Description

The BECKHOFF EL3443 is a 3-channel analog input EtherCAT Terminal optimized for precise 3-phase power measurement and mains analysis. Capable of handling voltages up to 480 V AC/DC and currents up to 1 A AC/DC directly or via measuring transformers, it delivers precise data acquisition with 24-bit resolution. This terminal functions as a comprehensive tool for monitoring energy usage, calculating electrical performance metrics, and assessing overall power grid quality.

Beyond basic current and voltage measurements, the BECKHOFF EL3443 calculates active, reactive, and apparent power, as well as active, reactive, and apparent energy. Additional diagnostic values include the phase angle (cos phi), frequency, Total Harmonic Distortion (THD), and individual harmonics up to the 40th harmonic. These integrated capabilities enable complete grid and load tracking without the need for auxiliary measuring instruments.

For system safety and communication integrity, the terminal features 2500 V electrical isolation between the field-side measurement circuits and the internal E-bus. Integrated monitoring functions cover phase order, phase failure, phase asymmetry, and configurable undervoltage or overvoltage thresholds. Precise zero-voltage crossing detection is also featured for applications demanding accurate synchronization.

Features

• 3-phase power measurement for AC and DC industrial grids
• Direct voltage measurement up to 480 V AC 3-phase (line-to-neutral up to 277 V AC or 240 V DC)
• Current measurement up to 1 A AC/DC, optimized for standard current transformers
• High-resolution 24-bit analog-to-digital signal conversion
• Calculates active, reactive, and apparent power/energy, THD, and harmonics up to the 40th
• Integrated diagnostic monitoring for phase failure, phase order, asymmetry, and over/undervoltage
• Highly precise zero-crossing detection for voltage signals
• Electrical isolation of 2500 V to protect downstream EtherCAT devices

Applications

• Industrial energy management and sub-metering systems
• Mains quality monitoring and harmonic analysis in production plants
• Condition monitoring and load analysis of electrical drives and motors
• Power profiling and peak-shaving optimization in automation networks

Technical Specifications

General

Electrical Data

Communication and Power

Mechanical and Connection

Environmental

Installation Guidelines

1. Ensure the entire industrial control cabinet is fully de-energized before mounting, wiring, or configuring the system.
2. Inspect the BECKHOFF EL3443 housing and spring-clamp connectors for visual damage prior to mounting.
3. Mount the terminal onto a standard 35 mm DIN rail (EN 60715) by snapping it into place until the locking mechanism engages securely.
4. Ensure proper side-by-side alignment, establishing reliable E-bus contacts and power contact connections with adjacent EtherCAT Terminals.
5. Connect the voltage and current transformer wiring to the designated spring-clamp connection points, matching Phase L1, L2, and L3 configurations carefully.
6. Configure the terminal parameters (such as transformer ratio settings and monitoring limits) inside TwinCAT System Manager before initiating system startup.