PU board powerfail

What does A5EB mean?

A power supply failure has occurred on the power unit (PU) board. This indicates an internal issue with the drive's power unit, specifically its power supply circuitry.

• Failure of internal power supply components on the power unit board.
• An internal short circuit or overload condition within the power unit's circuitry.
• Damage to the power unit board due to overvoltage transients, environmental stress, or component degradation.
• Loose or intermittent internal connections affecting the power supply to the PU board.

Click steps to track your progress.

1. 1

   Perform a controlled power cycle of the drive to clear any transient states and allow for a potential reset of internal power supplies.

2. 2

   Inspect the power unit visually for any signs of physical damage, such as burnt components, bulging capacitors, or loose internal wiring connections.

3. 3

   Verify the stability and correctness of the incoming AC supply voltage to the drive.

4. 4

   If the warning persists after power cycling and external checks, this typically indicates an internal hardware failure of the power unit.

5. 5

   Contact ABB support, providing the drive model, serial number, and detailed fault information for internal power unit diagnosis and potential replacement.