Power Monitoring

Beckhoff offers various terminals for implementing power grid analysis and monitoring in its I/O portfolio. In a single- or three-phase grid, power measurement terminals such as the EL3403 or EL3413 directly provide RMS values for current and voltage, as well as active, reactive, and apparent power. The EL3773 and EL3783 power monitoring terminals can also be used to log the raw data for current and voltage, so that grid events can be detected even more accurately, and various values can be calculated in the controller itself.

The power monitoring algorithms of the TwinCAT Analytics Engineering Tools originate from the PLC library TF3650 Power Monitoring.

A PLC library for evaluating raw current and voltage data provided by power monitoring terminals.

The library provides function blocks for calculating RMS values for current, voltage, and power. These can be output as instantaneous or average values. The function block also offers maximum and minimum values. Frequency and frequency spectra can be determined, such as e.g., harmonics in the grid and their load in the form of the Total Harmonic Distortion (THD). Furthermore, the library offers function blocks which can be used to determine frequencies and rotary fields.