Overvoltage in power section

Was bedeutet E8025 ?

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).

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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.