Mitsubishi Electric MR-J2S-40A Servo Amplifier

The Mitsubishi Electric MR-J2S-40A AC servo amplifier drive is a 400 W closed-loop servo controller in the MELSERVO J2-Super series, providing precise position, speed, and torque control for Mitsubishi servo motors. It accepts 200–230 V AC input (single- or three-phase), is panel-mount, uses encoder feedback, and offers automatic real-time auto-tuning to optimize motion accuracy. Typically paired with Mitsubishi HC-MFS or HC-KFS motors, it is used in CNC machinery, robotics, packaging systems, conveyor indexing, and automated assembly equipment. Protection features include overcurrent, overvoltage, overload, and fault diagnostics; the manufacturer part number is MR-J2S-40A (MRJ2S40A), and common replacements include MR-J4-40A, MR-JE-40A, and Yaskawa Sigma-5 400W drives.