Description

HITACHI LUD700A Variable Frequency Drive

Product Description

The HITACHI LUD700A is an advanced, general-purpose variable frequency drive (VFD) from Hitachi’s L700 series, designed for precise speed and torque control of three-phase AC induction motors. While not a PLC I/O module itself, it is a critical and intelligent component in modern automation systems, directly interfacing with PLCs via digital and analog signals or industrial networks to execute complex motion profiles. The HITACHI LUD700A optimizes motor performance, enhances process control, and achieves significant energy savings by adjusting the motor’s frequency and voltage. Its compact and robust design is suitable for a wide range of industrial applications. For full technical documentation and application notes, please visit the official product page: HITACHI LUD700A. Integration of the LUD700A into a control system allows for dynamic adjustment of pump flows, fan speeds, and conveyor velocities directly from the PLC or a supervisory system. The drive’s built-in programmable logic and PID controller make the HITACHI LUD700A a powerful, flexible component for building efficient and responsive automation solutions.

Product Parameters

• Product Model: HITACHI LUD700A
• Series: Hitachi L700 Series General Purpose Drive.
• Power Rating: Available in a range of power ratings, typically from 0.4 kW to several hundred kW (specific rating is denoted by a suffix to the model, e.g., LUD700A-xxx).
• Input Voltage: Common three-phase voltage classes: 200-240V AC, 380-480V AC, 525-600V AC.
• Output Frequency Range: Typically 0.1 to 400 Hz (or 590 Hz with specific settings).
• Control Methods: V/f control, Open Loop Vector Control, and Closed Loop Vector Control (with encoder feedback option).
• Communication Interfaces: Built-in options for RS-485/Modbus RTU. Often equipped with slots for optional communication cards for Profibus DP, DeviceNet, Ethernet/IP, or CC-Link.
• Inputs/Outputs:
  • Digital Inputs: Multiple programmable inputs for commands like Run, Stop, Multi-speed selection.
  • Analog Inputs: 1 or 2 channels (0-10V, 4-20mA) for speed reference or PID feedback.
  • Relay/Transistor Outputs: For drive status (Running, Fault) or as programmable outputs.
• Built-in Features: PID controller, PLC-like programmable sequence function, dynamic torque vector control, and multiple braking options.

Advantages and Features

• Energy Saving Optimization: Features like Energy Saving Mode and Advanced Automatic Voltage Regulation (AVR) significantly reduce motor power consumption, especially in variable torque applications like fans and pumps.
• High Starting Torque: Provides 150% starting torque at 1 Hz in vector control mode, enabling reliable starts for conveyors and mixers under load.
• Easy Setup and Use: Equipped with a removable keypad with copy function and an intuitive programming software (Hitachi Drive Programming Tool) for quick commissioning and parameter management.
• Robust Design and Protection: Features a heavy-duty design with high corrosion resistance coating, built-in EMC filter, and comprehensive protection against overload, overvoltage, undervoltage, and ground faults.
• Flexible Connectivity: The slot for an optional communication card allows for easy integration into virtually any major industrial network, making the HITACHI LUD700A a versatile choice for networked control architectures.

Application Cases in Various Fields

• HVAC Systems: Controls the speed of chilled water pumps, cooling tower fans, and air handling unit (AHU) fans in commercial buildings, optimizing comfort and energy use.
• Water Treatment: Manages the speed of raw water intake pumps, effluent pumps, and aerators in oxidation ditches, matching flow to demand and reducing energy costs.
• Material Conveying: Provides soft-start and precise speed control for long conveyor belts in mining or packaging facilities, reducing mechanical stress and improving material handling.
• Plastic Extrusion Lines: Controls the speed of the extruder screw motor, ensuring consistent material feed and product quality by maintaining precise torque.

Comparison with Competing Products

The HITACHI LUD700A competes directly with general-purpose drives like the Mitsubishi FR-D700, Siemens SINAMICS V20, and Danfoss FC-102. Its key advantages often include a strong focus on energy efficiency algorithms and a robust, compact mechanical design. Compared to basic V/f drives, the LUD700A offers superior vector control performance for more demanding applications. When stacked against more expensive flux vector drives, it provides an excellent balance of performance, features, and cost for the vast majority of general industrial applications. The availability of various communication options makes it as integrable as many higher-end drives.

Selection Suggestions and Precautions

1. Motor and Load Matching: Precisely match the HITACHI LUD700A drive’s output current and voltage rating to the nameplate specifications of your motor. The drive’s kW rating should be equal to or greater than the motor’s rated power. Consider the load type (constant torque vs. variable torque) for correct sizing.
2. Required Control Performance: Determine if your application requires basic speed control (V/f mode) or higher performance like constant torque at low speed (Vector Control). This affects both the drive selection and parameter setup.
3. Network Integration Planning: If connecting to a PLC network, select the correct optional communication card (Profibus, Ethernet/IP, etc.) at the time of purchase and plan for the necessary configuration in both the drive and the PLC.
4. Harmonics and EMC Considerations: For installations on sensitive power networks, consider adding an AC reactor or harmonic filter to meet standards. Always follow EMC guidelines for proper installation, including using shielded motor cables and correct grounding to minimize electrical noise.

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