Product Description
The Mitsubishi MR-J2M-BU4 base unit, weighing 1.1 kg, is a versatile and essential component for servo system integration, supporting up to 1600W servo motors and providing 1280W continuous processing. Featuring four slots, it accepts 200-230VAC in both 3-phase and 1-phase configurations at 50/60Hz (5%), with inrush current ratings of 20A (control) and 62.5A (main). Designed for storage temperatures of -20 to 65C and operational temperatures of 0 to 55C, it seamlessly integrates with MR-J2M drives and interface units for enhanced system efficiency.
Is Your Device Showing These Signs?
The Mitsubishi MR-J2M-BU4 commonly experiences communication errors stemming from corrupted CC-Link IE Field Network configurations or faulty terminations, requiring meticulous parameter verification and proper network topology implementation. Drive malfunctions often arise from IGBT failures or capacitor degradation within the servo amplifier, necessitating component-level repairs or complete unit replacement. Overcurrent faults are frequently traced to shorted motor windings or incorrect gain adjustments, mandating motor insulation testing and servo parameter optimization. Encoder feedback issues manifest as positioning inaccuracies, demanding encoder signal integrity checks and potential encoder replacement. Power supply failures due to component aging or voltage fluctuations are addressed through power module repair or power supply unit exchange.
Technical specifications
The Mitsubishi MR-J2M-BU4 base unit (1.1 kg) supports up to 1600W servo motors with 1280W continuous processing, featuring four slots and accepting 200-230VAC (1/3-phase, 50/60Hz). It operates between 0-55C (storage: -20 to 65C) and integrates with MR-J2M drives for system efficiency.
Our Repair Process for the
MR-J2M-BU4
Our repair process for the Mitsubishi MR-J2M-BU4 begins with a thorough diagnostic assessment to pinpoint the root cause of the failure. Communication errors are resolved through meticulous verification of CC-Link IE Field Network parameters and ensuring correct network topology implementation. Drive malfunctions stemming from IGBT failures or capacitor degradation are addressed via component-level repairs or complete unit replacement. Overcurrent faults necessitate motor insulation testing and servo parameter optimization to rectify shorted motor windings or incorrect gain adjustments. Encoder feedback issues are resolved through encoder signal integrity checks and potential encoder replacement to eliminate positioning inaccuracies. Power supply failures are addressed through power module repair or power supply unit exchange to counteract component aging or voltage fluctuations.
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