Mitsubishi MR-J4-500B MELSERVO MR-J4 Series Servo Amplifier

Product Overview

The Mitsubishi MR-J4-500B is a high-performance servo amplifier. It belongs to the MELSERVO MR-J4 product line. This unit controls one axis with precision and efficiency. You get 5 kW rated capacity for demanding applications. The MR-J4-500B suits industrial automation systems perfectly.

This servo amplifier uses sine-wave PWM control. The current control method ensures smooth motor operation. You can rely on the Mitsubishi MR-J4-500B for robotics, CNC machines, and packaging equipment. Its robust design handles harsh factory conditions well.

Technical Specifications

The MR-J4-500B delivers 28A output current. It consumes only 45W maximum power. The unit weighs 6.80 kg for manageable installation. Below are the complete technical parameters.

• Manufacturer: Mitsubishi Electric

• Product Type: Servo Amplifier

• Product Line: MELSERVO MR-J4 Series

• Part Number: MR-J4-500B

• Weight: 6.80 kg (15.00 lbs)

• Rated Capacity: 5 kW

• Output Current: 28A

• Power Consumption (max): 45W

• Safety Function Type: STO (IEC/EN 61800-5-2)

• Dynamic Brake: Built-in

• Structure: Force cooling, open (IP20)

• Control Method: Sine-wave PWM control, current control method

• Interface: SSCNET III/H

• Main Circuit Power Supply: 3-phase 200-240 VAC, 50/60 Hz

• Control Circuit Power Supply: 1-phase 200-240 VAC, 50/60 Hz

STO Safety Function

The Mitsubishi MR-J4-500B includes STO safety function type. STO stands for Safe Torque Off. This function shuts off motor power safely without removing supply voltage. You can use this in safety-critical scenarios. The STO meets IEC/EN 61800-5-2 standards. This feature protects operators during machine maintenance.

Built-in Dynamic Brake

The MR-J4-500B has a built-in dynamic brake. This brake decelerates the motor very quickly. It reduces rotational energy for controlled stops. The dynamic brake activates during an emergency stop. It also engages when the servo drive detects a fault. This feature prevents mechanical damage from uncontrolled motor motion.

Power Supply Configuration

This servo amplifier uses a 3-phase power supply. The main circuit accepts 200-240 VAC at 50/60 Hz. The control circuit runs on 1-phase 200-240 VAC separately. This design delivers steady motor control power. The Mitsubishi MR-J4-500B maintains stable torque even under load changes. Proper power wiring is essential for full performance.

SSCNET III/H Interface

The MR-J4-500B uses SSCNET III/H interface for communication. SSCNET stands for Servo System Controller Network. This high-speed serial interface connects to Mitsubishi motion controllers. You get real-time command and feedback data. The Mitsubishi MR-J4-500B supports long cable distances. This interface reduces wiring compared to pulse-based systems.

Environmental Rating and Cooling

This servo amplifier has an IP20 open rating. It uses force cooling to manage heat. The MR-J4-500B requires installation in a clean cabinet. Do not expose it to dust or liquids. The force cooling fan runs whenever the drive operates. Keep proper clearance around the unit for airflow. Regular fan cleaning extends product life.

Installation Guidance

Follow these steps to install the Mitsubishi MR-J4-500B correctly.

1. Mount the Unit: Secure the MR-J4-500B vertically inside a control cabinet.

2. Apply Main Power: Connect 3-phase 200-240VAC to the main circuit terminals.

3. Apply Control Power: Connect 1-phase 200-240VAC to the control circuit terminals.

4. Wire the Motor: Connect the servo motor cables to the output terminals.

5. Connect SSCNET III/H: Plug the fiber optic cables into the interface ports.

6. Wire STO Circuit: Connect the safe torque off safety inputs.

7. Ground Properly: Use the ground terminal for electrical safety.

8. Set Parameters: Configure the Mitsubishi MR-J4-500B using MR Configurator software.

Do not touch the heat sink during operation. Use shielded cables for all signal wiring. Keep power and signal cables separated.

Control Method Details

The MR-J4-500B uses sine-wave PWM control. This method creates smooth motor rotation. It reduces torque ripple and acoustic noise. The current control method responds quickly to load changes. You get precise speed and position control. The Mitsubishi MR-J4-500B works best with Mitsubishi HG series servo motors.

Package Contents

• One Mitsubishi MR-J4-500B servo amplifier unit

• One built-in dynamic brake (factory installed)

• One control circuit terminal block (included)

• One main circuit terminal block (included)

• One product instruction manual (digital format)

• One anti-static protective bag

Frequently Asked Questions (FAQ)

Q1: Can the MR-J4-500B control a motor without an external brake resistor?
A1: Yes, the MR-J4-500B has a built-in dynamic brake. For frequent deceleration, add an external regenerative resistor. Check your duty cycle before operation.

Q2: What motors are compatible with the MR-J4-500B?
A2: The Mitsubishi MR-J4-500B works with HG series servo motors. Use motors rated for 5kW and 28A current. Consult the MR-J4 compatibility document for exact models.

Q3: Does the STO function replace the main contactor?
A3: No, STO on the MR-J4-500B is not a disconnect device. You still need a main contactor for electrical isolation. STO removes torque only, not voltage.

Q4: What is the maximum cable length for SSCNET III/H?
A4: The MR-J4-500B supports SSCNET III/H cables up to 100 meters. Use Mitsubishi specified fiber optic cables only. Longer cables may cause communication errors.

Q5: Can I use the MR-J4-500B on single-phase power?
A5: No, the Mitsubishi MR-J4-500B requires 3-phase power for main circuit. Single-phase operation causes low torque and drive fault codes. Check your facility power before purchase.