Cause : ULC invalid speed table comes when an invalid speed table issue within the User Load Curve (ULC) function. The ULC allows you to define a custom relationship between motor speed and load on the drive.

A8C0 warning in abb acs560 drive indicate an user load curve of X-axis points (speed) are not valid. Check that points fulfill conditions. See parameter 37.11 ULC speed table point 1.