The MR-J3-350A and MR-J3-350B belong to Mitsubishi’s MELSERVO‑J3 family of high‑performance AC servo amplifiers, designed to drive 3.5 kW 200 V‑class servo motors in demanding industrial applications such as CNC machines, packaging, printing, and general automation. Both models are 3‑phase 200–230 V units with a rated output of 3.5 kW and are capable of very fast response, with the MR‑J3 series offering speed loop frequency response up to about 900 Hz for high‑precision positioning and smooth speed control. The drives support advanced automatic tuning, vibration suppression, and high‑resolution encoder feedback (up to 18‑bit, 262,144 pulses/rev) to improve machine performance and reduce setup time.
MR-J3-350A uses a general‑purpose pulse interface (pulse train plus analog input) and is ideal for systems where the controller outputs step/direction or high‑speed pulse commands, along with ±10 V analog speed/torque references. Users can select position, speed, or torque control modes (P/S/T), or combine them, making the amplifier flexible for various motion profiles. MR-J3-350B, on the other hand, is the SSCNET III fiber‑optic network type, providing high‑speed serial communication with a communication cycle as fast as 0.44 ms and simplified wiring through optical fiber, which improves noise immunity and allows long‑distance multi‑axis networks (up to 50 m between nodes, up to 800 m/16 axes in total). Both types include comprehensive protection features such as overcurrent, regenerative overvoltage, overload, motor overheat, encoder fault, undervoltage, and overspeed alarms, helping ensure safe and reliable servo operation.
Technical Specifications
