Siemens SINAMICS DCM Manual page 565

Descriptions of functions
10.27 Connecting units in parallel and in series
10.27.1 6-pulse parallel connection
Topology
Basic topology
The topology of a 6-pulse parallel connection, comprising a master converter and two slave
converters is shown in the following diagram.
1) The same phase sequence is required between 1U1/1V1/1W1.
2) The same phase sequence is required between 1C1/1D1.
3) The devices are connected using (8-pin) shielded patch cables of type UTP CAT5 in acc. with ANSI/EIA/TIA 568,
such as those that are used in PC network technology.
A standard, 5 m cable can be obtained directly from Siemens (article number: 6RY1707-0AA08).
(n-1) cables are required for connecting n devices in parallel.
The bus terminator must be activated for each device positioned at the start or end of the bus (p51805 = 1).
4) These fuses may only be used with devices up to 850 A.
5) Only with devices up to 850 A during 4Q operation.
Figure 10-78 Connecting the devices in parallel
● Up to six devices can be connected in parallel.
● When connecting several devices in parallel, the master device should be positioned
centrally due to the signal runtimes. Maximum cable length of the parallel-connection
interface cable between master and slave devices at each bus end: 15 m.
● Separate line reactors of the same type are required for each device for current splitting
purposes. The difference in reactor tolerances determines the current splitting. For
operation without derating (current reduction), a tolerance of 5% or less is recommended.
566
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
ac.maher.co.ir
SINAMICS DCM DC Converter