GE Multilin 469 Motor Protection System

Non electrical parameter measurement: 12 channel RTD temperature (range -50~250 ℃, accuracy ± 2 ℃), motor speed (100-7200 RPM, supporting inductive/Hall sensors), analog input (4-20mA/0-20mA/0-1mA, accuracy ± 1% of full range).

（2） Data recording and diagnosis

Event Recorder: Timestamp records system events, storing up to 256 events for easy tracing of fault causes.

Waveform capture: Record 10 waveforms (Ia/Ib/Ic/IG/Diffa/Diffb/Diffc/Va/Vb/Vc) during tripping, with 12 samples per cycle and a total of 64 cycles of data, supporting fault waveform analysis.

Advanced diagnosis: optional rotor bar breakage detection function, continuously monitoring the health status of the rotor through motor current signal analysis (MCSA), early warning of rotor faults (such as starting torque drop, overload, bearing wear), supporting programmable alarms, and achieving predictive maintenance.

Simulation testing: Pre trip and fault conditions (current, voltage, frequency, RTD temperature, etc.) can be simulated without external input, simplifying the debugging and commissioning process.

Hardware specifications and interface configuration

（1） Input/output interface

Current and voltage input

Current input: 2 sets of three-phase CT inputs (phase current CT supports 1A/5A secondary side, specified when ordering; Differential CT field programmable 1A/5A), 2-channel grounded CT input (standard CT supports 1A/5A, high-sensitivity CT supports 50:0.025A), CT withstand capability up to 80 times rated current for 1 second, 40 times rated current for 2 seconds, and 3 times rated current for continuous operation.

Voltage input: Three phase VT input (supporting star/delta connections, full range 273V AC, accuracy ± 0.5% full range, frequency range 20-120Hz), supporting VT fuse fault detection.

Digital and Analog Interface

Digital input: 9-way optically isolated input (5 pre-defined: starter status, emergency restart, remote reset, parameter access, test switch; 4 assignable: remote trip/alarm, speed switch, vibration switch, pressure switch, etc.), supports dry contact or NPN collector input.

Analog input/output: 4-channel configurable analog input (supports 4-20mA/0-20mA/0-1mA, input impedance 226 Ω± 10%), 4-channel configurable analog output (specify 4-20mA or 0-1mA when ordering, accuracy ± 1% of full scale, 4-20mA maximum load 1200 Ω, 0-1mA maximum load 10k Ω).

Output relays: 6 sets of Form-C output relays (4 sets of non fault safe type, can be assigned with trip/alarm function; 1 set of non fault safe type start interlock relay; 1 set of fault safe type service relay, indicating loss of control power or internal fault), supporting interlock function, with a maximum rated contact value of 10A continuous (DC 30V 300W, AC 250V 2770VA).

（2） Human Computer Interaction and Communication

Local interaction: 40 character display screen (displaying parameters, actual values, fault/alarm information), numeric keypad (parameter input and navigation), 22 LED indicator lights (system status, motor status, output relay status), supporting 20 user-defined default messages.

Communication capability: Comes standard with 3 serial ports (front RS232 for debugging, rear 2 RS485 for remote communication), optional 10BaseT Ethernet and DeviceNet ports; Supports Modbus RTU (serial port) and Modbus TCP/IP (Ethernet port), multiple ports can communicate simultaneously, and Ethernet can be connected to local/wide area networks, replacing multi drop wired networks and reducing operation and maintenance costs.

Software and Operations Support

（1） EnerVista software suite

Configuration and Debugging Tools: Provides automatic configuration of motor parameters, firmware upgrades, parameter backup/recovery functions, supports waveform and event viewing, and simplifies fault diagnosis.

Monitoring and integration tools: Viewpoint Monitoring provides plug and play device monitoring, single line diagram monitoring and control, alarm annunitor, trend reports; EnerVista integrator includes OPC/DDE servers, Multilin drivers, and supports seamless integration with existing HMI/SCADA systems.

Maintenance tool: Viewpoint Maintenance provides parameter audit tracking reports, equipment health reports, and comprehensive fault diagnosis to enhance operational security and efficiency.

（2） Pull out structure and retrofit support

Pull out design: easy to replace quickly, reduces downtime, supports wire lead sealing to prevent unauthorized removal.

Retrofit upgrade: With the 8 series Retrofit kit, old SR 469 relays can be upgraded to 869 motor protection systems without modifying existing panel openings, rewiring, or changing drawings. The upgrade process only requires 3 steps (updating parameter files, removing old relays, plug-in reconnection) and can be completed in as fast as 21 minutes, reducing upgrade costs and system downtime.

Technical specifications and environmental adaptability

（1） Key technical parameters

Category specification details

Current measurement CT primary side 1-5000A, secondary side 1A/5A; Accuracy: ± 0.5% for current<2 times CT, ± 1% for current>2 times CT

Voltage measurement VT ratio 1.00-15.00:1, secondary side full range 273V AC; Accuracy ± 0.5% of full scale