Mitsubishi Servo Amplifier MR-J5 Commissioning: Gain Tuning, Vibration Suppression, Safety Function STO, SSCNET III Communication

Introduction

In the realm of industrial automation, achieving optimal positioning accuracy, rapid settling time, and maximum machine throughput are critical for maintaining competitive production efficiency. Servo systems play a pivotal role in these aspects, and their commissioning is a crucial step that can make or break the performance of automated machinery such as CNC machines, pick-and-place robots, and precision positioning systems.

The Mitsubishi MR-J5 series servo amplifiers are designed to meet the demanding requirements of modern automation applications. With a comprehensive suite of features including advanced gain tuning, sophisticated vibration suppression, integrated safety functions, and high-speed communication capabilities, the MR-J5 series offers a robust solution for motion control engineers and system integrators.

This article provides a detailed guide on commissioning the Mitsubishi MR-J5 series servo amplifiers, focusing on key aspects such as gain tuning, vibration suppression, the STO (Safe Torque Off) safety function, and SSCNET III communication setup. By following the guidelines outlined here, engineers can ensure that their servo systems operate at peak performance, thereby maximizing machine productivity and reliability.

For more information on the Mitsubishi MR-J5 series, please visit the Mitsubishi MR-HDP01 Servo Amplifier product page.

MR-J5 Series Product Overview

The Mitsubishi MR-J5 series servo amplifiers are designed to deliver high performance and reliability across a wide range of applications. The series boasts a power rating range from 0.1kW to 110kW, making it suitable for both small and large-scale automation systems. The amplifiers are equipped with the SSCNET III/H interface, which enables high-speed, real-time communication between the servo amplifier and the controller.

One of the standout features of the MR-J5 series is its built-in safety functions, including the STO (Safe Torque Off) capability, which ensures safe operation in compliance with international safety standards. The drive unit of the MR-J5 series carries an IP67 rating, indicating its robustness against dust and water ingress, which is crucial for maintaining operational integrity in harsh industrial environments.

The MR-J5 series is compatible with a variety of servo motor series, including the HG-KR, HG-SR, and HG-JR, providing flexibility in system design and integration. For more details on motor protection, consider the Mitsubishi DU-N60 Motor Protection Relay.

One-Touch Gain Tuning and Manual Gain Adjustment

Real-Time Auto-Tuning Function

The MR-J5 series is equipped with a real-time auto-tuning function that simplifies the process of achieving optimal performance. This feature automatically adjusts the servo gains based on the actual load conditions and machine dynamics, ensuring rapid and precise response.

Machine Rigidity Parameter

The machine rigidity parameter is a critical factor in determining the servo system’s response. The MR-J5 series allows for the adjustment of this parameter, enabling engineers to fine-tune the system to match the specific rigidity characteristics of the machine.

Model Following Control

Model following control is another advanced feature of the MR-J5 series. This function allows the servo system to mimic the behavior of a reference model, providing more predictable and controlled motion. This is particularly useful in applications where precise trajectory tracking is required.

Feedforward Gain and Ratio Setting

The MR-J5 series also supports the adjustment of feedforward gain and the ratio setting between position gain and speed gain. These parameters can be fine-tuned to optimize the system’s responsiveness and stability, ensuring smooth and accurate motion control.

Vibration Suppression and Resonance Countermeasure

Adaptive Notch Filter

Vibration can be a significant issue in servo systems, leading to reduced performance and increased wear. The MR-J5 series addresses this with an adaptive notch filter that automatically detects and suppresses resonant frequencies, thereby minimizing vibration.

Low-Pass Filter Configuration

In addition to the adaptive notch filter, the MR-J5 series allows for the configuration of low-pass filters. These filters can be used to attenuate high-frequency noise, further enhancing the system’s stability and performance.

Anti-Resonance Control Function

The anti-resonance control function is another key feature that helps in suppressing mechanical vibrations. This function actively counteracts resonant frequencies, ensuring smooth operation even under varying load conditions.

Suppression of Mechanical Vibration at 100-450 Hz Range

The MR-J5 series is particularly effective at suppressing mechanical vibrations in the 100-450 Hz range. This is achieved through a combination of advanced filtering techniques and real-time monitoring, providing robust vibration control.

Load Inertia Ratio Estimation

Accurate estimation of the load inertia ratio is crucial for effective vibration suppression. The MR-J5 series includes a load inertia ratio estimation feature that simplifies this process, allowing for more precise tuning and improved system performance.

STO Safety Function and SIL3 Compliance

Safe Torque Off (STO) Wiring

The STO function is a critical safety feature that disables the torque output of the servo motor, ensuring safe operation in emergency scenarios. The MR-J5 series supports STO wiring with dual-channel redundant input, providing an additional layer of safety.

Reaction Time

The reaction time of the STO function is an important consideration for safety-critical applications. The MR-J5 series offers a fast reaction time, ensuring rapid shutdown in response to safety triggers.

IEC 61800-5-2 Compliance

The MR-J5 series complies with the IEC 61800-5-2 standard, which sets the requirements for the STO function in variable speed electrical drives. This compliance ensures that the safety functions meet international standards.

SIL3/PLe Certification

The MR-J5 series is certified to SIL3/PLe levels, indicating its high safety integrity. This certification is a testament to the robust design and reliability of the safety functions.

Test Pulse Configuration

The MR-J5 series allows for the configuration of test pulses, enabling engineers to verify the functionality of the STO function. This is an important step in ensuring the reliability of the safety system.

For more information on safety relays, please visit the Mitsubishi DU-N60 Motor Protection Relay product page.

SSCNET III Communication Setup

Optical Fiber Cable Routing

The SSCNET III interface uses optical fiber cables for high-speed communication. Proper routing of these cables is essential to ensure reliable data transmission. The MR-J5 series provides guidelines for cable routing to minimize interference and signal loss.

Bend Radius

The bend radius of the optical fiber cables is an important consideration to prevent signal degradation. The MR-J5 series specifies the minimum bend radius for the cables, ensuring that the installation adheres to best practices.

Station Address Assignment

Each servo amplifier in the SSCNET III network must be assigned a unique station address. The MR-J5 series includes tools for easy assignment and management of station addresses, facilitating seamless network integration.

Servo Parameter Download

The MR-J5 series supports the download of servo parameters via the SSCNET III interface. This feature allows for quick and efficient configuration of the servo system, reducing setup time.

Real-Time Synchronous Control

The SSCNET III interface enables real-time synchronous control of multiple servo amplifiers. This is particularly useful in complex automation systems where precise coordination of multiple axes is required.

Network Topology

The MR-J5 series supports various network topologies, including star, ring, and bus configurations. This flexibility allows engineers to design a network that best suits the specific requirements of the application.

Comparison Table: Mitsubishi MR-J5 vs Competing Servo Amplifiers

Feature	Mitsubishi MR-J5	Siemens SINAMICS S120	ABB ACSM1	Yaskawa Sigma-7
Tuning Method	Real-time auto-tuning	Auto-tuning	Auto-tuning	Auto-tuning
Vibration Suppression	Adaptive notch filter	Adaptive filters	Vibration damping	Vibration suppression
Safety Function Rating	SIL3/PLe	SIL3	SIL3	SIL2
Communication Protocol	SSCNET III/H	PROFINET	EtherCAT	EtherCAT

FAQ

Q1: What is the power rating range of the Mitsubishi MR-J5 series?

The MR-J5 series has a power rating range from 0.1kW to 110kW, making it suitable for a wide range of applications.

Q2: Does the MR-J5 series support STO (Safe Torque Off)?

Yes, the MR-J5 series includes the STO function, which is compliant with IEC 61800-5-2 and certified to SIL3/PLe levels.

Q3: What communication protocols are supported by the MR-J5 series?

The MR-J5 series supports the SSCNET III/H communication protocol, which enables high-speed, real-time communication.

Conclusion

The Mitsubishi MR-J5 series servo amplifiers offer a comprehensive solution for motion control engineers and system integrators. With advanced features such as one-touch gain tuning, sophisticated vibration suppression, robust safety functions, and high-speed communication capabilities, the MR-J5 series is well-equipped to meet the demanding requirements of modern automation applications.