Overvoltage in power section

What does E8025 mean?

The DC bus voltage in the drive's power section has exceeded its maximum allowable limit. This is typically caused by regenerated energy from the motor that cannot be dissipated.

• Regenerative energy from the motor (e.g., during deceleration or braking) is exceeding the drive's capacity to absorb or dissipate it.
• Braking resistor either open-circuited, not connected, or undersized for the application.
• Faulty braking chopper circuit within the drive.
• Incoming AC mains overvoltage (see E2815).

Click steps to track your progress.

1. 1

   Verify the braking resistor connections and measure its resistance to ensure it is within specifications. Check for an open circuit.

2. 2

   Check the braking resistor's power rating and ensure it is adequately sized for the application's regenerative energy.

3. 3

   Increase deceleration ramps (longer braking times) in the motion profile to reduce the peak regenerative energy.

4. 4

   Check the functionality of the internal braking chopper. If the fault persists, it may indicate a defective drive.