Cause : Overvoltage during acceleration comes when the DC bus voltage exceeds the drive's maximum allowable limit during the motor's acceleration phase.

"E05.00" fault in inovance MD800 drive indicate "Overvoltage during acceleration". This means the motor generates regenerative energy that the drive cannot dissipate quickly enough, causing the voltage to rise excessively.

Possible Causes:

1. Short Acceleration Time: A very short acceleration time can cause a rapid increase in the motor speed, leading to excessive regenerative energy and an overvoltage condition.
2. High Inertia Load: If the motor is connected to a load with high inertia, it can generate significant regenerative energy during acceleration.
3. Insufficient Braking Resistor: If the drive’s braking resistor is undersized, missing, or not functioning properly, it may not be able to dissipate the regenerative energy effectively.
4. Power Supply Issues: Fluctuations or issues with the power supply can contribute to overvoltage conditions during acceleration.
5. Incorrect Drive Settings: Improper parameter settings related to acceleration or braking can lead to an overvoltage fault.

Troubleshooting Steps:

1. Increase Acceleration Time:

   • Lengthen the acceleration time in the drive's parameter settings to allow the motor to reach the desired speed more gradually. This reduces the likelihood of excessive regenerative energy generation.
   • Refer to the drive's manual for guidance on setting an appropriate acceleration time for your specific application.

2. Check for High Inertia Loads:

   • Evaluate the connected load for high inertia (e.g., large flywheels or heavy machinery) that could be generating excessive regenerative energy during acceleration.
   • If necessary, consider adjusting the acceleration profile or adding external components to manage the energy more effectively.

3. Inspect the Braking Resistor:

   • Ensure that a braking resistor is installed and correctly sized for your application. The resistor should be capable of handling the regenerative energy generated during acceleration.
   • If the resistor is undersized or faulty, consider replacing it with a more capable unit to prevent overvoltage conditions.

4. Check Power Supply Stability:

   • Verify that the power supply is stable and within the required voltage range for the drive. Ensure there are no fluctuations or disturbances during acceleration.
   • Consider using a line reactor or other power conditioning equipment if the power supply is unstable.

5. Review Drive Settings:

   • Double-check the drive's parameter settings related to acceleration, deceleration, and braking to ensure they are appropriate for your motor and application.
   • Adjust settings as needed to optimize the drive's response to regenerative energy.

6. Enable Overvoltage Protection:

   • If available, enable or adjust the drive's overvoltage protection features. This can help the drive handle regenerative energy more effectively and prevent overvoltage faults.
   • Consider setting up a dynamic braking option if your application frequently generates regenerative energy.