Description
Basic Hardware Information
- Control power supply: Wide range 50‑300 VDC / 60‑265 VAC, max 65 VA power consumption
- Current input: 5 A secondary CT input, true‑RMS sampling mode
- Temperature input: 12‑channel 3‑wire RTD inputs, compatible with Pt100, Ni100, Ni120 and Cu10 sensors for bearing and stator temperature monitoring
- Display: Back‑lit 40‑character LCD screen with local keypad and multi‑LED status indicators
- Mounting: Panel cut‑out mounting for control cabinet installation
- Communication: RS‑485 Modbus‑RTU interface, compatible with EnerVista configuration software
- I/O resources: Multiple configurable digital inputs and relay outputs for trip, alarm and interlock logic
- Operating ambient temperature: ‑40 ℃ ~ +70 ℃; relative humidity 5‑95 % non‑condensing
- Special options: Built‑in metering package supports voltage, kW, kvar, power factor and energy measurement; supports waveform capture and 512‑piece event history storage.
Core Protection & Monitoring Capabilities
It offers comprehensive programmable protection elements: thermal overload with adaptive thermal model, locked‑rotor stall, phase unbalance, phase loss, ground fault, over‑current, under‑current dry‑run detection and start‑up time supervision. Twelve RTD channels collect bearing and winding temperature data to realize over‑temperature alarm and trip. The metering function records complete electrical operating parameters for motor energy analysis. Waveform capture and fault event log store fault timestamp, current snapshot and temperature data, supporting post‑fault root‑cause analysis. All alarm thresholds, time‑delay and thermal curve parameters can be adjusted on‑site according to motor nameplate data. The relay can learn motor actual starting characteristics for optimized protection logicGE Vernova.
On‑site Installation & Commissioning Notes
Install the relay on cabinet panel, keep sufficient separation from high‑current contactors and power cables to reduce electromagnetic interference. CT secondary circuit wiring must be fastened reliably. Never open current transformer secondary circuit under energized status. Complete parameter configuration after wiring: input motor rated current, service factor, locked‑rotor current, starting time and corresponding RTD sensor type. When multiple relays share one Modbus bus, install matching termination resistor at the far‑end of communication cable. Conduct function simulation test before official commissioning, verify trip and alarm action responses are consistent with design requirements.
Common On‑site Abnormal Conditions
‑ Thermal overload trip: Continuous motor over‑load operation, or thermal curve parameters mismatched with motor actual heating characteristics. ‑ Phase unbalance / phase loss alarm: Grid power supply abnormality, loose field terminals or internal motor winding defects. ‑ RTD temperature reading abnormal: Broken or short‑circuited temperature sensor cables, wrong sensor type parameter setting. ‑ Ground fault activation: Motor winding insulation degradation or ground short‑circuit on power cables. ‑ Communication connection failure: Inconsistent Modbus address / baud rate, bus wiring error or missing termination resistor. ‑ Frequent false stall alarm: Improper stall current threshold setting or strong electromagnetic interference from field wiring.
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