Beckhoff EL3773, Документация, Страница: 17 / 179

Product overview
EL3773 17 Version: 2.5
• The voltage and current curve can have any form; the EL3773 is thus suitable for AC and DC
measurements
• various filter functions (low-pass and notch filter) are available for each channel
• the EL3773 can be synchronized with other EtherCAT device over Distributed Clocks, but can also be
operated without Distributed Clocks with oversampling
• no pre-evaluations or calculations of the amplitude values take place in the EL3773
Hence, the EL3773 is suitable for very different applications, for example
• 3-phase monitoring: the voltage and current to N are measured for a 3-phase load
• 3-load monitoring: the voltage and current to N can be measured for 3 loads even if connected to the
same phase
• each channel can measure as desired, provided the measured is referred to N (or GND in DC
networks)
• Measurement of non-sinusoidal amplitude curves, including rectangular or DC curves
Evaluations and calculations of the raw data sent to the controller, such as active power (P), cumulative
power consumption (W) or power factor (cos φ) must take place in the controller. The controller has sufficient
computing power for true RMS or performance calculation and complex custom algorithms based on the
measured voltages and currents.
Note
Design of voltage measuring range
Low-voltage power supply systems are defined, for example, in IEC 60038. Since 2003 the
specification here is 230/400 V
RMS
±10%, corresponding to ±357 V
peak
. So that substantial
spikes can also be measured, the EL3773 supports a measuring range of 288 V
RMS
AC,
corresponding to ±407 V
peak
(nominal: ±410 V).
3.4 Start
For commissioning:
• Install the EL3773 as described in section Mounting and wiring [
}
29] .
• configure the EL3773 in TwinCAT as described in the chapter Commissioning [ } 42] .