825-PR12D Allen‑Bradley (RTD) Scanning Module

Description

825-PR12D Allen‑Bradley (RTD) Scanning Module

Product Dimensions：

Product Detailed Description

The Allen-Bradley 825-PR12D is an external Resistance Temperature Detector (RTD) Scanner Module designed and manufactured by Rockwell Automation for use with the 825-P Modular Protection System. It enables precise temperature monitoring and thermal protection for electric motors by scanning up to 12 independent RTD inputs, which can be assigned to monitor critical components such as motor windings, bearings, ambient conditions, or other locations. The module communicates with the 825-P relay via a simplex 62.5/125 μm fiber-optic cable (with ST connectors, not included) for noise-immune data transmission over distances up to 500 meters. Key functionalities include configurable trip and warning thresholds per RTD, voting logic to prevent false trips, temperature biasing for adaptive protection, and fault detection for open/short circuits or communication failures. It integrates seamlessly into the 825-P’s overall protection scheme, including thermal modeling, overload, and jam protection, but cannot operate standalone. Configuration is performed via the 825-P front panel, MPS Explorer software, or serial/DeviceNet/Modbus protocols.

Product Parameters

The 825-PR12D offers extensive configurable parameters and read-only data registers for RTD monitoring, accessible via Modbus or DeviceNet. Below is a summary of key parameters and specifications.

RTD Configuration Parameters

Product Advantages

• Comprehensive Monitoring: Supports up to 12 RTDs for detailed temperature tracking across motor components, enabling early detection of hotspots and preventing failures.
• Adaptive Protection: Features like per-RTD trip/warning thresholds, voting logic, and ambient biasing adjust protection dynamically, reducing nuisance trips and improving accuracy in varying conditions.
• Fault Tolerance: Automatically detects and isolates faulty RTDs (e.g., open/short circuits), ensuring reliable operation with remaining sensors.
• Noise-Resistant Communication: Fiber-optic link provides electrical isolation and immunity to interference, ideal for harsh industrial environments.
• Integration and Flexibility: Seamless compatibility with 825-P for thermal modeling and overload protection; supports DeviceNet/Modbus for SCADA/PLC connectivity and remote diagnostics.
• Cost-Effective Reliability: Enhances motor lifespan by integrating precise thermal data into existing protection systems, minimizing downtime and maintenance costs.
• Extended Installation Options: 500m fiber-optic range allows remote placement near motors without signal loss.

Precautions and Attention Matters

• Installation Safety: De-energize the 825-P relay before connecting or disconnecting the module to avoid electrical shock from hazardous live parts. Use ESD-safe practices and grounding straps during handling.
• Cable Compatibility: Only use a simplex 62.5/125 μm fiber-optic cable with ST connectors (e.g., 1570FCBL-MM-SX-62-STST-2M); incompatible cables will cause communication failures and trigger “RTD Fail Trip” alarms.
• Configuration Sequence: Connect the module before enabling RTD settings in the 825-P; otherwise, parameters will be inaccessible. Limit ambient RTDs to one only—multiple will cause configuration errors.
• Wiring Guidelines: Employ proper 3-wire RTD connections and ground the voltage neutral terminal. Verify wiring for open/short faults during commissioning.
• Environmental Limits: Install in a sheltered enclosure within -20°C to +60°C; avoid direct exposure to moisture, dust, or extremes exceeding specs to prevent damage.
• Maintenance and Testing: Regularly test RTD inputs via the 825-P panel or MPS Explorer. Replace the RTC battery (Rayovac BR2335 equivalent) if timekeeping fails. Do not apply voltage to core balance CTs during tests.
• Fault Response: Failed RTDs are ignored, but monitor for Bias Alarms (e.g., if RTD %TCU exceeds thermal %TCU by >10%). Invalid settings may inhibit protection—always validate during setup.
• Discontinued Status: This product is discontinued by the manufacturer; source from certified resellers and confirm firmware compatibility.

Product Applications

• Motor Thermal Protection: Ideal for three-phase induction motors in industrial settings, monitoring windings, bearings, and ambient temperatures to prevent overload-induced failures.
• Pumps and Compressors: Provides precise RTD-based tripping in high-load applications like centrifugal pumps or air compressors, integrating with thermal models for extended run times.
• Conveyors and Fans: Used in material handling systems for bearing temperature surveillance, with voting logic to avoid false stops in continuous operations.
• High-Inertia Drives: Supports multi-speed or star-delta starters in cranes, hoists, or winders, where accurate ambient biasing ensures reliable protection under load variations.
• Distributed Systems: Fiber-optic connectivity enables remote scanner placement near motors in large facilities, such as refineries or manufacturing plants.
• Automation Integration: Connects via DeviceNet/Modbus to PLCs/SCADA for real-time data logging, event recording, and predictive maintenance in process control environments.
• Harsh Environments: Suited for electrically noisy or hazardous areas (e.g., mining, oil & gas) due to its isolation features and fault diagnostics.

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