GE 369-HI-R-M-0-P-0-E Motor Management Relay

Model Number Breakdown

• 369: Product series identifier for the GE Multilin motor management relay line.

• HI: Specifies the control power supply input, which supports a wide range of 50–300V DC or 40–265V AC.

• R: Indicates the unit is equipped with 12 built-in RTD (Resistance Temperature Detector) inputs for direct motor winding and bearing temperature monitoring.

• M: Denotes the inclusion of an optional metering package. This enables the relay to monitor critical electrical parameters including voltage, wattage, frequency, and energy consumption.

• 0: Signifies there is no optional fiber optic port installed.

• 0: Signifies there are no additional optional protocol interfaces installed.

• E: Represents the enhanced diagnostic feature set, which includes an enhanced front panel display, enhanced motor diagnostics, an expanded event recorder, and a secure audit trail function.

Technical Specifications

• Control Power Supply: 50–300V DC / 40–265V AC

• Phase Current Inputs: Compatible with 1A and 5A secondary current transformers

• Current Monitoring Range: 0–6000A (via external CT connection)

• RTD Inputs: 12 channels, supporting 3-wire 100Ω Pt, 100Ω Ni, 120Ω Ni, or 10Ω Cu RTDs. RTD sensing current is 3 mA. Temperature monitoring range is -40°C to 200°C.

• Communications: Non-isolated RS232 port and an RS485 port supporting Modbus RTU/TCP protocols.

• Differential Switching Time Delay: Less than 200ms

• Event Recording Capacity: Stores up to 512 events

• Fault Recording: Stores the last 10 fault events with timestamps, fault type, and current magnitude.

• Operating Temperature Range:

  • Functional Range: -30°C to 70°C

  • Listed Range: -40°C to 60°C

• Maximum Altitude: 2000m

• Isolation: 1500Vrms electromagnetic interference (EMI) isolation; 36 Vpk isolation for RTD inputs.

Key Functional Features

• Comprehensive Motor Protection: Provides multi-layered protection against thermal overload, overcurrent (instantaneous and time-delay), phase loss, ground fault, locked rotor, and short circuit conditions. The relay is designed to trip within 50ms in critical scenarios such as a phase loss to prevent motor damage.

• Pre-Trip Alarm: Issues early warnings for conditions that could lead to a trip—such as ground faults, mechanical jams, or RTD overtemperature—allowing operators to take proactive corrective actions and avoid unplanned downtime.

• Motor Health Reporting: Leverages historical trip data and learned information to assess the overall health of the motor. It predicts potential maintenance needs to assist in extending motor life and optimizing maintenance schedules.

• Waveform Capture: Triggers and captures waveforms during a trip event. It records three waveforms of sixteen data cycles each for phase current, ground current, and contact input status, providing detailed data for post-fault analysis.

• Enhanced Diagnostics: The “E” designation provides an enhanced event recorder for detailed root-cause analysis, alongside a security audit trail to track setting changes and access history.

• Precision and Adaptability: Features a high sampling accuracy of ±0.5%. Adjustable protection parameters, including overcurrent trip time (0.1s to 30s) and ground fault current threshold, allow precise matching to diverse motor ratings from large compressors to smaller pumps.

• Remote Monitoring and Control: Via the RS485 Modbus communication port, users can remotely monitor motor current, temperature, and fault status through a SCADA system, significantly reducing the need for on-site inspections in remote locations like pump stations.

Application Scenarios

• Power Generation Plants: Critical for protecting large forced-draft and induced-draft fan motors, often rated at 1000kW and above, where failure can lead to boiler shutdowns and significant generation losses.

• Steel Mills and Metals Processing: Safeguards main rolling mill motors subjected to heavy mechanical shock, frequent starts, and potential locked rotor conditions. It helps maintain high operational availability by preventing motor burnout during material jams.

• Chemical and Petrochemical Plants: Protects reactor agitator motors where continuous operation is vital. A motor failure during a batch process can lead to total product loss, making the relay’s early fault detection and swift tripping essential.

• Water and Wastewater Treatment: Monitors large municipal water supply pumps. It prevents motor damage from ground faults and overloading and enables remote load management based on water demand to optimize energy consumption.