Operator Interfaces, Switches & Relays


MA relay gains Profibus approval

September 2009 Operator Interfaces, Switches & Relays

NewElec’s locally designed and manufactured MA motor protection relays with Profibus communications have been certified and tested successfully at Procentec in the Netherlands.

Equipped with four output contacts, two of which may be programmed, the MA relay has five digital inputs accepting a field supply of 24 to 220 VAC or DC and may also be expanded for fieldbus communications by means of the Profibus DP Modbus RTU or Canbus protocols communications modules.

Additional features, such as actual load current, thermal capacity available in motor, alarm and trip flags for all fault conditions, running hours counter, time and date stamping of last four faults, can be extracted through Profibus DP communications.

All configuration and parameterisation of the MA relay on Profibus DP is done using the PLC vendor configuration and parameterisation software. This incorporates the MA’s GSD file into the vendor PLC device library to identify all the features of the MA relay to the specific PLC or scada system under Profibus DP.

The NewElec MA motor-protection relay, through an RS232 port running NewElec propriety free-issue software, is able to record the three-phase currents, line voltage and phase voltage at one-second intervals. The resultant text file is exported to Excel for analysis, with a typical file size of 7 MB for a 24 hour reporting period. This feature has proved invaluable in monitoring load currents in mining equipment in flameproof enclosures, allowing the identification of load-related problems that have been plaguing the operation and engineering staff in the coal-mining industry.

For more information contact Luc Dutrieux, NewElec, +27 (0)12 327 1729, sales@newelec.co.za, www.newelec.co.za



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