Mitsubishi MR-J3-DU55KBS4 Servo Amplifier: Maximum Power for Heavy-Duty Motion

This is the Mitsubishi MR-J3-DU55KBS4, the powerhouse of the MELSERVO MR-J3 series. Designed for the most demanding applications, this 55kW servo amplifier delivers immense torque and precision control for large industrial machinery. The MR-J3-DU55KBS4 is built for integration, reliability, and safety in high-power motion systems.

Unmatched Power and Integration

• Extreme Power Output: Delivers a massive 55 kW rated output with 143A current for driving very large servo motors.
• High-Voltage Operation: Designed for 400V-class industrial power (380-480VAC, 3-phase).
• High-Speed Network: Features SSCNET III/H fiber optic communication for synchronized, multi-axis control.
• Advanced Safety: Includes comprehensive integrated drive safety functions and protection circuits.
• Multi-Drive Ready: Designed to be compatible and synchronized with other drive units in a system.

Complete Technical Specifications

• Brand & Series: Mitsubishi Electric, MELSERVO MR-J3 Series.
• Model: MR-J3-DU55KBS4 Servo Amplifier/Drive Unit.
• Rated Output: 55.0 kW.
• Rated Current: 143 A.
• Supply Voltage: 3-phase, 380-480VAC, 50/60Hz (400V class).
• Communication Interface: SSCNET III/H (High-speed fiber optic network).
• Control Method: Advanced sine-wave PWM control with high-performance current regulation.
• Protection Functions: Overcurrent, regeneration overvoltage, overload, undervoltage, overspeed, excessive error protection.
• Safety Features: Integrated safety functions (STO - Safe Torque Off likely supported).
• Cooling Method: Integrated forced cooling system (specific type: liquid or forced air to be confirmed).
• Digital Inputs/Outputs: Multiple digital I/O for control and status monitoring.
• Ambient Temperature: 0°C to +55°C for operation.
• Compatibility: Designed for multi-axis configurations with other MR-J3 drive units.
• Typical Applications: Large press lines, heavy-duty test rigs, large CNC gantry mills, extruders, mining machinery.

Warranty and Support Commitment

We provide confidence for your critical investments. This high-power amplifier is covered by a standard 12-month warranty.

Global Logistics

We coordinate specialized shipping for large industrial components. Deliveries are arranged via FedEx, UPS, or DHL freight services, with full tracking and logistics support.

Frequently Asked Questions (FAQ)

What kind of machinery requires a 55kW servo amplifier?

This amplifier is for the most demanding applications. It is used in large industrial machines such as metal stamping presses, plastic injection molding machines (large clamp), heavy-duty rolling mills, large-scale material handling cranes, and test stands for automotive or aerospace components.

What is the difference between SSCNET III and SSCNET III/H?

SSCNET III/H is an enhanced version offering higher transmission speeds and improved synchronization performance. It is designed for high-performance systems where minimizing control latency across many large axes is absolutely critical.

What does "Integrated Drive Safety" typically include?

This often refers to built-in safety functions compliant with standards like IEC 61800-5-2. A key feature is typically Safe Torque Off (STO), which safely disables the motor drive torque without relying on an external contactor, enhancing safety and reliability.

What special installation considerations are needed for this high-power unit?

Installation is critical. It requires: a dedicated high-current power supply, proper thick gauge wiring, a robust and ventilated cabinet, potential external cooling (if liquid-cooled), correct grounding, and often coordination with facilities management for electrical supply.

Can this drive be used in a single-axis system, or is it only for multi-axis?

It can be used for a single, very large motor. However, its advanced communication (SSCNET III/H) and multi-drive compatibility features make it particularly cost-effective and powerful when used as part of a synchronized multi-axis system controlling a complex machine.

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