GE SR469-P5-H-A20-T

Description

Product Overview

The GE SR469-P5-H-A20-T is a high-performance, multi-function motor protection relay from GE’s Multilin 469 series. This device is engineered to provide comprehensive protection, monitoring, and control for large and critical AC induction and synchronous motors. Far more than a simple spare part, the GE SR469-P5-H-A20-T is an intelligent electronic device (IED) that integrates directly into automation systems, offering detailed motor diagnostics and communication capabilities. As a cornerstone of motor management, the reliability of the GE SR469 is paramount for preventing costly motor failures and downtime.

Key Product Parameters

• Product Type: Motor Management Relay

• Series: GE Multilin 469

• Model Suffix Decoding (Example):

  • P5: Specific hardware platform or package style.

  • H: Typically indicates a high-resolution display.

  • A20: Likely denotes specific hardware options, such as a 20A breaker rating for the onboard output relays or a specific I/O configuration.

  • T: May indicate a specific communication or firmware option.

• Protection Functions: Includes a full suite: Thermal Overload (49), Short Circuit (50), Locked Rotor (51LR), Unbalance (46), Ground Fault (50G/51G), Under/Overvoltage (27/59), Under/Overfrequency (81), and many more.

• Control Functions: Direct start/stop control, programmable logic, and multiple configurable output relays.

• Measurements: Monitors current (3-phase & ground), voltage, power, power factor, energy, and motor thermal capacity used.

• Communication: Multiple ports supporting Modbus RTU, Modbus TCP/IP over Ethernet, and often DeviceNet or PROFIBUS DP.

• Inputs/Outputs: Includes digital inputs for status/control and configurable Form-C output relays.

Advantages and Core Features

The primary advantage of the GE SR469-P5-H-A20-T is its deep integration of protection, control, and diagnostics into a single device, replacing multiple discrete components (overload relays, meters, protection relays). Its advanced thermal model provides accurate motor protection across the entire speed-torque curve, including during starts and stalls. The large, intuitive HMI (Human-Machine Interface) allows for local configuration and provides clear fault descriptions and operational data. The relay’s extensive communication capabilities enable seamless integration into PLC/DCS and SCADA systems for centralized motor management, making the SR469-P5-H-A20-T a critical data source for predictive maintenance strategies.

Application Scenarios

This relay is specified for critical motors across heavy industries:

• Oil & Gas: Protecting large seawater injection pumps, gas compressors, and crude oil transfer pumps.

• Power Generation: Managing critical motors for boiler feed pumps, induced draft (ID) and forced draft (FD) fans, and cooling water pumps.

• Mining & Minerals: Protecting crusher motors, conveyor drives, and slurry pumps.

• Water/Wastewater: Safeguarding large raw water intake pumps and aeration blowers.

• Chemical Processing: Protecting motors on agitators, mixers, and large centrifugal compressors.

Comparison with Competing Products

The GE SR469 competes directly with other high-end motor management relays such as the Siemens SIPROTEC 7SK80, the ABB REM 610, and the Schneider Electric Sepam 80. Its key strengths lie in the sophistication of its motor thermal model, the usability of its local interface, and its strong integration within the wider GE Multilin ecosystem (compatible with GE UR and Multilin communication protocols). Compared to basic overload relays or simple protective devices, the SR469-P5-H-A20-T offers an order of magnitude more functionality, data, and system integration, justifying its use for high-value assets.

Selection Guide and Important Notes

Selecting the GE SR469-P5-H-A20-T requires a detailed analysis of the motor’s nameplate data, starting characteristics, and the required protection and control functions.

Important Precautions:

• Motor Data Accuracy: Successful configuration depends on accurate motor FLA (Full Load Amps), service factor, locked rotor current, and thermal time constants from the motor manufacturer.

• CT (Current Transformer) Sizing: The external CTs must be correctly sized and matched to the relay’s input specifications. Incorrect CTs will lead to faulty measurements and protection.

• Configuration Complexity: While powerful, the relay has hundreds of settings. Configuration should be performed by a trained technician using the dedicated EnerVista SR Setup software to ensure all protections are correctly set and coordinated.

• Testing: After installation and configuration, the protective functions should be validated through primary injection testing to ensure the SR469-P5-H-A20-T will operate as intended during a real fault.

• Communication Setup: Integrating the relay into a network requires proper configuration of IP addresses, Modbus registers, or other protocol-specific settings.

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