Hitachi WJ200N-015HFC Inverter The Ultimate Variable Frequency Drive for Small Conveyors and Fans

Hitachi WJ200N-015HFC Inverter

The Hitachi WJ200N-015HFC represents a sophisticated and highly adaptable variable frequency drive engineered for precision control of three-phase AC induction motors. Designed to meet the rigorous demands of modern industrial applications, this inverter combines advanced technology, user-centric design, and robust construction to deliver exceptional performance, energy efficiency, and operational reliability. With a power rating of 1.5 kW (2 HP) in constant torque (CT) mode and 2.2 kW (3 HP) in variable torque (VT) mode, it is particularly well-suited for applications such as small conveyors, pumps, fans, and automated machinery where space, efficiency, and control accuracy are critical.

Distinguishing Characteristics and Capabilities

Precision Motor Performance

The WJ200N-015HFC leverages Hitachi's advanced control algorithms to achieve superior motor performance:

• Enhanced Sensorless Vector Control (SLV): Provides exceptional low-speed torque performance (200% starting torque at 0.5 Hz), enabling precise control even under challenging load conditions without the need for a feedback encoder.

• Flexible V/F Control Modes: Offers multiple pre-set V/F patterns (constant torque, variable torque for fan/pump applications) and supports user-defined V/F curves for specialized motor types or unique application requirements.

• On-Demand Auto-Tuning: The drive can automatically identify and configure key motor parameters (such as stator resistance and inductance) at standstill, ensuring optimized performance and stability from startup.

Operational Efficiency and Energy Management

• Intelligent Energy Optimization: The inverter’s energy-saving algorithm continuously monitors the motor load and dynamically adjusts the output voltage to minimize magnetizing losses, resulting in significant power savings during light-load operation—a critical feature for applications like ventilation fans or pumping systems with variable demand.

• Regenerative Braking Support: While an external braking unit is optional, the drive is prepared to handle regenerative energy, which can be dissipated through a connected resistor, enabling faster deceleration and reducing cycle times.

Intuitive Operation and Advanced Programmability

• The integrated digital operator features a clear 4-digit LED display and responsive membrane keys, allowing for straightforward parameter configuration, real-time monitoring of operational data (output frequency, current, status), and quick fault diagnosis.

• Diverse Control Inputs: Supports frequency command sources including the built-in potentiometer, external analog inputs (0-10V or 4-20mA), digital terminals for multi-step speed control (16 steps), pulse train input, and communication-based commands via Modbus.

• Built-in PID Controller: Facilitates closed-loop process control for maintaining variables like pressure, flow, or temperature, eliminating the need for an external PID controller.

Integrated Protection and Safety Functions

• A comprehensive suite of protective functions safeguards both the inverter and the motor: Overcurrent (OC), Overvoltage (OV), Undervoltage (UV), Electronic Thermal Overload Relay, Motor Overload (OL), Ground Fault (GF), and Heatsink Overheat (OH) protection.

• Safety Torque Off (STO) Compliant: The drive offers configurable safety inputs that can be wired to a safety relay to implement Safe Torque Off functionality, helping machines comply with international safety standards (e.g., IEC 61800-5-2) by preventing unintended motor operation.

• DC Injection Braking: Provides a controlled method for quickly holding a load, useful for applications requiring rapid stopping without a mechanical brake.

Seamless System Integration

• Modbus RTU Standard: The built-in RS-485 interface enables easy and cost-effective integration into supervisory control and data acquisition (SCADA) systems, programmable logic controllers (PLCs), and building management systems (BMS).

• Expandable Connectivity: Optional communication cards (e.g., for Profibus-DP, DeviceNet, or Ethernet/IP) are available for integration into virtually any industrial network architecture.

• Versatile I/O Structure: Multiple programmable digital inputs and outputs, along with analog inputs and a relay output, provide the flexibility to interface with a wide array of sensors, switches, and control devices.

Technical Specifications

Target Applications

The versatility of the WJ200N-015HFC makes it an ideal solution for a diverse range of applications:

• HVAC Systems: Controlling fans and pumps in commercial building ventilation, heating, and cooling systems for improved comfort and energy savings.

• Water and Wastewater Treatment: Precisely controlling pump speed in filtration, chemical dosing, and aeration processes.

• Material Handling: Driving conveyors, sorting systems, and elevators where smooth starting and stopping are essential.

• Food and Beverage Machinery: Operating mixers, agitators, and conveyor belts within processing and packaging lines.

• General Industrial Machinery: Providing reliable speed control for machine tools, compressors, and textile machinery.

Programming and Customization

The inverter's parameters are organized into logical groups (A: Standard, B: Fine Tuning, C: Terminal, etc.), simplifying the setup process. Key programming features include:

• Multi-Function Inputs/Outputs: Each terminal can be assigned a specific function from a extensive list (e.g., Jog, Reset, 3-Wire Control, Alarm Output).

• PID Control Setup: Easy configuration of setpoint source, feedback source, and gain settings for process loop applications.

• Acceleration/Deceleration Control: Independent setting of four different acceleration and deceleration patterns with S-curve characteristics to minimize mechanical stress.

• Programmable Skip Frequencies: Prevents the drive from operating at frequencies that could excite mechanical resonances in the system.

Safety and Conformity

The WJ200N-015HFC is designed and tested to comply with major international standards:

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

• cULus Listed (UL 508C)

• RoHS Compliant

Its design incorporates safety-focused features such as:

• A dedicated Earth (Ground) terminal for safety grounding.

• Transient voltage suppression on control circuits.

• Password protection to prevent unauthorized parameter changes.

Conclusion

The Hitachi WJ200N-015HFC is a compact yet powerful and intelligent variable frequency drive that offers an outstanding blend of precise motor control, energy efficiency, and application flexibility. Its comprehensive feature set, coupled with robust protective functions and ease of use, makes it a superior choice for engineers and system integrators looking to enhance system performance, reduce energy consumption, and ensure reliable operation in a wide array of 1.5kW to 2.2kW applications. It embodies Hitachi's commitment to quality and innovation in industrial automation.