Cause : ULC invalid underload table comes when user load curve: Underload curve points are not valid. Check that points fulfill conditions. See parameter 37.21 ULC underload point 1.

The warning "A8C5 ULC Invalid Underload Table" on an ABB ACS560 drive indicates that the Underload Control (ULC) settings have an invalid configuration or the underload table is corrupted. This can prevent the drive from properly monitoring and responding to underload conditions.