Mitsubishi MR-J4-70B MELSERVO-J4 750W SSCNET III/H Servo Amplifier

Mitsubishi Electric MELSERVO-J4 MR-J4-70B is a single‑axis AC servo amplifier for high‑precision motion control in industrial automation systems. Rated output 750 W (0.75 kW) at 200‑240 V AC, single‑phase or three‑phase input. SSCNET III/H high‑speed fiber‑optic communication interface for synchronized multi‑axis control. Built‑in dynamic brake, built‑in regenerative resistor, and STO (Safe Torque Off) safety function. Supports position, speed, and torque control modes with 22‑bit absolute encoder feedback. 60 mm width, IP20 enclosure, forced ventilation cooling. Suitable for precision motion control in packaging, machine tools, robotics, and automated assembly systems.

Applications:

• High‑speed positioning in CNC machine tools and precision machining equipment

• Multi‑axis synchronized motion control in automated assembly lines and pick‑and‑place robotics

• Semiconductor manufacturing and electronics assembly equipment

• Packaging machinery, labeling systems, and material handling systems

Core Specifications:

• Rated output power: 750 W (0.75 kW)

• Rated current: 5.8 A (continuous), maximum 15.0 A (3× peak)

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

• Control interface: SSCNET III/H (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) – SIL2 / PL e (EN ISO 13849‑1 Category 3, EN 62061)

• Built‑in dynamic brake: Yes

• Built‑in regenerative resistor: Yes

• Speed frequency response: 2.5 kHz (industry‑leading)

• Cooling method: Forced ventilation cooling (built‑in cooling fan)

• Enclosure rating: IP20

• Dimensions (W × H × D): 60 mm × 168 mm × 185 mm

• Weight: approx. 1.4 kg

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

I/O 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)

Protection Functions:
Overcurrent shut‑off, regenerative overvoltage shut‑off, overload shut‑off (electronic thermal), servo motor overheat protection, encoder fault protection, regenerative fault protection, undervoltage protection, instantaneous power failure protection, overspeed protection, excessive error protection, magnetic pole detection protection, linear servo control fault protection

Advanced Control Features:

• Advanced vibration suppression control II

• Adaptive filter II / robust filter

• Auto tuning / one‑touch tuning

• Tough drive function (continuous operation during temporary power failure)

• Drive recorder function (fault data logging)

• Machine diagnosis function

• Power monitoring function

• J3 compatibility mode

• Super trace control

• Lost motion compensation

Motor Compatibility:

• Compatible servo motors: Mitsubishi HG‑KR series (low inertia), HG‑MR series (medium inertia), HG‑SR series

• Compatible models: HG‑KR73, HG‑KR73J, HG‑MR73, HG‑SR72

• Recommended matching motor: HG‑KR73J (750 W, 22‑bit absolute encoder, straight shaft, IP65)

System Integration:

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

• SSCNET III/H high‑speed fiber‑optic communication enables multi‑axis synchronization with Mitsubishi Electric motion controllers.

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

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

• For absolute position retention during power‑off, an external battery (MR‑BAT6V1SET or A6BAT) is required.

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

Standards & Compliance:
CE, cULus, TÜV Rheinland, KC, EAC, UKCA, RoHS compliant

Related Products:

• HG‑KR73J – 750 W low‑inertia servo motor with 22‑bit absolute encoder, straight shaft, IP65

• HG‑MR73 – 750 W medium‑inertia servo motor with 22‑bit absolute encoder

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

• MR‑PWS1CBL2M‑A1 – Power cable, 2 m

• MR‑BAT6V1SET – Battery for absolute encoder

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