Beckhoff EL3773, Documentation

Page: 138 / 179

Commissioning
EL3773 138 Version: 2.5
◦ RMS voltage of the external conductors
◦ Apparent, active and reactive power for each channel and in total
◦ Power factor (cos φ) for each phase
◦ Frequency of each voltage channel
The following list shows an overview of the calculation of the values. More details in the item "Performance
of the calculations"
Fig. 154: Overview of the performance of the calculations
• The calculations can be switched on and off for each individual channel
• On the basis of the supplied time stamp of the next sample, all other samples are provided with 64 bit
DC time stamps; these are necessary for determining the frequency
• Default values are passed on in case of invalid input data; the error which occurred is displayed in the
visualization
Connection diagram:
• The wiring is done as described in the chapter Application examples for AC [ } 102]
• The voltage is measured via connections L1, L2, L3 and N.
• The current is measured via three current transformers [ } 123] and the connections I
L1
, I
L2
, I
L3
and I
N
(star point of the current transformers).
The program serves as an initial introduction to the options for evaluating the data from a mains monitoring
terminal. The user is free to change the program to suit his ideas or to use only part of the code.