GE Multilin 469 management of medium and large motors

GE Multilin 469 management of medium and large motors

DESCRIPTION

The Multilin™ 469 Motor Protection System, a member of the SR family of relays, provides protection, control, simplified configuration and advanced communications in a cost effective industry leading draw-out construction. Designed for medium voltage motors, the 469 delivers advanced protection with customizable overload curves and single CT differential protection for added flexibility. The 469 also provides simplified configuration using the Motor Settings Auto-Configurator, providing a quick and easy set-up of motor parameters. Coupled with advanced protection and diagnostics, the 469 provides users the flexibility of multiple communication protocols allowing integration into new and existing control networks.

Key Benefits

• Comprehensive motor protection plus voltage dependant overload curves, torque metering and protection, broken rotor bar protection 

• Most advanced thermal model - Including multiple RTD inputs for stator thermal protection 

• Minimize replacement time - Draw-out construction 

• Complete asset monitoring - Temperature, Analog I/O, full metering including demand & energy 

• Improve uptime of auxiliary equipment - Through I/O monitoring 

• Reduce troubleshooting time and maintenance costs - Event reports, waveform capture, data logger 

• Built in simulation functions simplify testing and commissioning 

• Cost Effective Access to information - Through standard RS232 & RS485 serial ports, and optional Ethernet and DeviceNet Ports 

• Field upgradable firmware and settings 

• Optional Conformal coating for exposure to chemically corrosive or humid environments

Protection and Control

• Thermal model biased with RTD and negative sequence current feedback 

• Start supervision and inhibit 

• Mechanical jam 

• Voltage compensated acceleration 

• Undervoltage, overvoltage 

• Underfrequency 

• Stator differential protection 

• Thermal overload 

• Overtemperature protection 

• Phase and ground overcurrent 

• Current unbalance 

• Power elements 

• Torque protection 

• Dual overload curves for 2 speed motors 

• Reduced voltage starting control

Protection and Control

The 469 is a digital motor protection system designed to protect and manage medium and large motors and driven equipment. It contains a full range of selectively enabled, self contained protection and control elements as detailed in the Functional Block Diagram and Features table.

Motor Thermal Model

The primary protective function of the 469 is the thermal model with six key elements:

• Overload Curves 

• Unbalance Biasing 

• Hot/Cold Safe Stall Ratio 

• Motor Cooling Time Constants 

• Start Inhibit and Emergency Restart 

• RTD Biasing