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Mitsubishi MR-J2/J2S to MR-J4 Servo Migration Kits

Upgrade Legacy Servo Systems with Pre-Packaged Migration Kits

Many facilities still rely on Mitsubishi MR-J2 or MR-J2S servo systems to keep critical equipment running. However, as these legacy systems continue to age, replacement parts can become harder to find. As a result, relying on used or refurbished components may increase the risk of unreliable repairs, unexpected downtime, and costly production interruptions.

Shepherd Controls helps simplify the move to MR-J4 technology with Pre-Packaged Migration Kits for A-Type and B-Type amplifier applications. These kits are designed to make the upgrade process easier, reduce installation challenges, and support a smoother transition with less disruption to production.

With the right migration kit, you can:

Reuse existing wiring with conversion cables that help reduce rerouting and rewiring
Simplify installation with drop-in mounting compatibility
Support accurate parameter conversion to help maintain system performance
Plan ahead for aging servo equipment and reduce the risk of unplanned downtime

Request Your Migration Kit

Simplify MR-J2/J2S to MR-J4 Upgrades with Complete Migration Kits

Shepherd Controls helps make MR-J2/J2S to MR-J4 upgrades easier to plan with Mitsubishi Servo Migration Kits built for active production environments. Each kit brings together the components needed to simplify the migration, including pre-packaged hardware, exact-fit amplifier options, conversion cables, and flexible motor planning.

These kits help reduce wiring changes, shorten installation time, and support accurate parameter setup, making it easier to modernize aging servo systems while reducing guesswork, downtime risk, and production interruptions.

Download the Servo Migration Guide

Pre-Packaged Convenience

Each kit includes the key components needed for your upgrade, including the amplifier, conversion cables, and motor when required. This helps simplify ordering with one part number and makes inventory planning easier.

Conversion Cables Included

Included conversion cables allow you to keep existing wiring in place. This helps reduce rerouting, rewiring, installation time, and potential wiring errors during the upgrade.

Exact Fit & Mounting Compatibility

MR-J4 amplifiers align with the mounting patterns of existing MR-J2/J2S units, helping support a drop-in replacement that simplifies installation and reduces downtime.

Expert Support

Shepherd Controls provides guidance for parameter conversion, startup, and troubleshooting to help support a smoother migration. Most support is available at no cost during normal business hours within our APR region.

Fast, Reliable Upgrades

Pre-configured kits and parameter conversion tools help make the move from MR-J2/J2S to MR-J4 faster and more efficient, reducing production interruptions during the upgrade.

Flexible Motor & Amplifier Options

Amplifiers can be replaced separately from the motor, giving you flexibility for staged upgrades or backup kit planning. If a motor needs to be replaced, the corresponding amplifier must also be replaced to maintain proper operation and system performance.

Complete Mitsubishi Servo Migration Kits for MR-J4 Upgrades

A-Type Amplifier Kit: MR-J4-A

Kit Contents

Servo Amplifier
Encoder Conversion Cable
I/O Conversion Cable (I/O cable require external 24VDC)
Monitor Conversion Cable

Benefits

Use Your Existing Wiring
Keep your current MR-J2/J2S wiring intact with the MR-J4-A kit. No rerouting or rewiring is required, saving installation time, reducing errors, and minimizing production downtime.
Parameter Conversion Included for Fast Startup
The kit includes MR-J2/J2S to MR-J4 parameter conversion, ensuring your servo system operates correctly immediately. Pre-configured settings preserve motion profiles and operational parameters, making the upgrade fast, reliable, and efficient.
Same Dimensions & Mounting as Old Amplifiers
MR-J4-A amplifiers match the size and mounting patterns of your existing MR-J2/J2S units. This drop-in compatibility simplifies installation, prevents cabinet modifications, and reduces overall downtime for industrial automation systems.

Migration Summary

Upload parameters from old amplifier
Replace old amplifier with new amplifier in the cabinet
Connect existing cables to new conversion cables
Download converted parameters to new amplifier
Power up amplifier
Ready for operation

Instructions

Upload parameters from old servo amplifier
Convert parameters (Full detail instructions will be provided)
Disconnect existing cables from old servo amplifier and remove amplifier from cabinet (Make sure existing cables are labeled appropriately (they will be reconnected to new amplifier)
Mount MR-J4 amplifier in the cabinet (MR-J4 amplifiers have the same dimensions for mounting)
Connect IO, Encoder, and Monitor conversion cables to the MR-J4-A amplifier
Connect existing cables to their respective conversion cables
(If using on-board IO) – Connect 24VDC to the 2-pin (red/white) breakout connector on IO conversion cable
Power up new MR-J4-A amplifier
Download the converted parameters to the new MR-J4-A amplifier
Cycle power on MR-J4-A amplifier
Home servo amplifier
Ready to begin normal operation

B-Type Amplifier Kit: MR-J4-B

Kit Contents

Servo Amplifier
Encoder Conversion Cable
I/O Conversion Cable (I/O cable require external 24VDC)
Network Conversion Module

Benefits

No Program Changes Required
The MR-J4-B amplifier comes pre-configured in MR-J2S compatibility mode. This eliminates the need for any programming adjustments, allowing your system to operate immediately after installation.
Pre-Configured for MR-J2S Compatibility
Designed specifically to match MR-J2S parameters, the B-Type kit ensures a seamless transition to MR-J4 without altering your existing motion profiles, safety limits, or operational settings.
Quick Swap with Minimal Downtime
Drop-in design and conversion modules allow a fast replacement of old amplifiers. This reduces installation time and keeps production lines running smoothly, minimizing downtime and maintaining efficiency in industrial operations.

Migration Summary

Attach SSCNET adapter module to the side of the new amplifier
Replace old amplifier with new amplifier in the cabinet
Connect existing cables to new conversion cables
Power up amplifier
Ready for operation

Instructions

Disconnect existing cables from old servo amplifier and remove amplifier from cabinet (Make sure existing cables are labeled appropriately [they will be reconnected to new amplifier])
Attach the SSCNET adapter module to the side of the MR-J4-B amplifier (The male socket on the side of the SSCNET module connects to the female socket on the side of the amplifier)
Mount MR-J4-B amplifier in the cabinet (MR-J4-B amplifiers + adapter module have the same dimensions for mounting )
Connect IO, Encoder, and Monitor conversion cables to the MR-J4-B amplifier (if using)
Connect existing cables to their respective conversion cables
(If using on-board IO) – Connect 24VDC to the 2-pin (red/white) breakout connector on IO conversion cable
Power up new MR-J4-B amplifier
Home servo amplifier
Ready to begin normal operation

Technical Considerations for Migration Kits

Separate Amplifier and Motor Kits

Flexible Upgrades: Upgrade the amplifier while keeping the existing motor in place, making it easier to plan phased migrations or maintain backup kits.
Motor Replacement Requirement: If a motor is replaced, the matching amplifier must be replaced as well because MR-J4 motors use higher encoder resolution.
Compatibility Assurance: MR-J2/J2S amplifiers cannot read MR-J4 motor feedback, so pairing the correct motor and amplifier helps ensure reliable system performance.
Minimized Downtime: Separate kit options help you plan upgrades more efficiently while reducing disruption to production.

Parameter Conversion with MR‑Configurator2

What It Does: MR-Configurator2 converts existing MR-J2/J2S amplifier parameters into the MR-J4 format to help ensure the servo system operates correctly after the upgrade.
No License? No Problem: If you do not have MR-Configurator2, you can send Shepherd Controls your existing parameter file and our team can complete the conversion for you.
Why It Matters: Accurate parameter conversion helps preserve motion profiles, safety limits, and operating settings while reducing the risk of startup errors or unexpected downtime.
Ease and Confidence: Whether parameters are converted in-house or with support from Shepherd Controls, the process helps make your MR-J4 upgrade smooth, efficient, and reliable.

CP/CL Model Considerations

What It Does: MR-Configurator2 converts existing MR-J2/J2S amplifier parameters into the MR-J4 format to help ensure the servo system operates correctly after the upgrade.
No License? No Problem: If you do not have MR-Configurator2, you can send Shepherd Controls your existing parameter file and our team can complete the conversion for you.
Why It Matters: Accurate parameter conversion helps preserve motion profiles, safety limits, and operating settings while reducing the risk of startup errors or unexpected downtime.
Ease and Confidence: Whether parameters are converted in-house or with support from Shepherd Controls, the process helps make your MR-J4 upgrade smooth, efficient, and reliable.

Identify Your MR-J2S Models Before You Upgrade

Confirm your current servo system before planning the move to MR-J4 technology. The complete MR-J2S Motors and Amplifiers list includes compatible models across A, B, CP, and CL series, making it easier to identify your units, plan the right migration path, and order the correct kit.

Download the list to simplify upgrade planning, reduce guesswork, and support a faster, more confident servo migration with less downtime.

Download the full MR-J2S Parts List

Plan Your MR-J4 Migration with Confidence

Moving from MR-J2/J2S to MR-J4 technology can raise questions about compatibility, wiring, parameter conversion, and installation. Get clear guidance to help you choose the right kit, complete the conversion process accurately, and move through your upgrade efficiently while helping keep production online.

Is my MR-J2 or MR-J2S system compatible with a migration kit?
Shepherd Controls can support Mitsubishi MR-J2 and MR-J2S servo migrations across A, B, CP, and CL series. A-Type and B-Type applications are the most common, while CP and CL models may require additional review because of advanced positioning methods or specialized settings.

Can I upgrade the amplifier and keep my existing motor?
In many cases, yes. Amplifiers can often be replaced while keeping the existing motor in place, which can support phased upgrades or backup kit planning. However, if the motor is being replaced, the matching amplifier must also be replaced because MR-J4 motors use higher encoder resolution.

Will I need to rewire the system?
No. Mitsubishi Servo Migration Kits include conversion cables that allow you to keep existing wiring in place. This helps reduce rerouting, rewiring, installation time, and potential wiring errors during the upgrade.

Will the MR-J4 amplifier fit where my current MR-J2/J2S amplifier is installed?
Yes. MR-J4 amplifiers are designed to match the size and mounting patterns of existing MR-J2/J2S units. This drop-in compatibility helps simplify installation, avoid cabinet modifications, and reduce downtime.

How does parameter conversion work?
For A-Type migrations, MR-Configurator2 software converts existing MR-J2/J2S amplifier parameters into the MR-J4 format. If you do not have MR-Configurator2, you can send Shepherd Controls your parameter file and our team can complete the conversion for you. For B-Type migrations, the MR-J4-B amplifier comes pre-configured in MR-J2S compatibility mode.

What support does Shepherd Controls provide during migration?
Shepherd Controls can help with kit selection, parameter conversion, startup guidance, and troubleshooting. Our team can review your current setup, identify the correct migration kit, and support the technical details needed for a smoother upgrade.

Can I order spare migration kits for future use?
Yes. Migration kits can be ordered for planned upgrades, critical machines, or backup inventory. Because each kit is packaged under a single part number, it is easier to simplify ordering, support spare parts planning, and prepare for aging servo system failures.

How do I know which migration kit I need?
Start by identifying your current MR-J2 or MR-J2S amplifier and motor models. Shepherd Controls can review your equipment information and help match your system to the correct MR-J4 migration kit for your application.

Mitsubishi Servo Migration Kits