Cause : Internal serial link fault comes when communication interruption between the internal cards. This typically occurs when there's a communication issue between the internal cards of the drive.

"F004" fault in Schneider ATV310 drive indicates an Internal serial link fault. This means there is an communication issue between the internal components of the drive.

Follow these steps to correct the fault:

1. Power Cycle: A simple power cycle can sometimes resolve temporary communication issues. Turn off the drive, wait for a few minutes, and then turn it back on.
2. Check Connections: Ensure all internal connections within the drive are secure and free from any damage.