Grid Solutions Multilin 469 Complete integrated protection and management of medium and large motors 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. • Start supervision and inhibit • Thermal model biased with RTD and negative sequence current feedback • Mechanical jam • Voltage compensated acceleration • Undervoltage, overvoltage • Underfrequency • Stator differential protection • Thermal overload • Overtemperature protection • Phase and ground overcurrent • Comprehensive motor protection plus voltage dependant overload curves, torque metering and protection, broken rotor bar protection • Current unbalance • Most advanced thermal model - Including multiple RTD inputs for stator thermal protection • Torque protection • Minimize replacement time - Draw-out construction • Dual overload curves for 2 speed motors • Complete asset monitoring - Temperature, Analog I/O, full metering including demand & energy • Reduced voltage starting control • Power elements • 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 Applications • Protection and Management of three phase medium and large horsepower motors and driven equipment, including high inertia, two speed and reduced-voltage start motors Communications • Multiple Ports - 10baseT Ethernet, RS485, RS232, RS422, DeviceNet • Multiple Protocols - Modbus RTU, Modbus TCP/ IP, DeviceNet Monitoring & Metering • A, V, W, var, VA, PF, Hz, Wh, varh, demand • Torque, temperature (12 RTDs) • Event recorder • Oscillography & Data Logger (trending) • Statistical information & learned motor data EnerVista Software • State of the art software for configuration and commissioning Multilin products • Document and software archiving toolset to ensure reference material and device utilities are up-to-date • EnerVista™ Integrator providing easy integrati

469 Motor Protection System Overload Curves 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. The curves can take one of three formats: standard, custom, or voltage dependent. For all curve styles, the 469 retains thermal memory in a thermal capacity used register which is updated every 0.1 second. The overload pickup determines where the running overload curve begins....

469 Motor Protection System The Hot/Cold Safe Stall ratio is used by the relay to determine the lower limit of the running cool down curve, and also defines the thermal capacity level of the central point in RTD Biasing curve. 1.00 Derating Factor Percent Voltage Unbalance Motor derating factor due to unbalanced voltage Motor Cooling Time Constants When the 469 detects that the motor is running at a load lower then overload pickup setpoint, or the motor is stopped, it will start reducing the stored TCU value, simulating actual motor cool down process. TCU decays exponentially at a rate dictated...

469 Motor Protection System The backup feature can also be assigned to an auxiliary contact for annunciation or remote tripping of upstream protection devices Reactive Power Ground Fault This function is designed to protect motors against phase to ground faults. Used to detect loss of load. There are two dedicated ground current inputs in the relay, which support the following types of ground current detection. • Core balance (Zero sequence) current transformer. • Core balance (Zero sequence) 50:0.025 A (sensitive) current transformer. • Residual connection of phase current transformers. The...

469 Motor Protection System be set to issue trip or alarm commands based on signal thresholds. Use the four configurable analog outputs available in the 469 to provide standard transducer signals to local monitoring equipment . The desired output signal must be specified when the relay is ordered, either 4-20 mA, or 0-1 mA. The analog outputs can be configured to provide outputs based on any measured analog value, or any calculated quantity. Output Relays There are six Form-C output relays available in the 469. Four relays are always non-failsafe and can be selectively assigned to perform trip,...

469 Motor Protection System Event Recorder The event recorder stores motor and system information with a date and time stamp each time a system event occurs. Up to 256 events are recorded. User Interfaces Keypad and Display The 469 records up to 64 cycles with 12 samples per cycle of waveform data for 10 waveforms (Ia, Ib, Ic, Ig, Diffa, Diffb, Diffc, Va, Vb, Vc) each time a trip occurs. The record is date and time stamped. The 469 has a keypad and 40 character display for local monitoring and relay configuration without the need for a computer. Up to 20 user-selected default messages can be...