Operation
7.22 Connecting several SINAMICS DCPs in parallel
SINAMICS DCP
410 Operating Instructions, 09/2019, A5E34382853K
Closed-loop voltage control with SINAMICS DCP devices connected in parallel
There are two basic implementation possibilities:
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Variant 1: One DCP is defined as master; this executes the closed-loop voltage control.
It outputs the current setpoint at the voltage controller output to the remaining SINAMICS
DCP (= slaves) via the parallel interface.
These are exclusively operated in the closed-loop current controlled mode using the
setpoint.
Advantage:
The voltage controller in the master controls the voltage precisely to follow the setpoint.
Disadvantage:
The dynamic response of the voltage control is lower than for voltage control by a DCP
alone. This is due to the signal transfer via the parallel interface that involves a dead time
of approximately 2 ms in the control loop. This dead time is independent of the number of
devices connected in parallel, which means that this variant only functions if a large
capacitance is available on the voltage-controlled side.
Example
Figure 7-99 Controller structure of the voltage control for variant 1
For this example, the DCP devices must be connected via parallel interface X165/X166.
The two interfaces are connected in parallel internally. This means that the connecting
cable can be connected to any of the two connectors.
Further, DCP1 should be configured as master (p51800 = 10) and DCP2 as slave
(p51800 = 11).
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