EL3433 Beckhoff
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The Beckhoff EL3433 is part of the EL EtherCAT Terminals series and provides 4 current and 3 voltage input channels. The terminal measures up to 500 V AC three-phase voltage and 10 A AC current with a voltage resolution of 0.1 mV and a current resolution of 1 microampere. It features a 16,800 samples per second sampling rate and achieves power accuracy up to 1%.
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Product Description:
The EL3433 is a power-measurement EtherCAT terminal manufactured by Beckhoff within the EL EtherCAT Terminals series. Mounted on a DIN rail with other bus couplers, it captures real-time current and voltage data from three-phase supplies and delivers calculated power information to the PLC, enabling energy monitoring and process diagnostics in industrial automation systems. By tracking phase-resolved power continuously, the device supports load balancing and efficiency analysis across machines. The terminal can also pass measurement trends to supervisory software for alarms, logging, and long-term energy studies without requiring a separate meter at each load point.
The terminal offers four current and three voltage channels whose inputs are sampled simultaneously at 16,800 samples/s, preserving phase alignment for power factor calculations. Current values are digitized with 1 µA resolution, while voltage readings attain 0.1 mV resolution, allowing precise observation of small load shifts. Measurement ranges reach 500 V AC on the voltage side and 10 A AC on each current path, accommodating direct wiring for branch circuits or instrument transformer secondaries. Internally, voltage inputs present 1 MΩ resistance, and current inputs load the line with less than 3 mΩ, so measurement hardware introduces minimal disturbance. Sampled data feed the power engine, which reports active, reactive, and apparent power with a granularity of 10 mW. This arrangement helps the controller compare phase relationships during changing loads without reconstructing values from offset samples.
Results are refreshed every 200 ms, and overall power accuracy stays within 1%. Individual voltage and current magnitudes observe a tighter 0.5% Full Scale tolerance, aided by the module’s single-ended ground reference and its simultaneous-sampling architecture. During operation, the EtherCAT backplane provides 200 mA of supply current, so no external auxiliary power is required. The fixed update interval combines with the 4-current and 3-voltage channel mix to give deterministic energy data for controllers that must supervise load profiles, detect imbalance, or trigger condition-based maintenance routines. That behavior is useful when the PLC must react to imbalance events or sustained demand changes with predictable timing.
Frequently Asked Questions about EL3433:
Q: What are the maximum measurable current and voltage on the Beckhoff EL3433 EtherCAT terminal?
A: The EL3433 can measure up to 10 A AC for current and up to 500 V AC 3-phase for voltage.
Q: How many input channels are available on the EL3433 terminal?
A: There are four current input channels and three voltage input channels on the EL3433.
Q: What sample rate does the EL3433 EtherCAT terminal support?
A: The EL3433 achieves a sample rate of 16,800 samples per second.
Q: What is the power measurement accuracy of the EL3433?
A: The EL3433 provides a power measurement accuracy of 1%.
Q: What is the voltage resolution offered by the EL3433 EtherCAT terminal?
A: The voltage resolution on the EL3433 terminal is 0.1 mV.
