Connection Diagrams - ABB RELION SMU615 Applications Manual

Merging unit variants
3.1.2 Addition of control functions for primary devices and the
use of binary inputs and outputs
If extra control functions intended for controllable primary devices are added to the
configuration, additional binary inputs and/or outputs are needed to complement
the standard configuration.
If the number of inputs and/or outputs in a standard configuration is not sufficient,
it is possible either to modify the chosen standard configuration in order to release
some binary inputs or binary outputs which have originally been configured for
other purposes, or to integrate an external input/output module, for example
RIO600, to the merging unit.
The external I/O module's binary inputs and outputs can be used for the less
time-critical binary signals of the application. The integration enables releasing
some initially reserved binary inputs and outputs of the merging unit's standard
configuration.
The suitability of the merging unit's binary outputs which have been selected for
primary device control should be carefully verified, for example make and carry and
breaking capacity. If the requirements for the primary device control circuit are not
met, using external auxiliary relays should be considered.
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SMU615
Application Manual