Technical Specifications Phase‑CT secondary input:5 A. High‑range control‑power supply:70‑265 VAC /90‑300 VDC. 4‑channels isolated 4‑20 mA analog outputs. 9 opto‑isolated digital inputs. 4 Form‑C relay outputs. 6‑channel RTD temperature‑sensor inputs. Communication interface: RS485 Modbus RTU. Back‑lit LCD display. Operating Temperature:‑20 °C to +70 °C Storage Temperature:‑40 °C to +85 °C Relative Humidity:5%‑95%, non‑condensing Mechanical Dimension: Draw‑out drawer‑type panel‑mount unit
Functional Features Full‑set motor‑protection functions including overload, locked‑rotor, motor‑jam, phase‑unbalance, phase‑loss, ground‑fault and RTD‑detected over‑temperature protection. Real‑time motor electrical‑parameter metering capability. Fault‑event recording and fault‑oscillography data storage. User‑programmable internal logic equation control. Local keypad‑based on‑site parameter setting. Upload real‑time data to SCADA‑system via Modbus RTU protocol.
Application Scenarios General‑purpose industrial‑plant motor‑control‑centers. Water‑treatment‑plant pump‑and‑fan‑motor protection. Chemical‑factory auxiliary‑motor‑equipment monitoring sites. Manufacturing‑production‑line motor‑protection control‑systems.
Performance Parameters Current‑measurement accuracy: ±1%. Voltage‑measurement accuracy: ±0.5%. Analog‑output accuracy: ±0.5% full scale. Relay contact resistive rating:250 VAC /5 A.
Structural Characteristics Draw‑out plug‑in drawer‑type mechanical construction. Front‑panel LCD‑keypad human‑machine‑interface assembly. Rear‑side multi‑pin gold‑plated draw‑out‑connector. Drawer‑pull‑handle for convenient maintenance without dismounting field‑wiring. Metal chassis with mechanical‑locking mechanism.
Working Principle Current‑voltage signals are acquired from 5 A‑rated current‑transformers and voltage‑transformers; temperature signals are collected from motor‑mounted RTD sensors. Internal micro‑processor executes motor‑protection‑algorithm calculation. When fault‑judgment condition is satisfied, trip‑alarm‑relay‑output is triggered. Fault‑waveform‑and‑event‑data are stored; real‑time data is exchanged with upper‑level‑host‑system via Modbus RTU bus.
Installation Requirements Panel‑mount installation inside motor‑control‑center cabinet. Install matched draw‑out base socket unit. Strictly follow CT‑VT‑RTD‑loop‑wiring official schematic drawing. Implement reliable protective‑grounding connection. Set CT‑ratio and motor‑nameplate‑parameters during commissioning work.
Usage Notes Confirm field‑CT secondary‑side output is 5 A for P5‑model variant. Verify control‑power‑supply voltage matches HI‑range specification. Perform protection‑logic simulation‑test before formal online‑operation. Avoid excessive condensation phenomenon inside installation cabinet environment. Do not pull out draw‑out drawer under live‑circuit condition.
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