Mitsubishi Electric MR-J4-200B-RJ MELSERVO-J4 Series Servo Amplifier

Description

Providing high-speed, high-precision motion control within the MELSERVO-J4 architecture, the Mitsubishi Electric MR-J4-200B-RJ is a 2 kW rated output AC servo amplifier. This unit utilizes the fiber-optic SSCNET III/H network interface to deliver synchronous real-time control with minimal noise susceptibility. The -RJ suffix indicates its unique capability to support conversion units, enabling flexible integration with external encoder interfaces, CC-Link IE Field communication networks, or specialized absolute position detection systems. Operating on a three-phase input of 200 V AC to 240 V AC, this amplifier coordinates with HG-series rotary or linear servo motors to maintain exceptional loop response times in demanding industrial motion applications.

Key Features

• High-Speed SSCNET III/H: Uses optical fiber communication to ensure noise-free, high-speed command transmission and precise multi-axis synchronization.
• Specialized -RJ Compatibility: Supports interface conversion units to connect with alternative absolute feedback encoders and auxiliary networks.
• Advanced Vibration Suppression: Built-in machine resonance filter and low-frequency vibration suppression algorithm to protect mechanical structures.
• Robust Protective Functions: Integrated overcurrent shutoff, regenerative overvoltage shutoff, and motor overload (thermal overload) detection.

Applications

• Multi-axis CNC machining centers and high-speed milling systems.
• Precision semiconductor assembly, pick-and-place, and wafer handling systems.
• Automated packaging machinery, rotary indexing tables, and high-speed labeling systems.
• Cartesian and multi-joint industrial robotics requiring coordinated trajectory control.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The standard MR-J4-200B version is directly compatible with basic SSCNET III/H setups, but it lacks the interface translation layer of the -RJ variant. If you are substituting an older MR-J3-200B drive, you must run the system controller in J3 compatibility mode or migrate your network master parameters to SSCNET III/H. Note that the -RJ model allows the attachment of the MR-J4-T20 card for seamless transition to CC-Link IE Field networks without replacing the entire amplifier chassis.

Application Pitfalls & Engineering Notes

Ensure optimal space layout: because the unit dissipates up to 120 W under continuous maximum loads, adjacent amplifiers must maintain a minimum 10 mm clear lateral spacing unless derated. In highly reflective optical environments, or where optical fiber cables are tightly bent, AL.37 (Parameter Error) or AL.16 (Encoder Initial Communication Error) can trigger due to packet loss. Maintain a fiber-optic bend radius of at least 25 mm to prevent light transmission degradation.

Commissioning & Wiring Tips

Always connect the ground terminal (PE) of the servo motor directly to the ground terminal of the amplifier to suppress high-frequency EMI. Grounding the motor only to the machine frame can cause intermittent absolute encoder errors due to structural potential differences. When utilizing absolute position detection, ensure a compliant lithium-metal battery pack (such as the MR-BAT6V1SET) is installed and operational before attempting to clear home parameters.

Installation Guidelines