Mitsubishi Electric MR-J4-350B MELSERVO-J4 1-Axis Servo Amplifier

Description

Operating within the MELSERVO-J4 system architecture, the MR-J4-350B is a high-performance 1-axis servo amplifier engineered for precise motion control applications. This unit supports a 3.5 kW capacity and operates on a 200 VAC class supply, utilizing SSCNET III/H high-speed synchronous network communication to achieve high-resolution, low-latency control in automated machinery. By isolating the main circuit power supply from the control circuit power supply, the unit maintains communications and diagnostic capabilities even when the main 3-phase power is disconnected.

The system utilizes a sinusoidal wave PWM control scheme combined with a real-time current control system. This ensures smooth torque delivery, minimal velocity ripple, and highly responsive path tracking. Built to integrate seamlessly with Q-Series, L-Series, and iQ-F/iQ-R Series motion controllers, this servo amplifier is widely deployed in industrial environments requiring rigorous synchronization and dynamic response.

Features

• SSCNET III/H fiber-optic network interface for high-speed, noise-immune synchronous communication.
• Separate main and control circuit power inputs to preserve fault logging and system state monitoring during emergency power-off conditions.
• Sinusoidal wave PWM control and current control system for optimized torque output and acoustic noise reduction.
• Integrated 24 VDC interface power supply management for stable processing of control signals.
• Built-in diagnostic tools and real-time auto-tuning functions for automated machine inertia detection.

Applications

• Precision packaging and filling machinery
• Multi-axis CNC milling and metal cutting centers
• Semiconductor fabrication and wafer handling systems
• High-speed automated pick-and-place assembly lines
• Automated warehousing and material handling gantry systems

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Mounting Orientation: Mount the amplifier vertically on a flat, rigid vertical surface. Maintain a minimum top/bottom clearance of 40 mm and a side clearance of 10 mm to ensure unrestricted airflow.
• Environmental Protection: Install the device inside a dust-free, enclosed control cabinet. Ensure the cabinet environment remains within nominal operating temperatures and below 90% non-condensing relative humidity.
• Grounding: Connect the dedicated protective earth (PE) terminal of the amplifier to the control cabinet's central grounding bar using a thick, low-impedance ground wire.
• Shielding & Routing: Always separate high-voltage motor power cables (U/V/W) from the fiber-optic SSCNET III/H cables and encoder lines to prevent electromagnetic interference from degrading signal integrity.