GE Multilin 469-P1-HI-A20-T-H Motor Management Relay
Product Overview
The GE Multilin 469-P1-HI-A20-T-H is a high‑performance, draw‑out style motor management relay designed for the protection, control, and monitoring of medium and large three‑phase motors in critical industrial applications. As part of the GE Multilin 469 series, it integrates advanced thermal protection, flexible I/O, and rich communication functions to deliver comprehensive motor health management and fault diagnostics. The conformal‑coated variant (‑H) ensures reliable operation in harsh, humid, or corrosive environments, making it ideal for heavy industry, power generation, and process automation scenarios.
Key Features
Advanced Thermal Protection & Motor Modeling
Equipped with a highly accurate thermal model supporting voltage‑dependent overload curves, which dynamically adjust during motor acceleration for high‑inertia loads. It incorporates multiple RTD inputs for stator winding temperature monitoring, broken rotor bar protection, and hot/cold safe stall ratio settings, delivering precise thermal protection and preventing motor overheating damage.
Comprehensive Electrical Protection
Provides full‑scope protection functions including overcurrent, short‑circuit, ground fault (sensitive down to 5% of full‑load current), current unbalance, phase reversal, under/over voltage, under/over frequency, and stall protection. It also features single CT differential protection for added winding fault sensitivity, ensuring reliable safeguarding for various motor fault conditions.
Flexible I/O & High‑Precision Measurement
Comes with 9 opto‑isolated digital inputs, 6 configurable relay outputs, and 4 isolated 4–20 mA analog outputs (A20) for seamless integration with PLCs, SCADA, and DCS systems. It supports high‑accuracy metering of current, voltage, power, frequency, and torque, with a measurement precision of ±1%. The P1 configuration accepts 1 A phase CT secondary inputs, adaptable to a wide range of motor current ratings from 1 to 5000 A.
Robust Communication & System Integration
Integrated with RS‑232 and RS‑485 serial ports, supporting Modbus RTU and GE proprietary protocols. Optional Ethernet and DeviceNet interfaces are available for networked system integration. It works with GE EnerVista 469 software for easy configuration, real‑time data monitoring, event record analysis, and firmware upgrades, simplifying system commissioning and maintenance.
Draw‑Out Construction & Harsh Environment Adaptability
Features a panel‑mounted draw‑out chassis design, enabling hot‑swap replacement without system shutdown to minimize maintenance downtime. The conformal coating (‑H) provides protection against moisture, dust, and chemical corrosion. The front panel has an IP40 rating and the rear an IP20 rating, with an operating temperature range of -40°C to +60°C, suitable for extreme industrial conditions.
Powerful Diagnostics & Maintenance Functions
Built‑in self‑diagnostics continuously monitor relay hardware and I/O status. It supports event logging, waveform capture, and data logging for fault root‑cause analysis. The 40‑character backlit LCD with a keypad enables on‑site parameter checking and configuration, while LED indicators provide visual fault alerts for quick troubleshooting.
Technical Specifications
Manufacturer: GE Multilin (GE Vernova)
Model: 469-P1-HI-A20-T-H
Product Type: Motor Management Relay / Motor Protection System
CT Input Rating: P1 = 1 A phase CT secondaries
Control Power (HI): 90–300 VDC or 70–265 VAC, 48–62 Hz
Digital Inputs: 9 opto‑isolated inputs
Relay Outputs: 6 configurable outputs
Analog Outputs: 4 × 4–20 mA isolated outputs
Communication Interfaces: RS‑232, RS‑485 (Modbus RTU), optional Ethernet/DeviceNet
Display: 40‑character backlit LCD with keypad
Protection Functions: Overload, short‑circuit, ground fault, unbalance, stall, over/under voltage, over/under frequency, broken rotor bar, RTD thermal protection
Measurement Precision: ±1% (current, voltage, power)
Operating Temperature: -40°C to +60°C
Storage Temperature: -40°C to +80°C
Relative Humidity: 0%–95% non‑condensing (at 55°C)
Protection Class: IP40 (front), IP20 (rear)
Coating: Conformal coated (‑H) for harsh environments
Mounting: Panel mount, draw‑out chassis
Weight: Approximately 4.5 kg (10 lbs)
Certifications: CE, UL, IEC 61000‑6‑2
Core Functions
Motor Protection & Fault Prevention
Monitors motor electrical and thermal parameters in real time, activating protection actions (tripping, alarm) under abnormal conditions such as overload, short circuit, ground fault, and overheating. It prevents motor burnout and mechanical damage, extending motor service life and reducing unplanned downtime.
Precision Monitoring & Data Acquisition
Collects and processes motor operating data including current, voltage, power, frequency, temperature, and torque. It provides high‑precision metering and real‑time status display, supporting energy consumption analysis and equipment performance assessment for predictive maintenance strategies.
System Control & Interlock
Supports motor start/stop control, emergency restart, start inhibit, and interlock logic configuration. The relay’s programmable I/O enables seamless coordination with external devices (valves, contactors, sensors), realizing automated motor control and safe interlock protection in complex processes.
Communication & Remote Management
Serves as a data bridge between the motor and upper‑level control systems (PLC/SCADA/DCS). It transmits real‑time operating data, fault codes, and event records, while receiving remote configuration and control commands. This enables centralized management, remote diagnostics, and efficient maintenance of distributed motor assets.
On‑Site Configuration & Maintenance
The LCD keypad allows technicians to set parameters, view real‑time data, and check fault records on site without additional tools. The draw‑out design simplifies replacement, while built‑in simulation functions facilitate testing and commissioning, reducing maintenance complexity and time.
Typical Applications
Power Generation: Thermal, hydro, and gas power plants for large motor control (fans, pumps, compressors) and generator auxiliary system protection.
Metallurgy & Mining: Mining conveyors, crushers, and metallurgical rolling mills for high‑inertia motor protection and heavy‑load drive control.
Petrochemical & Oil/Gas: Refineries, chemical plants, and offshore platforms for pump, compressor, and mixer motor management in explosive and corrosive environments.
Water Treatment & Utilities: Water supply pumps, wastewater treatment blowers, and desalination plants for reliable motor operation and energy efficiency optimization.
Process Industry: Pulp and paper, cement, and food processing plants for medium‑voltage motor protection, process control, and equipment health monitoring.
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