Mitsubishi Electric MR-J4-500B-RJ Servo Drive

The Mitsubishi Electric MR-J4-500B-RJ servo drive is a high-performance AC servo amplifier that enables precise speed, torque, and position control for industrial automation. As part of the MELSERVO-J4 series, it delivers a 5.0 kW class output and accepts 200–230 VAC three-phase power. Control methods include pulse-train commands or SSCNET-III/H network communication, with high-resolution encoder feedback to support demanding positioning. Cooling is provided by a built-in fan with forced-air cooling, and mounting is suitable for panel or cabinet installations with overcurrent, overvoltage, and overtemperature safeguards plus status and fault LEDs for diagnostics. Common applications include CNC machining centers, gantry systems, pick-and-place equipment, material handling conveyors, and robotic axes where coordinated motion and high-speed responsiveness are essential. Maintenance teams and system integrators often use this drive for machine upgrades, retrofits, and replacement of failed or obsolete servo amplifiers. Common replacements listed are Mitsubishi MR-J4-500B, Mitsubishi MDS-B-SVJ2-40 servo drive, and Yaskawa SGDM-75ADA-series.