GE 369-HI-R-0-0-E-0-E Multilin Motor Management Relay

Description

Basic Hardware Information

• Power supply: Wide‑range 100‑250 VAC / 100‑250 VDC universal input
• Current input: Designed for external 5 A secondary current transformers, CT hardware not integrated on unit
• Display: Back‑lit 40‑character LCD screen plus multi‑channel LED status indicators; local keypad for parameter setup and data browsing
• Mounting style: Rack‑mount form factor, fits standard control cabinet installation
• Communication: RS‑485 physical interface, supports Modbus‑RTU protocol for connecting to PLC, DCS and SCADA host systems
• I/O allocation: Configurable digital input and relay output contacts for external interlock, alarm and trip commands
• Operating ambient temperature: ‑40 ℃ ~ +70 ℃; humidity 5‑95 % non‑condensing
• Firmware: Enhanced E‑version firmware, supports extended protection logic and event recording capacity.

Core Protection & Monitoring Capabilities

Equipped with multiple programmable protection elements for AC motor assets: thermal overload, locked‑rotor stall, phase unbalance, phase loss, ground fault, over‑current, under‑current dry‑run detection and start‑up time supervision. Advanced thermal model simulates motor heating and cooling cycles, calculating real‑time thermal capacity to avoid insulation damage caused by frequent motor startups. Built‑in event log and fault oscillography storage. It records fault timestamp, current values and operational snapshots for post‑incident root‑cause analysis. All alarm thresholds and time‑delay parameters can be adjusted according to actual motor nameplate specifications on‑site.

On‑site Installation & Commissioning Notes

Install the relay inside MCC or control cabinet, 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 and allowable starting time. 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 characteristics. ‑ Phase unbalance / phase loss alarm: Grid power supply abnormality, loose field terminals or internal motor winding defects. ‑ 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 interference from field wiring.