Block diagram

Operation without a main contactor is not permissible.
The control voltage for the main contactor (or the circuit breaker) must always be routed via terminal XR (connection 109 and 110) of the SINAMICS DC MASTER and via terminal X_CONTACTOR (connections 4 and 5) of the SIMOREG CCP.

For applications with SIMOREG CCP, in the case of a converter or SIMOREG CCP fault, the arrangement must be able to be safely disconnected from the line supply. Further, it must be ensured that the total of the delay times of all of the switching elements in the control circuit must not exceed the time set using the corresponding parameters. When SINAMICS DC MASTER units are connected in parallel, each unit is directly connected to a SIMOREG CCP in parallel (refer to the block diagram for the parallel connection).

Block diagram for parallel connection