Emax Low voltage air circuit-breakers - ABB Download Center

Communication devices and systems4Industrial networking and ABB SACE EmaxIn addition to providing flexible and safe protection of powerinstallations, ABB SACE Emax electronic trip units have an extendedrange of communication features, which opens the wayfor connection of circuit-breakers to the world of industrial communication.PR122 and PR123 electronic trip units can be fitted with communicationmodules, which make it possible to exchange dataand information with other industrial electronic devices by meansof a network.The basic communication protocol implemented is Modbus RTU,a well-known standard of widespread use in industrial automationand power distribution equipment. A Modbus RTU communicationinterface can be connected immediately and exchangedata with the wide range of industrial devices featuring the sameprotocol.ABB products featuring the Modbus RTU protocol include:• low voltage circuit breakers such as Emax,• Medium Voltage protection devices• sensors,• automation I/O systems,• power meters and other measurement devices,• intelligent devices such as PLCs,• operator interfaces• supervision and control systems.And if other communication protocols are required, the ABB Fieldbus Plug system is also available:intelligent field bus protocols such as Profibus-DP and DeviceNet thus become immediatelyavailable.1SDC200303F0001The power of industrial networkingThe communication network can be used to read all information available in the protection tripunit, from any location connected to the bus and in real time:• circuit-breaker status: closed, open, opened by protection trip unit trip• all values measured by the protection trip unit: RMS currents, voltages, power, power factorand so on• alarms and prealarms from protection trip unit, e.g., overload protection alarm (timing to trip orprealarm warning)• fault currents in case of circuit-breaker opening on a protection trip• number of operations performed by the circuit-breaker, with indication of the number of tripsper protection type (short-circuit, overload, etc.)• complete settings of the protection trip unit• estimate of the residual life of circuit-breaker contacts, calculated on the basis of interruptedcurrentsRemote control of circuit-breakers is possible: commands to open, close and reset alarms canbe issued to the circuit-breaker and protection trip unit. Close commands are executed onlyafter a security check (e.g., that there are no diagnostic alarms active on the trip unit).It is also possible to change the settings of the protection trip unit remotely by means of thecommunication bus.All remote commands can be disabled by a “local” configuration feature, for safety of operatorsand installation.4/40ABB SACE