GE 369‑LO‑R‑M‑O‑E‑0‑E is an integrated digital motor protection and management relay developed by GE Multilin, specifically designed for small and medium-sized AC motors.It integrates high-precision electrical protection, comprehensive temperature monitoring, professional metering, fault diagnosis, and multi-protocol communications.
The model configuration includes: low-voltage power supply (LO), 12 RTD temperature inputs (R), metering function (M), no fiber optic (F), Ethernet communication (E), no advanced diagnostics (H), and corrosion-resistant coating (E).It is widely suitable for continuous production and harsh environment applications such as water pumps, fans, conveyors, and underground pumps, providing full-lifecycle safety control and preventive maintenance support for motors from startup and operation to shutdown.
Model Definition & Core Positioning
369: Basic motor protection systemLO: Control power supply 20–60 VDC / 20–48 VACR: Built-in 12-channel programmable RTD inputs (stator / bearing / ambient)M: Metering option (voltage, power, power factor, frequency, 4 analog outputs)O: No fiber-optic communicationE: Ethernet Modbus TCP/IP0: No Profibus / DeviceNetE: Corrosion-resistant three-proof coating, suitable for humid / chemically corrosive environments
Core Value:One unit replaces traditional thermal relays, protectors, ammeters, temperature patrol instruments, and fault recorders, reducing wiring, commissioning, and maintenance costs.
Core Functions
1. Enhanced Thermal Model Protection (Core Competitiveness)
- 15 standard overload curves + FlexCurve™ custom curves
- Negative-sequence current unbalance bias and RTD temperature bias
- Dual time constants for start/stop to realistically simulate motor heat dissipation
- Real-time thermal capacity calculation (TCU) to prevent overheating burnout
- Cold / hot stall protection, start attempt limit, and start interval lockout
2. Comprehensive Electrical Protection
- Overload / stall / mechanical jam
- Undervoltage / overvoltage / underfrequency / phase reversal
- Undercurrent (pump dry running, belt breakage)
- Current unbalance / phase loss
- Ground fault (supports 50:0.025 sensitive CT)
- Differential protection input interface
- Undervoltage automatic restart
3. RTD Temperature Monitoring (Option R)
- 12-channel 3-wire RTD (Pt100 / Ni120 / Cu10)
- Multi-point temperature measurement for stator, bearing, and ambient
- Three-level thresholds: alarm / high alarm / trip
- RTD wire break / short circuit self-test alarm
4. Metering & Analysis (Option M)
- Phase current / line voltage / power / energy / power factor / frequency
- Motor load factor, remaining thermal capacity, estimated trip time
- 4 programmable analog outputs (0–1 / 0–20 / 4–20 mA)
- Motor health report, start characteristic self-learning, historical trending
5. Fault Diagnosis & Recording
- Event recorder (512 events)
- Fault oscillography (3 groups × 16 cycles)
- Start data logger (up to 30 seconds)
- Trip statistics, operating hours, start attempts
- Configuration change audit trail
6. Communication & Integration
- Front RS232 (commissioning)
- Rear 3× RS485 (Modbus RTU)
- Ethernet Modbus TCP/IP (Option E)
- Seamless connection with DCS / SCADA / HMI
- Unified configuration, commissioning, and analysis via EnerVista software
Technical Specifications
| Item | Specification |
|---|---|
| Control Power | LO: 20–60 VDC / 20–48 VAC |
| CT Input | 1A/5A secondary, true RMS measurement |
| Ground Fault | 0.25–25 A (50:0.025 CT) |
| RTD Range | -40℃ ~ 200℃ |
| Frequency | 20–300 Hz (suitable for VFD) |
| Relay Contacts | 3.5 A/250 VAC, 8 A continuous current |
| Analog Outputs | 4 channels, 4–20 mA programmable |
| Communications | Modbus RTU/TCP, RS232/485, Ethernet |
| Certifications | UL, CSA, CE, ISO 9001 |
Installation, Wiring & Deployment
- Installation Method
- Standard panel mounting, supports remote display and remote RTD module expansion
- Compact size to save cabinet space
- Protection class IP50, dustproof and anti-misoperation
- Suitable for Class I Div 2 hazardous areas (MOD502 certification optional)
- Typical Wiring Guidelines
- Current input: 1A/5A CT, three-phase + ground fault CT
- Voltage input: 240VAC secondary side (Option M)
- RTD: 12-channel 3-wire connection with shielded cabling
- Digital inputs: 6 optically isolated dry contacts (start, speed, differential, remote reset, etc.)
- Relay outputs: 4 Form C contacts (trip / alarm / 2 auxiliary), programmable fail-safe
- Communication: RS232 / RS485 / Ethernet, supports multiple ports online simultaneously
- Rapid Commissioning
- Built-in automatic motor parameter configuration tool, complete settings in 6 steps
- Supports simulation testing; output and analog verification without test instrument
- Front 40-character LCD + 10 LEDs for quick local status monitoring
- On-site firmware upgrade, no need to return to factory
Maintenance & Operation (Reducing Downtime)
- Routine Maintenance
- No wearable parts, no regular disassembly required
- Self-diagnosis covers power supply, RTD, communication and internal circuits
- Automatic health report generation for preventive maintenance guidance
- Startup characteristic trend analysis for early detection of bearing and load abnormalities
- Fault Handling
- Automatically displays cause, current, temperature and unbalance during trip
- Oscillography and event records for fast fault location
- Remote reset and remote monitoring to reduce on-site travel
- Emergency restart function for quick recovery of critical processes
- Lifetime & Environment
- Operating temperature: -40℃ ~ +85℃
- Humidity: 95% non-condensing
- Three-proof coating (Option E) for moisture and corrosion resistance
- Compliant with IEC/EN 61000 EMC standards, strong anti-interference capability
FAQ
Q1: What is the difference between this model and the standard 369?A: This model comes standard with LO low-voltage power supply + 12 RTD channels + metering function M + Ethernet E + corrosion-resistant coating E. It has no fiber-optic or fieldbus communication, making it more suitable for small and medium-sized motors, low-voltage distribution, humid/corrosive workshops, underground pumps, and similar applications.
Q2: Does it support VFD-driven motors?A: Yes. It supports a frequency range of 20–300 Hz, is specially designed for PWM drives, resists harmonic interference, and avoids protection maloperation.
Q3: What sensors can be connected to the RTD inputs?A: It supports Pt100, Ni100, Ni120, and Cu10 sensors in 3-wire configuration, with automatic lead wire resistance compensation.
Q4: Is remote monitoring and parameter modification available?A: Yes. Via Modbus TCP/IP or RS485, EnerVista software allows remote setting read/write, real-time data viewing, and fault waveform retrieval.
Q5: Can it be used for two-speed motors?A: Yes. It features built-in dual overload curves to provide separate protection for high and low speeds.
Q6: What is the purpose of the corrosion-resistant coating?A: The optional E three-proof coating improves reliability and extends service life in chemical plants, coastal areas, high-humidity, and dusty environments.
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