Description
Precise motion control in automated manufacturing systems is driven by the MR-J4-20A, a high-performance 1-axis servo amplifier engineered by Mitsubishi Electric. Operating within the 200V class, this unit delivers a rated output of 0.2 kW, rendering it suitable for high-speed, high-accuracy industrial positioning. Built-in features include a sinusoidal wave PWM control system and an integrated dynamic brake, ensuring immediate, controlled deceleration and reliable performance under varying dynamic loads.
The MR-J4-20A utilizes a general-purpose command interface supporting pulse-train and analog inputs for position, speed, and torque control modes. Compatibility with 22-bit high-resolution encoders allows for fine positioning feedback. Integrated safety functions, certified to international functional safety standards, provide safe torque off (STO) capabilities, reducing external circuitry requirements in safety-critical automated layouts.
Features
- General-purpose interface for pulse train and analog command inputs.
- Built-in Safe Torque Off (STO) function complying with EN ISO 13849-1 Category 3 PL e and IEC 61508 SIL 3.
- Support for high-resolution 22-bit encoders (4,194,304 pulses/rev) to achieve smooth and stable low-speed performance.
- Integrated regenerative resistor with a 10 W capacity, expandable via external units.
- Advanced control functions including auto-tuning, adaptive vibration suppression filters, and machine analyzers.
- Dual communication interfaces featuring standard USB for configuration via MR Configurator2 and RS-422/RS-485 for multi-axis networking up to 32 axes.
Applications
- Packaging machines and labeling systems requiring synchronized axis control.
- Material handling systems, conveyors, and pick-and-place gantry units.
- Semiconductor fabrication systems and electronic component assembly.
- Machine tool feed axes and auxiliary mechanical actuators.
Technical Specifications
Manufacturer
| Mitsubishi Electric |
Part Number / Model
| MR-J4-20A |
Series
| MELSERVO-J4 Series |
Command Interface
| General-purpose interface (Pulse/Analog) |
Motor Rated Output
| 0.2 kW |
Voltage Class
| 200V |
Output Rated Voltage
| 3-phase AC 170 V |
Output Rated Current
| 1.5 A |
Main Circuit Power Input
| 3-phase or 1-phase AC 200 V to 240 V, 50 Hz / 60 Hz |
Main Circuit Rated Current
| 1.5 A |
Control Circuit Power Input
| 1-phase AC 200 V to 240 V, 50 Hz / 60 Hz |
Control Circuit Rated Current
| 0.2 A |
Control Circuit Power Consumption
| 30 W |
Control Method
| Sinusoidal wave PWM control / Current control system |
Dynamic Brake
| Built-in |
Permissible Regenerative Power
| 10 W (Built-in regenerative resistor) |
Interface Power Requirement
| DC 24 V (±10%, required current capacity: 0.5 A including CN8 connector signal) |
Feedback Resolution
| 22-bit (4,194,304 pulses/rev) |
IP Protection Rating
| IP20 (Open / Self-cooling) |
Operating Ambient Temperature
| 0 degC to 55 degC (non-freezing) |
Storage Ambient Temperature
| -20 degC to 65 degC (non-freezing) |
Ambient Humidity
| 90% RH or less (non-condensing) |
Vibration Resistance
| 5.9 m/s² (10 Hz to 55 Hz in X, Y, Z directions) |
Installation Altitude
| Up to 2000 meters above sea level |
Weight
| 0.8 kg |
Connections and Interfaces
| Connector / Port Type |
Function Description |
CN1
| I/O signals (Pulse train input, analog commands, limit switches, and control inputs) |
CN2
| Encoder interface connection (High-speed serial feedback communication) |
CN3
| RS-422/RS-485 serial communication port (1:N up to 32 axes) |
CN5
| USB port (Connection to PC for MR Configurator2 diagnostics and parameter setup) |
CN8
| STO (Safe Torque Off) safety function input signals |
L1 / L2 / L3
| Main circuit AC power supply terminals |
L11 / L21
| Control circuit AC power supply terminals |
U / V / W
| Servo motor power output terminals |
Installation Guidelines
- Mount the servo amplifier vertically on a flat, non-flammable surface to facilitate efficient natural heat dissipation.
- Ensure clearance of at least 10 mm on the left and right sides, and at least 40 mm above and below the amplifier for ventilation.
- Use shielded cables for encoder and control signal wiring to prevent electromagnetic interference (EMI).
- Connect the protective earth (PE) terminal securely to the control cabinet's main grounding point.
- Provide external circuit breakers or fuses matching the technical input ratings specified on the device.
Compliance and Certifications
- CE (LVD, EMC Directives)
- UL Listed / cUL
- Functional Safety: EN ISO 13849-1 Category 3 PL e, IEC 61508 SIL 3, EN 62061 SIL CL 3, EN 61800-5-2