Technical Specifications Phase‑CT secondary‑input:5 A. 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‑inputs. Communication interface: RS485 Modbus RTU. Full‑board conformal‑coating protection. Operating Temperature:‑40 °C to +70 °C Storage Temperature:‑50 °C to +85 °C Relative Humidity:5%‑95%, non‑condensing Mechanical Dimension: Draw‑out drawer‑type panel‑mount unit
Functional Features Complete motor‑protection‑function library: overload, locked‑rotor, jam‑protection, phase‑unbalance, phase‑loss, ground‑fault, RTD‑over‑temperature protection. Real‑time electrical‑parameter metering capability. Fault‑oscillography and event‑recording data storage. User‑programmable‑logic‑control equations. Local‑LCD‑keypad on‑site configuration operation. Modbus‑RTU‑based SCADA‑system communication. Conformal‑coating resists moisture, dust and trace‑corrosive‑gas erosion on circuit‑boards.
Application Scenarios Off‑site remote‑water‑pump‑station motor‑protection. Coastal‑high‑humidity‑atmosphere‑factory motor‑control‑centers. Mine‑site motor‑control‑center protection application points. Chemical‑plant corrosive‑environment motor‑equipment monitoring. Outdoor‑sheltered motor‑control‑cabinet internal protection equipment.
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 drawer‑type plug‑in mechanical‑structure. Front‑panel keypad‑LCD‑human‑machine‑interface assembly. Rear‑side multi‑pin gold‑plated draw‑out‑connector. Drawer‑pull‑handle for maintenance without field‑wiring‑removal. Metal chassis with mechanical‑locking mechanism.
Working Principle Motor‑current‑voltage signals from 5 A‑CT‑VT equipment and motor‑RTD‑temperature‑sensors are sampled continuously. Internal micro‑processor executes protection‑algorithm‑calculation logic. When fault‑condition judgment threshold is satisfied, trip‑alarm‑relay‑output is driven. Fault‑waveform‑and‑event‑logs are stored inside non‑volatile memory; real‑time‑data is transmitted via Modbus‑RTU communication bus to upper‑host‑system.
Installation Requirements Panel‑mount installation inside industrial control‑cabinet. Use supporting matched draw‑out‑base‑socket unit. Strictly implement CT‑VT‑RTD‑loop‑wiring according‑to‑official‑engineering‑drawing. Complete reliable protective‑grounding connection. Set CT‑ratio and motor‑operating‑parameters during commissioning phase.
Usage Notes Confirm field‑CT secondary‑side output is 5 A for P5 variant model. Verify HI‑range control‑power‑supply‑actual voltage value. Avoid scratching conformal‑coating‑protective‑layer during‑maintenance‑operations. Mandatory simulation‑mode‑protection‑test shall be executed before online‑running. Do not pull out draw‑out drawer under live‑circuit working condition.
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