ABB REX 521 Technical Reference Manual, Standard Configurations page 112

REX 521 Protection Relay 1MRS 751802-MUM
Technical Reference Manual, Standard Configurations
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In this application example the open and close push buttons are connected to the
digital inputs DI7 and DI8. Normally these buttons are connected directly to the
open or close circuits of the breaker. By including these to the relay, it is possible to
monitor the whole opening and closing time of the breaker and it is also possible to
define the pulse width for the open and close pulse. The manual opening and closing
via push buttons are also disabled when the relay is set to remote mode, and vice
versa when the relay is in local mode, the remote control is disabled. If the breaker
is interlocked and the interlocking scheme is used with one or more digital inputs
configured to the "CLOSEENA" input signal, no close pulse will be sent from the
relay. The open and close input signals have to be selected via the
Configuration\Input Signals\ menu in the same way as for the breaker
status indication signals.
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