The 8851-LC-MT is a high-performance motor control module designed for Allen-Bradley (AB) PowerFlex 755 drives, a leading solution in industrial automation and motion control. Engineered for precision and reliability, the 8851-LC-MT enables seamless integration with AB’s EtherNet/IP network, supporting real-time data exchange and advanced motor management. This module delivers dynamic torque control, energy optimization, and safety features (STO, SS1, SS2) compliant with ISO 13849-1. The 8851-LC-MT is ideal for applications requiring high-speed communication, flexible I/O, and robust protection in harsh industrial environments.
2. Product Parameters
Parameter
Specification
Brand & Model
Allen-Bradley 8851-LC-MT
Voltage Range
200–690 V AC (input), 0–600 V DC (output)
Current Rating
Up to 1,200 A (continuous)
Communication
EtherNet/IP (10/100 Mbps), DeviceNet (optional)
I/O Interfaces
16 digital inputs, 8 digital outputs, 4 analog inputs (0–10 V/4–20 mA)
Control Modes
Vector (FOC), Volts/Hertz (V/Hz), Sensorless
Safety Compliance
SIL 3, PL e (ISO 13849-1)
Temperature Range
-40°C to +50°C (industrial grade)
Compatibility
PowerFlex 755/755T drives
8851-LC-MT
3. Advantages and Features
High-Speed Control: Achieves 20 kHz switching frequency for precise motor performance.
Energy Efficiency: Reduces energy consumption by 15–20% via regenerative braking and adaptive tuning.
Safety Integration: Built-in Safe Torque Off (STO) and dual-channel safety inputs for compliant machine designs.
Modular Design: Hot-swappable I/O modules allow field upgrades without system downtime.
Reliability: MTBF > 1,000,000 hours (per AB testing), with conformal coating for moisture and dust resistance.
4. Application Areas and Use Cases
Industries:
Manufacturing (conveyor systems, robotics)
Energy (pumps, fans in power plants)
Automotive (assembly line drives)
Mining (heavy machinery propulsion)
Case Study: A European steel mill deployed the 8851-LC-MT in their rolling mill drives. The module’s real-time torque control and EtherNet/IP synchronization improved production line efficiency by 12%, while regenerative braking reduced energy costs by €80,000 annually.
5. Competitive Comparison
Against comparable motor control modules:
Faster Communication: 2x higher EtherNet/IP throughput (100 Mbps vs. 50 Mbps in legacy systems).
Compact Footprint: 30% smaller than equivalent modules (178 mm x 254 mm vs. 250 mm x 300 mm).
Integrated Safety: Pre-certified SIL 3/PL e reduces engineering time by 40% versus add-on safety modules.
8851-LC-MT
6. Selection Recommendations
System Compatibility: Ensure alignment with PowerFlex 755/755T drives and existing EtherNet/IP networks.
Power Requirements: Match current rating (1,200 A max) to motor load; consider derating for ambient temperatures > 40°C.
Safety Needs: Specify models with integrated STO/SS1 for safety-critical applications (e.g., machinery directive 2006/42/EC).
Expansion: Reserve I/O slots for future sensors (e.g., temperature monitoring, vibration analysis).
7. Precautions
Installation: Follow AB’s EMC guidelines; use shielded cables for EtherNet/IP connections.
Cooling: Maintain airflow (2 m/s min) around the module; avoid stacking in enclosed cabinets.
Software Updates: Regularly update firmware (via AB Logix Designer) for compatibility with new drive features.
Safety Testing: Perform annual safety function tests (STO response time < 20 ms per ISO 13849-1).
Shanxi Xinyeda International Trade Co., Ltd. is your trusted partner for Allen-Bradley automation solutions. We supply the 8851-LC-MT and a full range of PowerFlex spare parts, backed by technical expertise and 24/7 support. Visit our website www.xydcontrol.com or contact us to optimize your industrial drive systems today.
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Full 12-month warranty on all components
Full 12-month warranty on all components
