Mitsubishi MR-J4-40A MELSERVO-J4 400W Universal Interface Servo Amplifier

Mitsubishi Electric MELSERVO-J4 MR-J4-40A is a general-purpose AC servo amplifier for precise motion control in industrial automation systems. Rated output 400 W (0.4 kW) at 200‑240 V AC, single-phase or three-phase input. Sine‑wave PWM control method with position, speed, and torque control modes. Supports pulse train commands up to 4 Mpps (differential) or 200 kpps (open‑collector). Built‑in dynamic brake, built‑in regenerative resistor, and STO (Safe Torque Off) safety function. Designed for compact, high‑performance applications in packaging, pick‑and‑place, and general factory automation.

Applications:

• Pick‑and‑place robotics and automated assembly systems

• Packaging machinery and labeling equipment

• CNC machine tools and precision positioning tables

• Semiconductor and electronics manufacturing equipment

Technical Specifications:

Core Specifications

• Rated output power: 400 W (0.4 kW)

• Rated output current: 2.6 A (2.8 A with UL/CSA compliant motor)

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

• Permissible voltage fluctuation: 170‑264 V AC

• Permissible frequency fluctuation: ±5% max

• Rated output voltage: 3‑phase 170 V AC

• Control method: Sine‑wave PWM control / current control method

Control Modes

• Position control:

  • Max. input pulse frequency: 4 Mpps (differential receiver), 200 kpps (open‑collector)

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

  • Electronic gear: A/B multiplication (A: 1‑16,777,215, B: 1‑16,777,215, 1/10 < A/B < 4000)

  • In‑position range: 0 to ±65,535 pulses (command pulse unit)

  • Error excessive: ±3 revolutions

• Speed control:

  • Analog speed command input: 0 to ±10 V DC / rated speed

  • Speed control range: 1:2000 (analog), 1:5000 (internal)

  • Speed fluctuation: ±0.01% (load change 0‑100%), 0% (power fluctuation ±10%)

• Torque control:

  • Analog torque command input: 0 to ±8 V DC / maximum torque (input impedance 10‑12 kΩ)

  • Speed limit via parameter or external analog input (0 to +10 V DC / rated speed)

I/O & Interfaces

• Digital inputs: 9 total

  • 24 V DC sink/source: EM2, LSP, LSN, SON, RES, PC/ST1/RS2, TL/ST2/RS1, SP1, SP2

• Digital outputs: 5 relay contacts

  • ALM, ZSP, TLC/VLC, INP/SA, RD

• Analog inputs: 2

  • TLA/TC: 0‑10 V DC, VC/VLA: –10 to +10 V DC

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

Communication

• USB: MR Configurator2 compatible (PC connection for parameter setting, tuning, diagnostics)

• RS‑422: 1: n communication (up to 32 axes) for multi‑axis control

Physical & Environmental

• Cooling method: Natural cooling (fanless)

• Enclosure rating: IP20

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

• Weight: approx. 1.0 kg – 1.2 kg

• Operating ambient temperature: 0 °C … 55 °C

• Storage temperature: –20 °C … 65 °C

• Power consumption (drive auxiliary): 30 W

Built‑in Functions

• Dynamic brake: built‑in

• Regenerative resistor: built‑in (tolerable regenerative power 10 W)

• Safety function: STO (IEC/EN 61800‑5‑2) – SIL 3 / PL e (EN ISO 13849‑1)

• Advanced vibration suppression control II, adaptive filter II, robust filter, auto tuning, one‑touch tuning, tough drive function, drive recorder function, machine diagnosis function, power monitoring function, super trace control, lost motion compensation

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

Standards & Compliance
CE marking, TÜV Rheinland, cULus, UL, KC, EAC, UKCA, EN 61800‑5‑2, EN 61800‑5‑1, EN 61800‑3, EN ISO 13849‑1 (PL e / Cat 3), EN 62061 (SIL 3)

Motor Compatibility

• Compatible with Mitsubishi HG‑KR series (low inertia), HG‑MR series (medium inertia), and other MELSERVO‑J4 compatible servo motors

• Recommended matching motor: HG‑KR43J (400 W, 22‑bit absolute encoder)

System Integration

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

• The universal interface supports pulse train commands (differential line driver or open‑collector) and analog voltage commands.

• USB port (mini‑B) connects directly to a PC for parameter setting, tuning, and diagnostics using MR Configurator2 software.

• RS‑422 serial communication enables 1: n connection of up to 32 axes to a host controller, simplifying multi‑axis system integration.

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

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