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Comprehensive Guide to Installing MELSERVO MR-J2S-B Servo Amplifiers

Comprehensive Guide to Installing MELSERVO MR-J2S-B Servo Amplifiers

Introduction to the MELSERVO MR-J2S-B Series

The MELSERVO MR-J2S-B series is part of the J2-Super lineup, known for its high performance and advanced features. These servo amplifiers are designed for general-purpose AC servo systems and are SSCNET compatible, making them ideal for various industrial applications. Key features include high-resolution encoders, adaptive vibration suppression, and real-time auto-tuning capabilities.

Installing the MELSERVO MR-J2S-B Servo Amplifier is a critical task that requires precision and attention to detail. This guide will walk you through each step to ensure a successful installation, from initial setup to final checks. Whether you're a seasoned engineer or a newcomer to industrial automation, this comprehensive guide will provide you with the knowledge and confidence needed to install the MR-J2S-B correctly and safely. 

Pre-Installation Preparation

1. Read the Manuals:

  • Before beginning, thoroughly read the MR-J2S-B Instruction Manual, Installation Guide, and the Servo Motor Instruction Manual. Familiarize yourself with all safety instructions, specifications, and procedures.

2. Gather Necessary Tools and Equipment:

  • Ensure you have all the required tools, such as screwdrivers, voltage testers, wire cutters, and torque wrenches. Additionally, gather any personal protective equipment (PPE) like gloves and safety glasses.

3. Verify Environmental Conditions:

  • Check that the installation environment meets the specified conditions:
    • Ambient Temperature: 0 to 55°C (32 to 131°F) during operation.
    • Humidity: 90% RH or less, non-condensing.
    • Location: Indoors, free from corrosive gases, flammable gases, oil mist, dust, and dirt.
    • Altitude: Up to 1000 meters (3280 feet) above sea level.

Safety Precautions

1. Electrical Safety:

  • Before wiring or inspection, turn off the power and wait at least 15 minutes for the charge lamp to turn off. Use a voltage tester to confirm that the voltage between P and N is safe.
  • Always ground the servo amplifier and servo motor.
  • Ensure only qualified personnel handle wiring and inspections.

2. Mechanical Safety:

  • Install the servo amplifier and servo motor on incombustible material.
  • Avoid placing heavy objects on the equipment or using it to support other loads.
  • Ensure proper clearance around the amplifier to facilitate cooling and prevent overheating.

Step-by-Step Installation

1. Mounting the Servo Amplifier:

  • Securely mount the servo amplifier on a load-bearing surface following the specified orientation. Ensure the mounting surface can support the amplifier's weight and is free from vibrations.
  • Leave adequate clearance around the amplifier for ventilation. Refer to the manual for specific clearance recommendations.

2. Wiring the Power Supply:

  • Three-Phase Power (200-230V):
    • Connect the three-phase power supply lines to terminals L1, L2, and L3. Ensure the connections are tight and secure.
  • Single-Phase Power (100-120V):
    • Connect the single-phase power supply to terminals L1 and L2, leaving L3 open.
  • Use a no-fuse breaker (NFB) or fuse and a magnetic contactor (MC) between the power supply and the servo amplifier to ensure safety and protection.

3. Grounding:

  • Connect the protective earth (PE) terminal of the servo amplifier to the control box’s PE terminal. Use dedicated ground cables to avoid electrical noise and ensure proper grounding.

4. Connecting the Servo Motor:

  • Connect the servo motor power cables to terminals U, V, and W on the servo amplifier. Ensure the connections are correct to avoid improper motor operation.
  • Attach the encoder cable from the servo motor to connector CN2 on the amplifier.

5. Control Circuit Connections:

  • Connect the control circuit power supply to the control circuit terminal block (TE2) on the servo amplifier.
  • Use shielded cables for control signals to minimize electrical interference.

6. Auxiliary Equipment:

  • If using regenerative options or additional brake units, connect these to the appropriate terminals as specified in the manual.
  • Install noise filters or reactors if recommended for your specific installation to comply with EMC requirements.

Initial Power-On and Configuration

1. First Power-On:

  • After all connections are securely made, switch on the power supply. Observe the charge lamp to ensure the servo amplifier powers up correctly.
  • The display on the amplifier should show the initial status. Check for any error codes and refer to the manual if any are displayed.

2. Parameter Settings:

  • Use the MR Configurator (servo configuration software) to connect to the servo amplifier via the RS-232C port. This software allows for easy parameter setting and monitoring.
  • Set the necessary parameters according to your application requirements. This includes motor type, control mode, and specific settings for your system.

3. Test Operation:

  • Perform a test run to verify the installation. Use the software to initiate basic movements and check the operation of the servo motor.
  • Monitor the system for any unusual noises, vibrations, or errors.

Final Checks and Maintenance

1. Regular Maintenance:

  • Schedule regular inspections to ensure all connections remain secure and components are in good condition.
  • Replace the electrolytic capacitors in the servo amplifier every 10 years to prevent potential failures.

2. Documentation:

  • Keep detailed records of the installation process, parameter settings, and maintenance activities. This documentation will be invaluable for troubleshooting and future maintenance.

Buy a MELSERVO MR-J2S-B series servo amplifier today!

Frequently Asked Questions (FAQs)

Q: What should I do if the servo amplifier shows an error code during the first power-on?

  • A: Refer to the manual's troubleshooting section for specific error codes and their remedies. Ensure all connections are secure and parameters are correctly set.

Q: How can I minimize electrical interference during installation?

  • A: Use shielded cables for control signals and install noise filters as the manual recommends. Proper grounding is also crucial to minimize interference.

Q: Is it necessary to use a no-fuse breaker (NFB) for the power supply?

  • A: Yes, using a no-fuse breaker (NFB) or fuse ensures protection against overcurrent and short circuits, enhancing the system's safety and reliability.


Installing the MELSERVO MR-J2S-B Servo Amplifier is a detailed process that, when done correctly, ensures optimal performance and longevity of your servo system. By following this comprehensive guide, you can confidently set up your servo amplifier, ensuring safety and efficiency in your operations. Remember, a well-installed and maintained servo system is key to reliable and precise industrial automation.

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