Mitsubishi MELSEC MR-J3-40A Servo Amplifier | 400W 3-Phase or 1-Phase 200V

Product Overview

The MR-J3-40A (MRJ340A) is a high-performance AC servo amplifier from Mitsubishi Electric’s flagship MR-J3 series. Rated for a 400W output, this "General-Purpose Interface" model (Type A) is designed for high-speed, high-precision motion control using pulse train or analog voltage input.

The MR-J3-40A is recognized for its industry-leading 2100Hz speed frequency response, which enables ultra-short positioning times and exceptional synchronization in demanding applications like semiconductor manufacturing, high-speed labeling, and CNC precision machining. Equipped with advanced auto-tuning and vibration suppression, the MR-J3-40A ensures that even machines with high inertia or mechanical resonance operate with smooth, stable motion.

Technical Performance

The MR-J3 series introduced several breakthrough technologies for the industrial automation market:

• 18-Bit High-Resolution Encoder: Supports encoders with 262,144 pulses per revolution, providing extreme speed constancy and positioning accuracy.

• Advanced Vibration Suppression Control: Automatically neutralizes vibrations at the end of a move and reduces resonance frequencies caused by machine arm flexibility.

• Real-Time Auto-Tuning: The "Model Adaptive Control" continuously calculates the load inertia ratio and adjusts gain parameters in real-time, drastically reducing setup time.

• Integrated Absolute Encoder Support: When paired with a compatible Mitsubishi motor and battery, the system functions as an absolute positioning system without requiring a home return sequence upon power-up.

• Plug & Play Identification: Automatically identifies the connected servo motor parameters upon startup, minimizing configuration errors.

Technical Specifications

Technical FAQs

Can the MR-J3-40A be used with a 1-phase power supply?

Yes. For the 400W model, you can use either a 3-phase 200V AC or a 1-phase 200–230V AC supply. Note that when using 1-phase power, you must connect to terminals L1 and L2 and ensure the power capacity is sufficient for the motor's peak torque requirements.

What is the difference between MR-J3-40A and MR-J3-40B?

The Type A (this model) uses a general-purpose interface (Pulse/Analog). The Type B uses the SSCNET III high-speed optical fiber network for communication with Mitsubishi Motion Controllers (Q-Series or iQ-R Series).

How do I clear an "AL 16" (Encoder Error) on this drive?

An AL 16 code usually indicates a communication failure between the drive and the motor encoder. Check the encoder cable for damage, ensure the connector is fully seated, and verify that the cable is shielded and routed away from high-voltage motor power lines to prevent EMI interference.

Engineering & Installation Guide

Wiring and EMI Mitigation

To maintain the 2100Hz response accuracy, use original Mitsubishi pre-fabricated cables for the encoder and power connections. Always install a noise filter on the input power line and ensure the amplifier is properly grounded to the cabinet's backplane. Keep the signal wires (CN1 connector) separate from the U/V/W motor output wires to prevent signal noise that can lead to position deviation.

Parameter Configuration

While auto-tuning is highly effective, specific applications may require manual parameter adjustment via MR Configurator software. If the machine exhibits a high-pitched "humming" noise, utilize the integrated Machine Resonance Suppression Filter (Notch Filter) parameters to isolate and dampen the specific resonance frequency of the mechanical system.

Thermal Management

The MR-J3-40A is a compact drive (40mm width). When mounting multiple drives in a row ("side-by-side" mounting), maintain at least 10mm of clearance between amplifiers and 50mm above and below the units. In high-duty cycle applications, ensure the cabinet has forced-air cooling to keep the ambient temperature below 55°C.