Cause : HMI communication interruption comes when communication interruption with the "Graphic display terminal". This error is triggered when the command or reference value are given using the Graphic Display Terminal and if the communication is interrupted during more than 2 seconds.

"SLF3" fault in Schneider drive indicate "HMI communication" fault. This means there's an issue with the communication between the drive and its graphical keypad (HMI).

1. Verify the Graphic display terminal connection.
2. Verify that the cable length does not exceed 10 m.