Product Description
The Mitsubishi MR-J2-40C, a MELSERVO MR-J2 series servo system, delivers high-performance control via sine-wave PWM and current control, operating on 200-230VAC (three-phase) or 230VAC (single-phase) at 50/60Hz with a 5% frequency fluctuation tolerance. It features a 250Hz minimum speed frequency response, an integrated dynamic brake, and an open enclosure (IP00) designed for air circulation in robust environments, requiring protection from moisture and dust. Operating within 0-55C and up to 90% humidity (non-condensing), it can be stored between -20 and 65C (non-freezing). Supporting single-axis positioning with a 3-point table, it communicates via DI/O and RS-422, and accommodates absolute position encoders for enhanced precision.
Is Your Device Showing These Signs?
The Mitsubishi MR-J2-40C servo amplifier commonly requires repair due to issues stemming from power supply failures, often indicated by alarm codes. Overcurrent faults, caused by shorted transistors or motor winding insulation breakdown, necessitate component replacement and motor inspection. Communication errors, resulting from damaged encoder cables or faulty RS-422/RS-485 interfaces, demand cable replacement and interface IC repair. Overheating, triggered by inadequate cooling or excessive load, leads to thermal sensor malfunction and drive shutdown. Address these issues by replacing faulty components, ensuring proper ventilation, and verifying motor integrity.
Technical specifications
The Mitsubishi MR-J2-40C MELSERVO is a high-performance servo system (200-230VAC) with sine-wave PWM, current control, a 250Hz speed frequency response, and a built-in dynamic brake. It's an open enclosure (IP00) device operating in 0-55C (up to 90% humidity) and supports single-axis positioning, DI/O, RS-422, and absolute encoders.
Our Repair Process for the
MR-J2-40C
Our repair process for the Mitsubishi MR-J2-40C servo amplifier begins with diagnosing the specific fault indicated by alarm codes, with power supply failures being a common cause. Overcurrent faults are addressed by replacing shorted transistors and inspecting the motor for winding insulation breakdown. Communication errors require immediate cable replacement and repair of faulty RS-422/RS-485 interface ICs. Overheating issues are resolved by replacing malfunctioning thermal sensors, ensuring proper ventilation, and verifying the motor's operational integrity. These steps guarantee a comprehensive restoration of the servo amplifier's functionality.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.


Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.
Buying Options
To receive a quote within 2 hours, please provide us with the details of your requirements. Our team will promptly review your request and send you a custom offer.
Ships from Rochester, NY