Description

The GE Multilin SR469-P5-HI-A20-E is a high-end, digital Motor Management Relay designed for the protection, control, and monitoring of medium to large horsepower motors. As part of the SR (System Relay) family, it is engineered to manage three-phase motors and their associated mechanical systems. It provides comprehensive thermal modeling and integrated protection logic to prevent motor damage due to electrical faults, mechanical overloads, or cooling failures.

GE SR469-P5-HI-A20-E

1. Technical Parameters & Specifications

The SR469-P5-HI-A20-E is defined by its specific hardware configuration, which determines its power supply range, current sensing capabilities, and output options.

Core Protection & Control Features

• Thermal Modeling: Uses a sophisticated algorithm that accounts for “Hot/Cold” stall ratios, motor cooling constants, and RTD feedback to create a real-time thermal image of the motor.
• RTD Monitoring: Supports up to 12 RTD inputs (Pt100, Ni100, Cu10, etc.) for direct temperature monitoring of stator windings and bearings.
• Mechanical Protection: Includes specialized protection for jammed pumps, broken couplings (underpower), and excessive starts per hour.
• Voltage & Frequency: Integrated sensing for over/under voltage and frequency, as well as phase reversal protection.

2. Product Datasheet Summary

• Event Recording: The relay stores a detailed event record (up to 256 events) and waveform captures (oscillography) to assist in post-fault forensics.
• Programming: Configuration is managed via the front keypad or the EnerVista 469 Setup software, allowing for logic simulation and setting validation.
• Enclosure: Standard 19-inch rack-mount or panel-mount chassis with a draw-out design that allows for module replacement without disturbing field wiring.
• Input/Output Logic: Features 6 output relays (some fixed, some programmable) and 9 assignable digital inputs for remote trip, reset, or process interlocks.

3. Country of Origin

The GE Multilin SR469-P5-HI-A20-E is primarily designed and manufactured in Canada. GE Multilin’s center of excellence for relay protection is located in Markham, Ontario, where the SR and UR series products undergo high-standard environmental and functional testing.

4. Application Areas

This specific relay is typically found in heavy industrial sectors:

• Oil & Gas: Protection of high-capacity pumps and compressors in refineries and pipelines.
• Mining: Managing large conveyor drives, crushers, and mill motors.
• Power Plants: Controlling auxiliary motors for feedwater pumps and draft fans.
• Water Treatment: Supervising large vertical turbine pumps in municipal pumping stations.

GE SR469-P5-HI-A20-E

5. Usage & Installation Guidelines

Installation

• Mounting: Ensure the panel cutout matches the 469 dimensions precisely. Use the included mounting hardware to secure the flange.
• Grounding: The relay case must be grounded to the station ground bus using a low-impedance wire to ensure the internal surge protection functions correctly.

Wiring

• CT Polarities: Pay strict attention to Current Transformer (CT) polarities to ensure accurate power calculations and differential protection (if enabled).
• Isolation: The 4–20 mA outputs (A20 option) are internally isolated, but shielded cables should be used for all analog and RTD wiring to prevent EMI interference.

6. Recommended Related GE Multilin Models

For systems utilizing the SR469, the following related products are often integrated into the same power distribution network:

• GE Multilin SR745: A high-speed Transformer Management Relay for protecting the main supply transformer.
• GE Multilin SR750/760: Feeder Management Relays used for general circuit protection and distribution control.
• GE Multilin 369: A more compact motor relay for smaller motors that do not require the extensive RTD or voltage sensing of the 469.
• EnerVista Software Suite: Required for network integration and advanced data visualization of the relay’s records.