Technical Specifications Three‑phase current measurement inputs, multiple digital input channels, relay output contacts, built‑in communication interface. Integrated motor thermal overload calculation model. Operating ambient temperature ‑20 ℃ to +65 ℃, storage temperature ‑40 ℃ to +85 ℃, relative humidity 5%‑95% non‑condensing. Equipped with front‑panel LCD display and operation keypad. Panel‑mount installation structure.
Functional Features Provides overload, locked‑rotor, phase loss, phase unbalance, ground fault, jam and over‑current protection functions. Captures motor start‑up records and fault snapshot data. Measures real‑time three‑phase current values. Supports local manual operation and remote control commands through communication bus. Configurable alarm and trip output contacts. Compatible with external RTD temperature sensor expansion. Stores historical event logs for post‑failure analysis.
Application Scenarios Applied for protection and status monitoring of pumps, fans, compressors and conveyors. Widely deployed in power plant auxiliary systems, chemical processing plants, water treatment facilities and industrial motor control centers.
Performance Parameters High‑precision current sampling, adjustable protection time‑delay curves, large‑capacity event memory, stable fieldbus data exchange performance.
Material Composition Flame‑retardant engineering plastic enclosure. Main CPU processing board, analog signal conditioning circuit, electromagnetic relay assemblies. Front‑panel human‑machine interface module. Screw‑type field wiring terminal blocks. Metal mounting clip hardware.
Structural Characteristics Standard panel‑mount rectangular housing. Front panel integrates LCD screen, status LED indicators and setting push‑buttons. Rear section concentrates all field wiring terminals for CT signals, digital I/O and communication ports.
Working Principle Current signals from external current transformers feed into relay measurement terminals. Internal processor continuously samples electrical parameters and calculates motor thermal accumulation.
Installation Requirements Apply auxiliary power supply, input motor nameplate parameters and configure protection setting values, complete functional verification test.
Usage Notes CT secondary circuit must not operate under open‑circuit condition. Protection setting parameters shall match actual motor specifications. Use shielded cables for communication wiring.
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