MR-J4-40A MELSERVO-J4 400W AC Servo Amplifier | Mitsubishi Electric

The Original New Mitsubishi Electric MR-J4-40A is a 400 W (0.4 kW) AC servo amplifier from the MELSERVO-J4 series, designed for high-precision motion control in industrial automation systems. It features a built-in dynamic brake and built-in regenerative resistor, operating on a 200–240 V AC single-phase or three-phase supply. The amplifier uses a general-purpose interface supporting pulse train and analog command inputs, with RS-422/RS-485 serial communication capability for multi-axis control up to 32 axes. With a 2.5 kHz speed frequency response and support for Mitsubishi's high-resolution 22-bit absolute encoder (4,194,304 pulses/revolution), it delivers responsive and accurate motor control for machine tool feed axes, packaging machinery, and general industrial applications.

Core Engineering Highlights:
400 W (0.4 kW) rated output | 2.8 A rated current / 2.6 A input current | 200–240 V AC single-phase (2P) or three-phase (3P) input | 2.5 kHz speed frequency response | Built-in dynamic brake + built-in regenerative resistor | Safe Torque Off (STO) – IEC/EN 61800-5-2 | RS-422 / RS-485 communication (up to 32 axes) | 22-bit encoder support | IP20 protection | 0°C to +55°C operating temperature

Key Features:

• Original New Mitsubishi Electric MR-J4-40A servo amplifier

• 400 W (0.4 kW) rated output with 2.8 A rated current

• Single-phase (2P) or three-phase (3P) 200–240 V AC supply

• Built-in dynamic brake and built-in regenerative resistor for reduced external components

• 2.5 kHz speed frequency response for high-speed positioning

• Supports position, speed, and torque control modes

• Maximum input pulse frequency: 4 Mpps (differential receiver), 200 kpps (open-collector)

• 22-bit absolute encoder feedback (4,194,304 pulses/revolution)

• Advanced one-touch auto-tuning for fast commissioning

• Advanced vibration suppression control II, adaptive filter II, and robust filter

• Tough drive function, drive recorder function, machine diagnosis function, and power monitoring function

• RS-422 / RS-485 communication capability for multi-axis networking (up to 32 axes)

• USB port for PC connection (MR Configurator2 compatible)

• Natural cooling (fanless) for reduced maintenance

Applications:

• Machine tool feed axes and precision positioning

• Packaging machinery servo axes

• Conveyor positioning and material handling systems

• Industrial robotics and automated assembly

• General high-precision motion control applications

Technical Specifications:

System Compatibility:

• Compatible with Mitsubishi Electric MELSERVO-J4 series architecture. Drive model and firmware compatibility should be verified before installation.

• Verified compatible servo motors include: HG-KR43(B), HG-MR43(B), and equivalent HG series motors equipped with 22-bit absolute encoder

• Also compatible with HG-KR43(B)W0C functional safety motors when combined with MR-D30 functional safety unit

• Configuration via MR Configurator2 software (USB connection)

Related Products:

• HG-KR43J – 400 W low-inertia servo motor, 22-bit absolute encoder, oil seal

• HG-KR43 – 400 W low-inertia servo motor, 22-bit absolute encoder

• MR-J4-40B – 400 W servo amplifier with SSCNET III/H interface

• MR-J4-40GF – 400 W servo amplifier with fully closed loop control

• MR-J4W2-44B – 2-axis servo amplifier

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

• MR-PWS1CBL2M-A1 – Power cable, 2 m

• MR Configurator2 – PC software for parameter setting 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 Electric and MELSERVO are trademarks of Mitsubishi Electric Corporation.