Sci­en­tific au­to­ma­tion: high mea­sure­ment ac­cu­racy over a large fre­quency range

DEMM Engineering & Manufacturing - - PRODUCT WATCH -

The new EL3773 power mon­i­tor­ing ter­mi­nal for the Beck­hoff EtherCAT I/O sys­tem is de­signed to mon­i­tor the con­di­tion of a three-phase AC or a DC mains net­work. It col­lects in­stan­ta­neous val­ues of power and volt­age at an ex­tremely fast sampling rate of up to 10,000 sam­ples/sec and makes them avail­able to the higher-level PC con­troller for cal­cu­la­tion or anal­y­sis. The in­put chan­nels are trans­ferred via over­sam­pling; this re­sults in the ac­qui­si­tion of ac­tual val­ues with a sig­nif­i­cantly higher res­o­lu­tion in terms of time than the com­mu­ni­ca­tion cy­cle time.

The EtherCAT dis­trib­uted clocks method is used as the ba­sis for the highly pre­cise ac­qui­si­tion of mea­sured val­ues in the EtherCAT Ter­mi­nal sys­tem. Th­ese dis­trib­uted clocks syn­chro­nise the EtherCAT de­vices with very high pre­ci­sion, in­de­pen­dently of the PLC cy­cle. The EL3773 EtherCAT Ter­mi­nal mea­sures volt­age and cur­rent via three chan­nels in each case. The six chan­nels are mea­sured si­mul­ta­ne­ously based on the EtherCAT over­sam­pling prin­ci­ple with a tem­po­ral res­o­lu­tion of up to 100 μs and passed on to the con­troller. The max­i­mum sampling fre­quency for each chan­nel is 10 kHz.

On the ba­sis of the data sup­plied, it is pos­si­ble with the aid of a PC to cal­cu­late true RMS val­ues, power, power fac­tors and fre­quency, and com­plex user-spe­cific al­go­rithms via the volt­age and cur­rent curves. The fast sampling rate also en­ables the mea­sure­ment of volt­age and cur­rent peaks. Us­ing the EL3773 power mon­i­tor­ing ter­mi­nal, in­ter­fer­ence can be de­tected and cor­rected promptly in or­der to avoid dam­age to de­vices, in­creased elec­tric­ity costs and down­time and to op­ti­mally boost the pro­duc­tiv­ity of man­u­fac­tur­ing fa­cil­i­ties.

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