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Analysis of Frequent Err02 Faults in Textile Machinery

Views: 891 Author: Site Editor Publish Time: 2025-03-18 Origin: Site

Case Background: In a textile enterprise, multiple ANYHZ brand FST-650L series inverters were used. During the operation of a textile machine, Err02 overcurrent faults frequently occurred, causing the equipment to fail to operate normally and affecting production efficiency. To solve this problem, the technicians conducted a detailed investigation and analysis.

Fault phenomenon

Random overcurrent in the acceleration stage: During the acceleration process, the equipment will randomly have overcurrent faults, causing the equipment to shut down.
Irregular shutdown: There is no obvious pattern in the time and frequency of the fault, which is difficult to predict.

Troubleshooting process

Insulation test: The insulation tester was used to detect the motor windings, and it was found that the insulation resistance of the motor windings to the ground was less than 1MΩ, indicating that the motor windings may have insulation aging or short circuit problems.
Thermal imaging detection: The U-phase IGBT temperature was observed to be abnormal through the thermal imager, and the temperature difference ΔT=15℃, indicating that the IGBT of this phase may be overloaded or faulty.
Oscilloscope detection: Use an oscilloscope to capture the current waveform and find that there are high-frequency glitches in the waveform, which may be caused by the failure of the driver board filter capacitor or the aging of the motor insulation.

Root cause analysis

Aging of motor insulation: The insulation resistance of the motor winding to the ground is reduced, resulting in abnormal increase of current during acceleration, triggering overcurrent protection.
Failure of the driver board filter capacitor: Failure of the filter capacitor will cause high-frequency glitches in the current waveform, affecting current detection and control, and further causing overcurrent faults.

Solution

Replace the motor: Due to the aging of the motor insulation, a new motor needs to be replaced to ensure the normal operation of the equipment.
Upgrade the output reactor: Upgrading the output reactor can effectively suppress high-frequency glitches, improve the stability of the current waveform, and reduce the occurrence of overcurrent faults.

Preventive measures

Regular maintenance: Regularly inspect and maintain the motor and driver board to detect and deal with potential problems in a timely manner.
Environmental optimization: Ensure that the operating environment temperature of the equipment is suitable and well ventilated to reduce the impact of high temperature and humidity on the equipment.
Parameter optimization: Reasonably set the parameters of the inverter, such as acceleration/deceleration time, torque compensation, etc., to avoid faults caused by improper parameter settings.

Conclusion:

Through this troubleshooting and resolution, we realize the importance of regular maintenance and environmental optimization for the stable operation of equipment. At the same time, accurate fault diagnosis and reasonable solutions are the key to quickly resuming production. In future work, we will strengthen the daily maintenance of equipment, improve the technical level of operators, and ensure the efficient operation of equipment.

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