Tag: SR469-P1-HI-A1-E

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
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