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

Mitsubishi Electric MELSERVO-J4 MR-J4-40B is a high‑performance AC servo amplifier for precise motion control in industrial automation and OEM systems. Rated output 400 W (0.4 kW) at 200‑240 V AC, single‑phase or three‑phase input. Built‑in dynamic brake, regenerative resistor, and SSCNET III/H high‑speed fiber‑optic communication interface for synchronized multi‑axis control. Advanced vibration suppression control, one‑touch tuning, 22‑bit high‑resolution encoder support, and Safe Torque Off (STO) safety function. 40 mm width for space‑saving panel mounting, IP20 enclosure, natural cooling.

Applications:

• Multi‑axis motion control in automated assembly lines

• High‑speed CNC machining and robotics

• Semiconductor and electronics manufacturing equipment

• Precision packaging and pick‑and‑place systems

Core Specifications:

• Rated output power: 400 W (0.4 kW)

• Rated output current: 2.8 A

• Supply voltage: 200‑240 V AC, 50/60 Hz (single‑phase or three‑phase input)

• Control interface: SSCNET III/H (high‑speed fiber‑optic communication)

• Control modes: Position, speed, torque control

• Encoder feedback: 22‑bit absolute encoder (4,194,304 pulses/revolution)

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

• Built‑in dynamic brake: yes

• Built‑in regenerative resistor: yes

• Cooling method: Natural cooling (fanless)

• Enclosure rating: IP20

Advanced Specifications:

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

• Digital outputs: 3 (ALM – relay contact, MBR – relay contact, INP – relay contact)

• Analog outputs: 2 (–10 … +10 V DC, MO1 and MO2)

• Power consumption (control circuit): 30 W

• Input current consumption: 2.6 A

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

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

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

• Altitude: 1,000 m max.

• Vibration resistance: 5.9 m/s² (10 to 55 Hz)

• Certifications: CE, cULus, TÜV Rheinland, KC, UL 508C, EN 61800‑5‑2, EN 61800‑5‑1, EN 61800‑3, EN ISO 13849‑1 (PLe/Cat 3), EN 62061 (SILCL3)

• Dimensions (W × H × D): 40 mm × 168 mm × 170 mm

• Weight: approx. 1 kg

Motor Compatibility:

• Designed for Mitsubishi HG-KR and HG-MR series servo motors (400 W rating)

• Compatible with HG‑KR43, HG‑KR43BJ, HG‑MR43, and other 400 W low‑inertia / medium‑inertia servomotors

• Supports 22‑bit absolute encoder feedback (no battery backup required)

System Integration:

• This amplifier belongs to the Mitsubishi Electric MELSERVO-J4 series.

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

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

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

Cables & Accessories (optional, order separately):

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

• MR‑BTBLCBL02M‑B – Dynamic brake cable (external use)

• MR‑BKS1CBL03M‑A – Battery cable for absolute encoder (optional)