Cause : Unknown or incompatible power board comes when the power card is incompatible with the control card. This typically occurs when the installed power card is not compatible with the control card or there's an issue with the power card itself.

"F003" fault in Schneider ATV310 drive indicate an Unknown or Incompatible Power Board fault. This means the installed power card might not be suitable for the specific drive model or control card.

Follow these steps to correct the fault:

1. Verify Power Card Compatibility: Double-check that the installed power card matches the specifications of your drive model. Refer to the drive's documentation for compatibility details.
2. Inspect Power Card: Visually inspect the power card for any signs of damage, overheating, or loose connections.