Mitsubishi Electric MR-J4-200A MELSERVO-J4 Series 1-Axis Servo Amplifier

Description

Integrating seamlessly into high-precision motion topologies, the Mitsubishi Electric MR-J4-200A delivers highly responsive closed-loop control as a general-purpose, single-axis servo drive. This unit is specifically engineered to operate within the 200V class, offering a robust 2.0 kW rated output compatible with low and medium-inertia rotary servo motors. Built with advanced digital signal processors, the servo amplifier utilizes general-purpose interfaces, accepting pulse train commands up to 4 Mpulses/s and analog voltage inputs for speed or torque regulation. By eliminating complex network configurations, this model provides direct integration with legacy PLCs and standard positioning modules while maintaining the dynamic performance of the MELSERVO-J4 platform.

Features

• General-Purpose Interface: Flexible command options supporting pulse-train input (differential line driver or open collector) and +/-10V analog voltage control.
• Real-Time Auto Tuning: One-touch tuning algorithm automatically measures mechanical resonance frequencies and configures optimal servo gains.
• Advanced Vibration Suppression: Incorporates Mitsubishi Electric Vibration Suppression Control II to minimize transient oscillations on the machine end.
• High-Resolution Feedback compatibility: Capable of processing absolute encoder inputs to secure micron-level positioning repeatability.
• Integrated Safety Function: Features native Safe Torque Off (STO) input channels to simplify machine safety system compliance.

Applications

• High-speed pick-and-place packaging systems.
• Multi-axis gantry positioning and Cartesian coordinate robots.
• Semiconductor fabrication handling systems and wafer positioning.
• Automated rotary indexing tables and metalforming machinery.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The MR-J4-200A features the "A" general-purpose analog/pulse interface and is physically and electronically incompatible with the "B" suffix units (such as MR-J4-200B), which use SSCNET III/H fiber-optic network communication. When replacing a legacy MR-J3-200A unit, parameter conversion must be performed using MR Configurator2, and motor matching should be verified since MR-J4 series drives are paired with HG series servo motors.

Application Pitfalls & Engineering Notes

During dynamic decelerations or high-inertia vertical axis operations, the internal regenerative capacity of this 2.0 kW drive can become saturated, triggering an AL.30 (Regenerative error). If this occurs, do not increase the fault threshold; instead, remove the shorting bar between the P+ and D terminals and wire an external regenerative resistor. Always ensure the cabinet has at least 10 mm of clear spacing on either side of the unit to allow the integrated fan to dissipate thermal exhaust efficiently.

Commissioning & Wiring Tips

To avoid encoder transmission faults (AL.16), the CN2 encoder shield must be clamped directly to the amplifier’s grounded installation plate using a metallic grounding clip. If long pulse-train lines are required, avoid open-collector wiring and always implement differential line-driver control signals at CN1 to optimize noise immunity and maintain positioning consistency at high frequency commands.

Installation Guidelines