Technical Specifications Phase‑CT secondary input:1 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. 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 Certifications: CE, UL
Functional Features Comprehensive motor‑protection functions including overload, locked‑rotor, jam, phase‑unbalance, loss‑phase, ground‑fault and RTD over‑temperature protection. Real‑time motor electrical‑parameter metering capability. RTD‑based motor winding and bearing temperature monitoring. Fault‑event recording and oscillography data storage. User‑programmable internal logic control equations. Modbus RTU communication interface for SCADA‑system connection. Local LCD‑keypad on‑site parameter configuration. Conformal‑coated circuit board resists moisture, dust and trace corrosive gas erosion.
Application Scenarios Chemical‑plant medium‑low‑voltage three‑phase motor protection. Water‑pump station motor‑control‑center equipment. Metallurgical‑factory fan and compressor motor protection. Mine‑site motor‑control‑center protection application points. Harsh‑environment factory conveyor‑belt motor protection 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 pluggable drawer‑type mechanical construction. Front‑panel LCD‑keypad human‑machine‑interface assembly. Rear‑side multi‑pin draw‑out connector for signal‑power interconnection. Drawer‑pull‑handle for convenient maintenance without disconnection of field‑wiring. Metal draw‑out chassis with mechanical‑locking mechanism.
Working Principle Current‑voltage signals are collected from external CT‑VT transformers; temperature signals are acquired from motor‑mounted RTD sensors. Internal micro‑processor executes motor‑protection algorithm logic judgment. When abnormal operating condition is detected, relay‑trip or alarm output signal is triggered. Fault waveform and event records are stored inside non‑volatile memory; real‑time operating data is uploaded via Modbus RTU communication bus.
Installation Requirements Panel‑mount installation inside motor‑control‑center cabinet. Install matched supporting draw‑out base socket unit. Strictly complete CT‑VT‑RTD‑loop wiring according to official wiring diagram. Implement reliable protective‑grounding connection.
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