This model integrates a dedicated protection module for synchronous motors, featuring 1/8-cycle high-speed protection, ESA/MCSA motor diagnostics, full-protocol communications and advanced cybersecurity capabilities. It is suitable for highly reliable industrial applications such as oil and gas, mining, cement and water treatment, enabling seamless integration into SCADA/DCS systems, while also supporting rapid migration from the SR 469.

Technical Specifications (Model: 869‑E‑P5‑P5‑B5‑H‑S‑S‑A‑LN‑M‑M‑P‑F‑BSE‑N)

1. Hardware & Configuration

• Platform: Multilin 8 Series, draw-out design for easy testing and maintenance
• Current Inputs: 3-phase 5A + earth fault CBCT (5A)
• Power Supply: Field-replaceable power module, wide voltage range compatible
• HMI: Full-color graphical HMI, supports custom single-line diagrams (SLD), up to 6 pages with 15 status/measurement points per page

I/O Configuration

• Digital Inputs: P5 (16 channels)
• Digital Outputs: P5 (16 channels)
• Analog Inputs: B5 (mixed RTD / analog inputs)
• Communications: High-performance Ethernet (dual ports, supports IEC 61850 Ed2, PRP)
• Options: H (arc flash detection), S (synchronous motor module), S (advanced security), A (advanced applications), LN (local network), M (metering), M (motor management), P (programmable logic), F (fault recording), BSE (base software enhancement), N (networking)

2. Protection & Performance

• Protection Cycle: 1/8-cycle (~2 ms) high-speed protection calculation
• Arc Flash Detection: 2 ms response time, supports 4 optical sensors + overcurrent dual criteria
• Frequency Range: 3–72 Hz, suitable for VFD-driven motors
• RTD Support: Multiple platinum RTD inputs for thermal protection of stator, bearings and field windings

• Event Recording: Extensive fault recording, SOE, motor start statistics and health reports

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3. Core Functions

3.1 Comprehensive Motor Protection

• Electrical Protection: Overcurrent (50/51), earth fault (50G/51G), thermal overload (49, including NEMA/IEC curves, voltage dependency, RTD bias), current unbalance (46), undervoltage / overvoltage (27/59), out-of-step / loss-of-field (40/78), locked rotor / mechanical jam (50LR), start time supervision (48), directional power (32), frequency protection (81)
• Synchronous Motor Dedicated: Field voltage/current monitoring, loss-of-field protection, power factor regulation, automatic resynchronization, start sequence control, rotor temperature monitoring
• Special Operating Conditions: High-inertia loads (voltage-dependent thermal model), VFD operation (harmonic compensation, frequency tracking), cyclic loads (adaptive thermal model)

3.2 Advanced Monitoring & Diagnostics (ESA/MCSA)

• Based on patented Motor Current Signature Analysis (MCSA), detects rotor broken bars, bearing faults, air-gap eccentricity, foundation looseness, misalignment and turn-to-turn shorts without additional sensors
• Real-time Thermal Capacity Utilization (TCU) calculation for early thermal stress warning
• Motor learning data: records 250 start/run parameters (start time, current, TCU, average load, power factor, etc.)
• Health reports, trend analysis, fault recording and waveform playback

3.3 Control & Programmable Logic

• Breaker control, interlocking logic, start inhibit (86), maximum start limit (66)
• Custom programmable logic (PL) for complex process control
• Supports automatic load/unload and reduced-voltage starting control

3.4 Communications & Cybersecurity

• Supported Protocols: IEC 61850 Ed2, IEC 62439/PRP, Modbus RTU/TCP, DNP3.0, IEC 60870-5-103/104
• Interfaces: Dual independent Ethernet ports, front USB, optional Wi‑Fi (WPA2)
• Security: AAA (RADIUS/LDAP), RBAC role-based access control, Syslog security event logging, compliant with NERC CIP requirements

3.5 Arc Flash Protection (AFP)

• Integrated arc flash module with optical + overcurrent dual criteria, tripping in as fast as 2 ms
• Sensor self-diagnostics to reduce nuisance tripping, minimize incident energy and equipment damage

4. Typical Applications

• Oil & Gas: pumps, compressors, fans
• Mining & Metallurgy: ball mills, crushers, conveyors
• Cement: kiln main motors, coal mills
• Water Treatment: large pumps, blowers
• Power Generation: medium‑large auxiliary motors, synchronous motors
• Others: high-inertia loads, VFD-driven applications, cyclic loads, synchronous motor excitation control

5. Product Advantages

• High Speed & Reliability: 1/8-cycle protection reduces fault stress and extends equipment life
• Leading Diagnostics: ESA/MCSA enables predictive maintenance and reduces unplanned downtime
• High Integration: All-in-one protection, control, monitoring and communications, reducing panel equipment and wiring
• Flexible Compatibility: Supports induction / synchronous motors, VFDs, high-inertia and cyclic load applications
• Easy Upgrade: SR 469 upgrade kit available, no rewiring or drawing modifications required, complete in as fast as 21 minutes
• Security & Compliance: Advanced cybersecurity features meeting stringent industrial and power industry standards