions
10.27 Connecting units in parallel and in series
Communication
Note
Before activating the parallel interface (i.e. before setting p51800 > 0), a unique station
address must be set at p51806 on all SINAMICS DCMs. Otherwise, the parallel interface will
not work property.
Remedy in this case: Switch the electronic power supply off and then on.
● In the particular topology, communication between all converters is established via the
parallel interface. The CUDs of all converters should be connected with one another.
● The parallel interface allows a maximum of 16 nodes to communicate.
● The devices are connected using 8-core shielded patch cables, type UTP CAT5
according to ANSI/EIA/TIA 568, such as those that are used to network PCs. A standard
5 m long cable can be directly purchased from Siemens (article number: 6RY1707-
0AA08). (n-1) cables are required to connect n devices. The bus termination must be
activated at the devices at the start of the bus and at the end of the bus (p51805=1).
Note:
A patch cable according to TIA568A (European) or TIA568B (American) can be used.
However, both cable ends must be wired according to the same standard (patch cable =
1:1). A crossover cable is not suitable.
● The parallel interface also enables any BICOs (that can be parameterized by the user) to
be exchanged between nodes. See function diagrams 9352 and 9355. Exchanging data
in this way is not required for closed-loop control of the firing pulses or for generating
them, and is available for the user for any purpose.
Remark: For a 12-pulse series connection, it is not permissible that the parallel interface
is used to transfer BICOs, i.e. p51801 = 0 must be set. Failure to comply with this remark
can result in sporadic current peaks.
● For additional details on how devices are connected in parallel, please refer to function
diagrams 9350, 9352, and 9355.
Controller
• For all of the topologies, a SINAMICS DCM is used as the master converter. The other
converters are called slave converters.
• The control commands - switch-on/stop, operating enable, quick stop, etc. are fed to the
master converter for all topologies.
At the slave converters, terminals 12 and 13 must be permanently connected to terminal
9. If, in spite of this, a control command is entered at a slave converter, then it has the
following consequences:
OFF1
OFF2
564
Has no effect, as long as n<nmin has not been reached, then the
current is reduced to zero at the slave and the slave goes into op-
erating state o7.0 or o7.1
The current is reduced to zero at the slave, then the slave goes into
operating state o10.1 or o10.2
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
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SINAMICS DCM DC Converter