Overview

Beckhoff offers various terminals for implementing supply network 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 TC3 Power Monitoring function is a PLC library for evaluating raw current and voltage data provided by the 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 network 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.