Cause : Undervoltage comes when the power unit has detected an undervoltage condition in the DC link. When encountering a DC link voltage undervoltage fault with a inovance drive, it indicates that the voltage level in the DC link has dropped below the acceptable threshold.
- line supply failure
- line supply voltage below the permissible value.
- line phase interrupted.
The fault code "09" on inovance drives indicates a DC link under-voltage condition. This fault occurs when the voltage level in the DC link falls below the minimum acceptable limit. Here are steps to address this issue:
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Check Input Power: Verify that the input power to the drive is stable and within the specified voltage range. An under-voltage condition can occur due to insufficient input voltage. Ensure that the power supply meets the drive's requirements and there are no issues with the mains power.
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Inspect Power Supply: Check for any issues with the power supply unit supplying power to the drive. This could include loose connections, damaged cables, or problems with the power source itself. Ensure that the power supply unit is functioning correctly and delivering adequate voltage to the drive.
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Inspect Capacitors: Capacitors in the DC link circuit store energy and help maintain a stable voltage level. Inspect the capacitors for signs of damage or degradation, such as bulging or leaking. Replace any faulty capacitors.
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Review Load Conditions: An under-voltage condition may occur if the load on the drive is too high or if there are sudden changes in load. Monitor the load conditions and reduce the load if necessary. Adjust parameters such as acceleration/deceleration ramps to prevent sudden voltage drops.
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Check Motor Parameters: Verify that the motor parameters are correctly configured in the drive's settings. Incorrect motor parameters or mismatches between the drive and motor specifications can lead to under-voltage issues.
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Check for Faulty Components: Inspect the drive's internal components for any faults or damage. This could include issues with the power module, control board, or other electronic components. Replace any faulty components as needed.
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Review Drive Settings: Check the drive's control parameters and settings related to voltage limits, braking behavior, and DC link protection. Ensure that the settings are appropriate for the application and adjust them as necessary.
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External Protection Devices: Consider installing external protection devices such as surge suppressors or voltage regulators to stabilize the voltage supply and protect the drive from under-voltage conditions.
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Consult Technical Documentation: Refer to the drive's user manual, technical documentation.
By following these steps and addressing the potential causes, you can troubleshoot and resolve the DC link under-voltage fault in your inovance drive.
