MR-J4-40B MELSERVO-J4 400W SSCNET III/H Servo Amplifier | Mitsubishi

The Original New Mitsubishi MR-J4-40B MELSERVO-J4 Series Servo Amplifier is a high-performance AC servo drive designed for precise motion control in industrial automation systems. Rated at 400W (0.4kW) with 200‑240V AC single‑phase or three‑phase input, this amplifier integrates SSCNET III/H high‑speed fiber‑optic communication for synchronized multi‑axis control. Built‑in dynamic brake and regenerative resistor, advanced vibration suppression control II, and one‑touch auto‑tuning simplify commissioning and reduce settling time. With support for 22‑bit high‑resolution absolute encoders and Safe Torque Off (STO) safety function, the MR-J4-40B is ideal for demanding applications in packaging, robotics, CNC machining, and semiconductor manufacturing.

Core Engineering Highlights:
400W (0.4kW) rated output | 2.8A rated current | 200‑240V AC single‑phase or three‑phase input (170‑264V range) | SSCNET III/H high‑speed fiber‑optic communication | Built‑in dynamic brake + regenerative resistor | STO (Safe Torque Off) safety function | 2.5 kHz speed frequency response | 22‑bit absolute encoder support | Advanced vibration suppression control II | One‑touch auto‑tuning | 40mm width | IP20 protection | 0°C to +55°C operating temperature | Natural cooling (fanless)

Key Features:

• Original New Mitsubishi MR-J4-40B amplifier

• 400W (0.4kW) rated output power

• 2.8A rated output current (2.9A with UL/CSA compliant motors under 3‑phase input)

• 200‑240V AC single‑phase or three‑phase input (170‑264V AC permissible range)

• DC input capability: 283‑340V DC

• SSCNET III/H high‑speed serial communication for synchronized multi‑axis control

• Position, speed, and torque control modes

• STO (Safe Torque Off) per IEC/EN 61800‑5‑2

• Built‑in dynamic brake and regenerative resistor

• 2.5 kHz speed frequency response for high‑performance motion control

• Advanced vibration suppression control II

• One‑touch auto‑tuning for simplified commissioning

• Tough drive function for continuous operation during temporary power failure

• Drive recorder function for fault data logging

• Machine diagnosis function for predictive maintenance

• J3 compatibility mode for easy replacement of MR‑J2S‑B systems

• 4 digital inputs (EM2, FLS, RLS, DOG) – 24V DC, sink/source

• 3 digital outputs (ALM, MBR, INP) – relay contact type

• 2 analog outputs (–10 to +10V DC, MO1 and MO2)

• 40mm width for space‑saving panel mounting

• Natural convection cooling (fanless)

• IP20 protection rating

Applications:

• Pick‑and‑place robotics and automated assembly systems

• Packaging machinery and labeling equipment

• CNC machine tools and precision positioning tables

• Semiconductor manufacturing and electronics assembly

• Multi‑axis synchronized motion control systems

• Material handling and conveyor systems

• General factory automation and OEM machinery

• Legacy MR‑J2S‑B system upgrades and spare part replacement

Technical Specifications:

Motor Compatibility:

• Compatible with Mitsubishi HG‑KR series (low inertia) and HG‑MR series (medium inertia) servo motors

• Recommended matching motors: HG‑KR43 (400W, 22‑bit absolute encoder), HG‑KR43B (with brake), HG‑MR43

• Supports 22‑bit absolute encoder feedback (battery‑backed position retention with MR‑BAT6V1SET)

System Compatibility:

• SSCNET III/H high‑speed fiber‑optic communication for multi‑axis synchronization with Mitsubishi motion controllers (Q17, Q170, Q172 series)

• J3 compatibility mode allows direct replacement for MR‑J2S‑B and MR‑J3‑B systems

• Parameter setting, tuning, and diagnostics via USB port using MR Configurator2 software

• For detailed wiring, connector pinout, and parameter setting, refer to the MR-J4‑B Instruction Manual

Related Products:

• HG‑KR43 – 400W low‑inertia servo motor with 22‑bit absolute encoder

• HG‑KR43B – 400W servo motor with electromagnetic brake

• HG‑MR43 – 400W medium‑inertia servo motor with 22‑bit absolute encoder

• MR‑J3BUS01M / MR‑J3BUS05M / MR‑J3BUS1M – SSCNET III/H fiber‑optic cables

• 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 Configurator2 – PC software for parameter setting, tuning, and diagnostics

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, MELSERVO, and SSCNET are trademarks of Mitsubishi Electric Corporation.