Mt3021 Manual Verified -

A (Figure 5‑4) clarifies dependencies; for example, changing Rated Current automatically updates Current Limit and Thermal Protection thresholds.

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| Code | Meaning | |------|---------| | E-01 | Overload (> range) | | E-02 | Open thermocouple | | E-03 | Calibration data corrupt | A (Figure 5‑4) clarifies dependencies

| Connection | Recommended Cable | Max Length | Notes | |------------|-------------------|------------|-------| | Input L1‑L3 | 4 mm² (copper) THHN | 30 m (single‑phase) | Fuse per phase (10 % above rated current) | | Input Earth | 2.5 mm² green/yellow | 30 m | Continuous connection to earth bar | | Output U‑V‑W | 6 mm² (copper) for 22 kW | 15 m | Use twisted pair, shielded for high‑frequency noise | | Control (Modbus‑RTU) | 0.6 mm² stranded | 100 m | Terminate with 120 Ω at each end | | CANopen | 0.5 mm² twisted pair | 40 m | 120 Ω termination at both ends | mt3021 manual

Adjust temperature and humidity levels from a centralized interface.