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

The Original New Mitsubishi MR-J2S-40A is a universal interface AC servo amplifier from the MELSERVO J2-Super series, designed for precise motion control in industrial automation systems. Rated at 400W (0.4kW) with 200–230V AC single-phase or three-phase input, it delivers reliable performance for a wide range of positioning applications. The amplifier features a sine-wave PWM control method with speed and torque control modes, achieving a speed loop frequency response of 550Hz or higher for high-speed positioning. Built-in dynamic brake, natural cooling, and a 17-bit absolute/incremental encoder interface (131,072 pulses/revolution) provide a robust motion control solution. This product is discontinued and available as a spare part for maintaining existing MELSERVO J2S-based systems. For new installations, the recommended replacement is the MR-J4-40A-RJ.

Core Engineering Highlights:
400W (0.4kW) rated output | 2.8A rated output current | 200–230V AC single-phase or three-phase input | Sine-wave PWM control / Current control method | Speed, torque, and position control modes | ≥550 Hz speed loop frequency response | 17-bit absolute/incremental encoder (131,072 pulses/revolution) | Built-in dynamic brake | Natural cooling (fanless) | 9 digital inputs + 3 relay outputs + 2 analog inputs | 70 × 168 × 135 mm dimensions | 1.13 kg weight | 0°C to +55°C operating temperature | IP20 protection rating

Key Features:

• Original New Mitsubishi MR-J2S-40A amplifier

• 400W (0.4kW) rated output power

• 2.8A rated output current

• 200–230V AC single-phase or three-phase input (170–253V AC permissible range for three-phase; 207–253V AC for single-phase 230V)

• Sine-wave PWM control method / Current control method

• Position, speed, and torque control modes (selectable)

• Speed loop frequency response: ≥550 Hz for high-speed positioning

• 17-bit absolute/incremental encoder feedback (131,072 pulses/revolution)

• Built-in dynamic brake

• Natural convection cooling (fanless)

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

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

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

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

• Compact 70 mm width for space-saving panel mounting

• IP20 protection rating

• Discontinued product available as a spare part

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

• General factory automation and OEM machinery

• Legacy system maintenance and spare part replacement for MELSERVO J2S-based configurations

Technical Specifications:

Position Control Mode:

Speed Control Mode:

Torque Control Mode:

Environmental & Physical:

Motor Compatibility:

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

• Recommended matching motors: HC-KFS43 (400W, 17-bit encoder), HC-MFS43

• Supports 17-bit absolute/incremental encoder feedback

• In absolute encoder mode, an external battery (MR-BAT6V1SET) is required for position retention during power-off

System Compatibility:

• Universal interface supports pulse train (differential line driver or open-collector) and analog voltage commands

• Parameter setting and monitoring via MR Configurator software using RS-422/RS-232C communication

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

Product Status:
Discontinued – Production of the MR-J2S series was discontinued in August 2015. This product remains available as a spare part for maintaining existing MELSERVO J2S-based systems while supplies last. For new installations, the recommended replacement is the MR-J4-40A-RJ.

Recommended Replacement:

• MR-J4-40A-RJ: MELSERVO-J4 series 400W servo amplifier with built-in dynamic brake, built-in regenerative resistor, and STO safety function. Supports 22-bit absolute encoder feedback with advanced vibration suppression control II and one-touch auto-tuning. The MR-J2 Super Renewal Tool allows staged migration while retaining existing HC-KFS/HC-MFS motors and existing wiring where applicable.

Related Products:

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

• HC-MFS43 – 400W medium-inertia servo motor with 17-bit absolute encoder

• MR-J4-40A-RJ – Recommended replacement (MELSERVO-J4 series)

• MR-BAT6V1SET – Battery for absolute encoder (for absolute position retention)

• MR-J3ENCBL2M-A1 – Encoder cable, 2m (standard bending life)

• MR-PWS1CBL2M-A1 – Power cable, 2m

• MR Configurator – PC software for parameter setting, monitoring, and tuning

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Mitsubishi and MELSERVO are trademarks of Mitsubishi Electric Corporation.