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Servo Amplifier 3.5 kW – MITSUBISHI MR-J2-350CT
The MR-J2-350CT is a servo amplifier (“Servo Amplifier”) from the MELSERVO-J2 series by Mitsubishi Electric, with a rated output of 3.5 kW. The CT suffix identifies a specific configuration variant of the base MR-J2-350 model, documented on CNC machine tools equipped with Mitsubishi servo motors on feed axes. The unit manages position, speed, and torque regulation loops, interfacing between the CNC controller and the servo motor via encoder feedback; it supports combined command modes (position/speed/torque). It belongs to the MELSERVO-J2 generation, predecessor to the MR-J2S, MR-J3, MR-J4, and MR-J5 lines.
The servo amplifier is the electronic power controller that converts motion commands from the CNC — position, speed, and torque references — into the three-phase current required to drive the axis servo motor. It closes the regulation loop at high frequency to ensure positioning accuracy and dynamic response. A fault in this component causes immediate axis shutdown: the machine cannot execute machining operations or positioning moves, and an alarm is triggered on the CNC unit.
Mitsubishi Electric is one of Japan’s leading industrial electronics manufacturers, with a leading position in factory automation, motion control, and CNC systems (MELDAS and MELSERVO lines). The MELSERVO-J2 series has been progressively superseded by the J2S, J3, J4, and J5 families; all MR-J2 products are currently legacy / discontinued: available only as used, NOS (new-old-stock), or through specialist repair services.
Main Technical Specifications
| Type | Servo drive / Servo amplifier |
| Part number | MR-J2-350CT (MRJ2350CT) |
| Brand | Mitsubishi Electric – MELSERVO-J2 series |
| Known application | CNC machine tools with Mitsubishi servo axes (MELDAS / MELSERVO systems) |
| Function | Servo motor position, speed, and torque control |
| Rated output power | 3.5 kW |
| Input voltage | Three-phase 200–230 V AC, 50/60 Hz |
| Rated output current | ~11–12 A continuous (typical) |
| Interfaces | CN1 (I/O, 50-pin), CN2 (encoder), CN3 (RS-232C / RS-422 parameter setting) |
| Encoder feedback | Pulse encoder (2500 p/rev) or Mitsubishi serial encoder |
| Control modes | Position (P), speed (S), torque (T) and combined P/S, S/T |
| Weight | ~3.5–5 kg |
| Dimensions | ~150×280×170 mm W×H×D |
| Production status | Legacy / discontinued — used / NOS / repair only |