Mitsubishi Electric MR-J4-40B MELSEC MR-J4 Series Servo Amplifier

Description

Designed to meet the stringent demands of high-speed, multi-axis motion control applications, the Mitsubishi Electric MR-J4-40B is a highly responsive 200V servo amplifier operating on the proprietary SSCNET III/H fiber optic communication network. This unit provides a rated output of 0.4 kW (400W) and leverages advanced real-time tuning algorithms to minimize mechanical vibration and maximize positioning accuracy. Built with native Safe Torque Off (STO) functionality, the hardware ensures high-integrity functional safety within modern industrial architectures while maintaining a compact IP20 physical footprint.

Key Features

• SSCNET III/H Interface: High-speed synchronous optical network capability enabling communication cycle times down to 0.222 ms for highly synchronized multi-axis operations.
• Advanced Vibration Suppression: Employs Advanced Vibration Suppression Control II and dual adaptive filters to automatically detect and suppress mechanical resonance.
• Integrated Functional Safety: Certified STO (Safe Torque Off) dual-channel input to bypass the power stage without de-energizing the main circuit.
• Robust Control Architecture: Employs sinusoidal wave PWM control paired with continuous current feedback loop adjustment for seamless motor torque execution.

Applications

• High-speed semiconductor packaging and wire-bonding machinery.
• Multi-axis Cartesian robotic pick-and-place stations.
• Precision rotary packaging, indexing, and labeling systems.
• Automated tool changers and synchronized positioning gantries.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The unit includes a built-in J3 compatibility mode, enabling seamless retrofitting of older MR-J3-40B architectures without replacing existing servo motor physical runs. However, note that parameters must be migrated via MR Configurator2, and maximum bus speed will match the lower J3 performance characteristics unless the upstream controller is fully reconfigured to the SSCNET III/H native protocol.

Application Pitfalls & Engineering Notes

When operating on a single-phase AC 200V line instead of a three-phase line, the power supply must be wired to L1 and L3 terminals (leaving L2 empty). Under single-phase configurations, the thermal dissipation characteristics within the electrical enclosure change significantly. Panel builders must ensure an active airflow buffer of at least 10 mm on both sides of the amplifier when mounting multiple units in a daisy-chain configuration.

Commissioning & Wiring Tips

The fiber-optic SSCNET III/H cables (MR-J3BUS) must never be bent past their minimum specified bend radius of 25 mm. Exceeding this limit will result in intermittent optical communication errors (such as AL.37 or AL.E6). Always use the dedicated CN8 shorting connector if the STO function is not integrated into an active safety PLC loop, or the amplifier will remain in a permanent STO block state.

Installation Guidelines