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Current Sensor Module
Overview
Isolated Hall-effect current sensing with motor load analysis, harmonic content monitoring, and power quality metrics. The module provides galvanically isolated measurement of AC and DC currents, making it safe for retrofit installation on live circuits. On-board computation delivers RMS values, total harmonic distortion, and individual harmonic magnitudes without requiring external analysis software.
Features
- +/-30 A range (others optional) -- Default measurement range covers most industrial motor and drive applications, with alternative ranges available for higher or lower current circuits.
- RMS current, THD, harmonics -- Computes true RMS current, total harmonic distortion up to the 15th harmonic, and individual harmonic magnitudes for power quality assessment.
- Load factor and torque estimation -- Derives motor load percentage and estimated shaft torque from the current waveform, supporting efficiency monitoring without mechanical sensors.
Key Specifications
| Parameter | Value |
|---|---|
| Default range | +/-30 A AC/DC |
| Accuracy | +/-1% of reading |
| Isolation voltage | 2.5 kV RMS |
| Bandwidth | DC - 1 kHz |
| Harmonic analysis | Up to 15th harmonic |
| Sampling rate | 10 kSPS |
| Interface | RS-485 (Modbus RTU) |
| Supply voltage | 5 V (from Edge backplane) |
Applications
- Motor load and efficiency -- Track motor loading over time to identify underloaded or overloaded conditions, optimize energy consumption, and schedule maintenance based on actual duty cycles.
- Pump and fan performance -- Correlate current draw with flow or pressure measurements to detect degraded pump impellers, clogged filters, or slipping fan belts.
- Electrical fault diagnostics -- Detect phase imbalance, ground faults, and winding degradation through harmonic signature analysis and current waveform anomaly detection.
Edge Integration
Streams RMS current, power metrics, and harmonic data to the Edge over RS-485 using Modbus RTU. Alarm thresholds for overcurrent, undercurrent, and harmonic distortion are configurable through the Edge web UI. The module supports auto-discovery on the sensor bus.