Cause : Overvoltage during deceleration comes when the DC bus voltage has exceeded the permissible limit while the motor is decelerating.

"E06.00" fault in inovance MD800 drive indicate "Overvoltage during deceleration". This means the motor generates excessive regenerative energy during deceleration, which the drive cannot dissipate quickly enough, leading to a rise in the DC bus voltage.

Possible Causes:

1. Short Deceleration Time: A very short deceleration time can cause the motor to stop too quickly, resulting in a significant amount of regenerative energy that the drive cannot handle.
2. High Inertia Load: If the motor is driving a load with high inertia (e.g., a heavy flywheel), it can generate a large amount of regenerative energy during deceleration.
3. Insufficient Braking Resistor: An undersized or faulty braking resistor may not be able to dissipate the regenerative energy effectively, leading to overvoltage.
4. Incorrect Drive Settings: Inadequate settings related to deceleration and braking can contribute to the drive's inability to manage regenerative energy.
5. Power Supply Issues: Fluctuations in the power supply can exacerbate overvoltage conditions during deceleration.

Troubleshooting Steps:

1. Increase Deceleration Time:

   • Lengthen the deceleration time in the drive’s parameter settings. A longer deceleration time allows the motor to slow down more gradually, reducing the amount of regenerative energy generated.
   • Refer to the drive’s manual for guidelines on setting an appropriate deceleration time for your specific application.

2. Evaluate Inertia of the Load:

   • Check if the load has high inertia, which can cause a large amount of regenerative energy during deceleration.
   • If the load has high inertia, consider increasing the deceleration time or using an external braking resistor.

3. Inspect and Size the Braking Resistor:

   • Verify that a braking resistor is installed, properly sized, and functioning correctly. The resistor needs to be capable of dissipating the regenerative energy generated during deceleration.
   • If necessary, replace the braking resistor with one that has a higher power rating.

4. Review Drive Settings:

   • Check the drive’s parameters related to braking and deceleration to ensure they are correctly configured. Incorrect settings can lead to the drive’s inability to handle regenerative energy efficiently.
   • Adjust the settings, such as dynamic braking and DC bus voltage limits, to optimize performance during deceleration.

5. Check Power Supply Stability:

   • Ensure that the power supply to the drive is stable and within the required voltage range. Power supply fluctuations can contribute to overvoltage conditions.
   • Use a line reactor or other power conditioning devices if the power supply is unstable.

6. Inspect Drive and Motor:

   • Check the drive and motor for any signs of damage or malfunction that might contribute to overvoltage during deceleration.
   • Test the drive with a different motor or the motor with a different drive to identify if one component is causing the issue.

7. Enable Overvoltage Protection:

   • If the drive supports it, enable or adjust the overvoltage protection features to better handle the regenerative energy during deceleration.
   • Consider implementing a dynamic braking unit or chopper to help dissipate the excess energy more effectively.