Hitachi WJ200N-055HFC Inverter High-Capacity Control and Advanced Features for Heavy-Duty Applications

Hitachi WJ200N-055HFC Inverter

The Hitachi WJ200N-055HFC represents a significant step into the realm of medium-power industrial motor control, delivering robust performance and advanced features for demanding applications. Designed to control three-phase AC induction motors with a rating of 5.5 kW (7.5 HP) in constant torque mode and 7.5 kW (10 HP) in variable torque mode, this inverter is engineered for systems where reliability, precision, and power are non-negotiable. It serves as a cornerstone for industrial automation in applications such as large conveyor systems, industrial pumping stations, heavy-duty ventilation, and processing machinery, where its enhanced power capacity and advanced control capabilities ensure optimal performance and operational efficiency.

Advanced Performance for Demanding Industrial Environments

High-Capacity Control with Precision

The WJ200N-055HFC builds upon the series' proven technology, scaling it to meet the demands of more powerful motors and tougher loads.

• High-Torque Sensorless Vector Control (SLV): Maintains the signature 200% starting torque at 0.5 Hz, providing the necessary muscle to start high-inertia loads smoothly and reliably, even under full load, without the need for a feedback encoder.

• Enhanced Thermal Management: This model features a forced ventilation cooling system (cooling fan) to effectively dissipate heat generated during high-current operation, ensuring stability and longevity even in high-ambient-temperature environments or during continuous heavy-duty cycles.

• Advanced Motor Adaptation: The auto-tuning function precisely captures motor parameters, allowing the inverter to optimize its control strategy for superior speed regulation, dynamic response, and efficiency across the entire operating range, which is critical for applications with varying load conditions.

Operational Efficiency and Energy Intelligence

• Dynamic Energy Optimization: The energy-saving mode is particularly effective at this power level, where even small percentage gains translate into significant cost savings. It actively reduces output voltage to match the load requirement, minimizing wasteful power consumption during periods of low demand.

• Advanced Braking Capabilities: The drive is designed to work seamlessly with external braking resistors, providing controlled and rapid deceleration for high-inertia loads. This is essential for applications like descending conveyors, centrifuges, or large fans, improving safety and cycle times.

Sophisticated Programmability and System Integration

• Comprehensive Parameter Set: It offers access to the full suite of WJ200N series parameters, allowing for fine-tuning of every aspect of motor control, from complex acceleration/deceleration patterns (including S-curve and user-defined curves) to PID controller gains and multi-step speed sequences.

• Diverse Control Integration: Supports a wide array of command sources. Speed references can be provided via analog inputs, digital communications (Modbus, or optional fieldbus cards like Profibus or DeviceNet), digital terminals for up to 16 preset speeds, or the integrated keypad.

• Dual Motor Control Functionality: A standout feature for this class, the inverter can store two complete sets of motor parameters (1st and 2nd motor). This allows a single drive to control two different motors alternately (not simultaneously) via a digital input command, offering tremendous flexibility and cost savings for applications with multiple driven machines.

Robust Protection and Predictive Maintenance

• Industrial-Grade Protection: The protective features are designed to handle the higher energy levels present at this power rating. This includes robust overcurrent and short-circuit protection, precise electronic thermal overload monitoring for the motor, and DC bus overvoltage/undervoltage protection.

• Maintenance and Monitoring Alerts: Functions like cumulative operation time alarm (RNT) and power-on time alarm (ONT) can be configured to provide early warnings for scheduled maintenance, such as cooling fan replacement, helping to prevent unplanned downtime.

• Safety Integration: The programmable safety inputs facilitate the implementation of safety functions like Safe Torque Off (STO), contributing to overall machine safety compliance.

Seamless Connectivity for Industry 4.0

• Built-in Communication Gateway: The standard RS-485 Modbus RTU port acts as a gateway for seamless integration into factory networks, enabling real-time monitoring, data logging, and remote control from a central SCADA or PLC system.

• Expanded I/O for Complex Logic: The generous number of programmable digital and analog I/O terminals allows the drive to be the central control node for a machine, interacting directly with sensors, relays, and other control elements.

Technical Specifications

Target Applications

The WJ200N-055HFC is engineered for a wide range of medium-power industrial applications, including:

• Material Handling Systems: Driving main conveyor lines, palletizers, and sorting systems in warehouses and distribution centers.

• Industrial Water Management: Controlling pumps for water supply, filtration, pressure boosting, and wastewater treatment plants.

• HVAC Systems: Operating large fans, pumps, and compressors in commercial and industrial heating and cooling systems.

• Processing Machinery: Providing reliable speed control for mixers, agitators, extruders, and other process equipment in the chemical, food, and pharmaceutical industries.

• Basic Hoisting and Winding Applications: Where its high starting torque and robust braking capabilities are essential.

Programming and Customization

The drive offers extensive programming capabilities for application-specific optimization:

• Dual Motor Configuration: Easily switch between two pre-configured motors with distinct parameters (H201-H204 group for the 2nd motor).

• PID Control with Sleep Function: The built-in PID can be configured with a sleep/wake function, which stops the motor when the process demand is very low (e.g., no flow) and restarts it when demand returns, maximizing energy savings.

• Programmable Fault Responses: Users can configure how the drive responds to specific faults, such as automatic reset and restart attempts, which is valuable in unattended or remote applications.

Safety and Conformity

The WJ200N-055HFC is designed and certified for global industrial use:

• CE Marked (Conforms to EU EMC and Low Voltage Directives)

• cULus Listed (UL 508C)

• RoHS Compliant

Conclusion

The Hitachi WJ200N-055HFC is a powerful and sophisticated industrial-grade variable frequency drive that brings the advanced control capabilities of the WJ200N series to a higher power bracket. Its combination of high torque performance, energy intelligence, flexible control options—including the valuable dual motor feature—and robust construction makes it an exceptional choice for a wide spectrum of demanding medium-power applications. It is more than just a motor controller; it is a comprehensive solution designed to enhance productivity, reduce operational costs, and ensure maximum reliability in challenging industrial environments. For engineers seeking a dependable, feature-rich drive for 5.5kW to 7.5kW applications, the WJ200N-055HFC stands as a testament to Hitachi's commitment to quality and innovation in industrial automation.