GDD360C ABB distributed control system industrial DCS module card

Description

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In addition to providing flexible and safe protection of power
installations, ABB SACE Emax electronic trip units have an extended range of communication features, which opens the way
for connection of circuit-breakers to the world of industrial communication.
PR122 and PR123 electronic trip units can be fitted with communication modules, which make it possible to exchange data
and information with other industrial electronic devices by means
of a network.
The basic communication protocol implemented is Modbus RTU,
a well-known standard of widespread use in industrial automation and power distribution equipment. A Modbus RTU communication interface can be connected immediately and exchange
data with the wide range of industrial devices featuring the same
protocol.
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 immediately available.
The power of industrial networking
The communication network can be used to read all information available in the protection trip
unit, 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 factor
and so on
• alarms and prealarms from protection trip unit, e.g., overload protection alarm (timing to trip or
prealarm 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 trips
per 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 interrupted
currents
Remote control of circuit-breakers is possible: commands to open, close and reset alarms can
be issued to the circuit-breaker and protection trip unit. Close commands are executed only
after 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 the
communication bus.
All remote commands can be disabled by a “local” configuration feature, for safety of operators
and installation.