Mitsubishi MR-J2S-40A MELSERVO J2S 400W AC Servo Amplifier

Mitsubishi Electric MELSERVO J2-Super series MR-J2S-40A is a universal interface AC servo drive for precise motion control in industrial automation systems. Rated output 400 W (0.4 kW) at 200‑230 V AC, single‑phase or three‑phase input. Sine‑wave PWM control method with speed and torque control modes. Speed loop frequency response over 550 Hz for high‑speed positioning applications. Built‑in dynamic brake and natural cooling. 17‑bit absolute/incremental encoder feedback (131,072 pulses/revolution). This product is discontinued and available as a spare part for maintaining legacy MELSERVO J2S‑based systems.

Applications:

• High‑speed positioning for pick‑and‑place robotics and assembly systems

• CNC machine tools and automated production lines

• Semiconductor and electronics manufacturing equipment

• Packaging machinery and labeling equipment

Technical Specifications:

Core Specifications

• Rated output power: 400 W (0.4 kW)

• Rated output current: 2.8 A

• Supply voltage: 200‑230 V AC, 50/60 Hz (single‑phase or three‑phase input)

• Control methods: Sine‑wave PWM control, current control, speed control mode, torque control mode

• Control modes: Position, speed, torque

• Speed loop frequency response: ≥ 550 Hz

• Encoder feedback: 17‑bit absolute/incremental encoder (131,072 pulses/revolution)

• Built‑in dynamic brake: Yes

• Cooling method: Natural cooling (fanless)

• Protection functions: Overcurrent shut‑off, regeneration overvoltage shut‑off, overload shut‑off (electronic thermal), servo motor overheat protection, encoder fault protection, undervoltage/power outage protection, overspeed protection, excessive error protection

I/O & Interfaces

• Digital inputs: 9 (24 V DC, sink/source: EMG, LSP, LSN, SON, RES, PC/ST1/RS2, TL/ST2/RS1, SP2)

• Digital outputs: 3 (ALM, ZSP, TLC/VLC – relay contact type)

• Analog inputs: 1 × 0‑10 V DC (TLA/TC), 1 × –10 to +10 V DC (VC/VLA)

• Communication protocol: RS‑232C, RS‑422 (general‑purpose interface)

• Resolution: 17‑bit / 131,072 pulses/revolution encoder feedback input

Environmental & Physical

• Ambient operating temperature: 0 °C … +55 °C

• Storage temperature: –20 °C … +65 °C

• Operating humidity: 10 % … 90 % (non‑condensing)

• Altitude: 1,000 m max.

• Dimensions (W × H × D): 70 mm × 168 mm × 135 mm

• Weight: 1.13 kg (2.50 lbs)

• Enclosure rating: IP20

• Heat dissipation: 35 W at rated torque, 15 W powered off

Compatibility information:

• Compatible with Mitsubishi HC‑KFS series (low inertia) and HC‑MFS series (medium inertia) servo motors.

• Suitable mating motor: HC‑KFS43 (400 W, 17‑bit encoder).

• For detailed installation, wiring, connector pinout, and parameter settings, refer to the MR-J2S‑A Instruction Manual.

Product Status:
Discontinued. Mitsubishi Electric has discontinued the MELSERVO J2S series. Repair service is no longer available. For legacy system maintenance, this module remains available as a spare part while stocks permit. For new installations, use the recommended successor (MR‑J4‑40B).

Recommended Replacement:

• MR‑J4‑40B: MELSERVO‑J4 series 400 W servo amplifier with SSCNET III/H fiber‑optic communication, 22‑bit encoder support, advanced vibration suppression control, and one‑touch tuning. Requires complete drive and motor replacement; not directly compatible with existing wiring or control systems without migration considerations.

Related Products:

• HC‑KFS43 – 400 W low‑inertia servo motor with 17‑bit absolute encoder

• MR‑J4‑40B – Recommended replacement for new installations

• MR‑J2S‑40B – SSCNET interface version (fiber‑optic communication)

• MR‑J2S‑40A1 – 100 V AC single‑phase input version

• MR‑PWS1CBL2M‑A1 – 2 m motor power cable (IP65, standard bending life)