GE Multilin 269PLUS-D/O-111-100P-HI belongs to the 269PLUS fully digital motor management relay series. Built on a microprocessor architecture, it delivers integrated protection, condition monitoring and logic control for three-phase industrial AC motors, and is designed for installation in complete medium and low-voltage motor control center switchgear cabinets.
The device integrates the self-developed FlexCurve thermal model algorithm, which simultaneously samples current circuits and up to 12 channels of RTD temperature signals. It covers full-condition protection logic including motor startup, steady-state operation and locked-rotor fault conditions. Equipped with a local backlit keypad display and RS485 Modbus RTU communication interface, it can connect to SCADA, PLC and DCS systems for remote data upload and parameter downloading.
The suffix D/O in the model stands for standard digital input/output expansion board; 111 is the hardware function configuration code; 100P denotes compatibility with 100-ohm platinum resistance temperature detectors; HI refers to the high-temperature protective coating variant. Suited for harsh industrial sites with heavy dust, high humidity and drastic temperature fluctuations, it enables synchronous monitoring of motor stator, bearing and ambient temperatures. The unit stores 50 sets of time-stamped fault records to accelerate fault localization and equipment maintenance turnaround time.
Model Code Breakdown
Full Model: 269PLUS-D/O-111-100P-HI Segment-by-Segment Explanation
- Segment 269PLUS: Product series code, fully digital upgraded motor management relay. The base model is 269; "PLUS" stands for enhanced version with expanded functions.
- Segment D/O: Hardware I/O configuration identifier. D = Digital Input circuit, O = Programmable output relay. This suffix means the unit is equipped with an extended digital I/O board. Models without this suffix adopt basic I/O configuration.
- Segment 111: 3-digit function configuration code. The 1st digit denotes protection function grade, the 2nd represents the number of temperature measuring channels, and the 3rd indicates communication hardware specifications. Code 111 refers to the standard full-function version, enabling complete protection logic, all RTD acquisition channels and Modbus communication.
- Segment 100P: Compatible temperature sensor specification. 100 stands for 100-ohm platinum RTD; P indicates platinum material, matching industrial standard winding and bearing temperature sensors.
- Segment HI: Environmental coating version marker. HI = High-temperature & high-humidity anti-corrosion coating. Models without this suffix are standard indoor units with no protective coating. HI variants are suitable for outdoor, chemical, underground environments with high humidity and heavy dust.
Product Features
Protection Functions
Overload Protection: 8 sets of industry-standard thermal overload curves plus custom smooth FlexCurve curves. Action thresholds can be set according to motor service factor; negative sequence current offset thermal model accurately simulates cumulative winding heat buildup.
Startup Condition Protection: Limits maximum startup times per hour and locks intervals between two startups; trips on acceleration timeout to prevent rotor insulation damage caused by frequent start-stop cycles.
Locked Rotor / Mechanical Jam Protection: Tiered trip logic including fast short-time trip and long-duration stall protection, adaptable to diverse mechanical loads such as fans, pumps and conveyors.
Phase Unbalance / Single-Phase Loss Protection: Real-time positive/negative sequence current ratio calculation. Early warning triggers when unbalance exceeds threshold, and trip activates upon sustained imbalance to avoid local rotor overheating and burnout.
Ground Fault Protection: Dedicated ground current sensing circuit, configurable for alarm or shutdown response against leakage and winding earth short circuits.
Under-Current Protection: Monitors no-load and load-loss conditions for early warning of dry-running pumps, broken fan belts and material interruption on conveyors.
Temperature Protection: 12 programmable RTD channels with independent threshold settings for stator, bearing and ambient temperature; three-stage response logic: Level 1 pre-alarm, Level 2 high-temperature warning, Level 3 trip.
Short Circuit & Reverse Phase Sequence Protection: Instantaneous short-circuit instantaneous trip; startup interlock upon incorrect phase sequence to avoid mechanical damage from reversed motor rotation.
Monitoring & Metering Functions
Real-time three-phase current measurement, real-time thermal capacity percentage display, total operating hour accumulation, total startup counter and maximum temperature peak recording. Stores 50 time-stamped fault event logs with raw pre- and post-fault operation data; data retention upon power failure.
Control & I/O Functions
5 programmable digital inputs for passive external signals including emergency stop, valve limit switches and pressure switches. 4 independent programmable output relays to interlock alarm, circuit breaker tripping and standby equipment startup logic. Adjustable startup lockout time and delayed reset after fault trip to eliminate repeated motor impact startups.
Communication & Software Functions
RS485 terminal on rear panel with standard Modbus RTU protocol, supporting register parameter read/write, real-time data collection and fault log retrieval. Comes with EnerVista PC configuration software for batch parameter setup, operation report export and local firmware upgrade. Supports remote parameter upload/download and bulk configuration replication across multiple relays.
Hardware & Environmental Features
Standard industrial control panel cutout dimensions for universal installation in MCC switchgear cabinets. Wide operating temperature range for general industrial environments. HI coated models deliver superior resistance to moisture, dust and mild chemical corrosion. Backlit large LCD screen for clear data reading inside dim switchgear cubicles.
Application Industries
Water Treatment: Sewage lift pumps, circulating water pumps, aeration blowers, dosing agitator motors
Mining & Metallurgy: Underground drainage pumps, belt conveyors, crushing units, dust removal fans
Chemical & Petrochemical: Process circulation pumps, agitator motors, induced draft fans, refrigeration compressor motors
Thermal Power & New Energy: Boiler forced/induced draft fans, cooling water pumps, coal conveyor motors
Cement & Building Materials: Ball mills, raw material conveyors, dust exhaust fans, cooling units
Food Processing: Mixing pumps, conveying blowers, refrigeration compressors, packaging drive motors
Municipal Utilities: HVAC fans, water supply booster pumps, sewage pumping station units
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