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Hitachi inverter calibration troubleshooting guide

ISO 9001:2015 Certified Quality

Our certified process ensures consistent quality and reliable repairs every time.

2-Year Repair Warranty

We stand behind our repairs with an extensive 2-year warranty on parts and labor for your peace of mind.

Fast Turnaround Time

Our efficient process and large parts inventory help minimize your operational downtime.

Expert Component-Level Repair

We find and replace individual failed components, offering a more affordable and effective repair than full replacement.

Free, No-Obligation Quote

Send us your item for a free evaluation and receive a detailed repair quote with no commitment required.

Hitachi Inverter Repair Services by Roc Industrial LLC

Is your Hitachi inverter malfunctioning? Roc Industrial LLC specializes in providing fast, reliable, and expert Hitachi inverter repair services to get your equipment back up and running quickly. We understand the critical role Hitachi inverters play in various industrial applications, and our experienced technicians are equipped to diagnose and repair a wide range of issues. Trust Roc Industrial LLC as your trusted partner for all your Hitachi inverter service needs. We offer comprehensive testing, refurbishment, and troubleshooting to ensure optimal performance.



About Hitachi Inverters

Hitachi is a globally recognized brand known for its high-quality and innovative industrial automation solutions, including their robust line of inverters. Hitachi inverters are designed to control the speed and torque of AC motors, providing precise control and energy efficiency in a variety of applications. These inverters are widely used in industries such as manufacturing, robotics, HVAC, and water treatment, where reliable motor control is essential for optimal performance and productivity.


Hitachi inverters are renowned for their advanced features, durability, and ease of use. They offer a range of functionalities, including sensorless vector control, built-in PLC functionality, and network communication capabilities, making them suitable for both simple and complex applications. With a strong reputation for quality and reliability, Hitachi inverters are a popular choice for businesses seeking to improve their operational efficiency and reduce energy consumption. However, like any electronic equipment, Hitachi inverters can experience failures over time, requiring expert repair and maintenance services.



Supported Models & Series

We repair a wide range of Hitachi inverter models and series, including but not limited to:

  • Hitachi WJ200 Series

  • Hitachi SJ700 Series

  • Hitachi X200 Series

  • Hitachi SJ300 Series

  • Hitachi WJ200N Series

  • Hitachi NES1 Series

  • Hitachi L300P Series

  • Hitachi SJ550 Series

  • Hitachi Vector Series

  • Hitachi E Series

  • Hitachi NF Series

Our expertise extends to various horsepower ratings and voltage configurations within these series. If you don't see your specific model listed, please contact us – we likely support it!



Common Hitachi Inverter Problems We Repair

Hitachi inverters, while reliable, can experience various issues that can disrupt your operations. Our experienced technicians are skilled in diagnosing and repairing a wide range of common Hitachi inverter failures.

  • No Output: The inverter fails to provide any output voltage or current to the motor.

  • Overvoltage/Overcurrent Faults: The inverter trips due to excessive voltage or current levels.

  • Communication Errors: The inverter is unable to communicate with the control system or other devices.

  • Overheating: The inverter overheats due to excessive load, inadequate cooling, or component failure.

  • Blown Fuses: Fuses within the inverter blow due to short circuits or component failures.

  • Encoder Faults: Issues with the encoder feedback signal, leading to inaccurate motor control.

  • Drive Won't Start: The inverter fails to power on or initiate operation.

  • Inconsistent Speed Control: The motor speed fluctuates or does not match the setpoint.

  • Display Issues: The inverter display is blank, shows errors, or is unreadable.

  • Parameter Corruption: Inverter parameters are lost or corrupted, leading to incorrect operation.

  • Ground Faults: Leakage current to ground, indicating insulation breakdown.

  • IGBT Failures: Failure of the Insulated Gate Bipolar Transistors (IGBTs), critical power switching components.


Our Hitachi Inverter Repair Process

Roc Industrial LLC follows a comprehensive and meticulous repair process to ensure the highest quality Hitachi inverter repairs:

  1. Free Evaluation and Quote: We offer a free evaluation of your faulty Hitachi inverter to determine the extent of the damage and provide you with a detailed repair quote.

  2. Shipping Instructions: Once you approve the quote, we provide clear and concise shipping instructions to ensure your inverter arrives safely at our repair facility.

  3. Diagnosis Using Specialized Test Equipment: Our experienced technicians use advanced diagnostic equipment to pinpoint the root cause of the inverter failure. This includes thorough testing of all critical components and circuits.

  4. Component-Level Repair and Replacement: We perform component-level repairs, replacing faulty components with high-quality replacements. We stock thousands of parts to expedite the repair process.

  5. Load Testing and Quality Checks: After the repair is complete, we subject the inverter to rigorous load testing to ensure it performs flawlessly under real-world operating conditions. We conduct thorough quality checks to verify that all parameters are within specifications.

  6. Warranty-Backed Return and Support: We back our Hitachi inverter repairs with a comprehensive warranty, giving you peace of mind. We also provide ongoing technical support to address any questions or concerns you may have.


Nationwide Repair Services

Roc Industrial LLC provides Hitachi inverter repair services to customers nationwide. Whether you are located in New York, Los Angeles, Chicago, Houston, Dallas, or any other city across the United States, we are here to help. We offer fast shipping options and quick turnaround times to minimize downtime and get your operations back on track as quickly as possible.


We understand the urgency of industrial equipment repairs. Our streamlined processes and efficient logistics ensure that your Hitachi inverter is repaired and returned to you promptly, regardless of your location.



Why Choose Roc Industrial LLC?
  • 30+ Years of Experience: We have over 30 years of experience in industrial electronic repair, including extensive expertise in Hitachi inverters.

  • Warranty-Backed Repairs: All our Hitachi inverter repairs are backed by a comprehensive warranty, ensuring your satisfaction.

  • Thousands of Parts in Stock: We maintain a large inventory of Hitachi inverter parts, allowing us to expedite repairs and minimize downtime.

  • Fast Turnaround, Often Same-Day: We understand the importance of minimizing downtime, and we offer fast turnaround times, often with same-day service available.

  • ISO-Certified Repair Processes: Our repair processes are ISO-certified, ensuring the highest standards of quality and reliability.

  • Exceptional Customer Support: Our dedicated customer support team is available to answer your questions and provide assistance throughout the repair process.

Don’t let a faulty Hitachi inverter slow down your operations. Contact Roc Industrial LLC today for a free evaluation and fast, reliable Hitachi inverter repair. We are your trusted partner for all your Hitachi inverter service and troubleshooting needs.

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