Cause : Process underload comes when the drive has detected an underload condition in the motor or application, which may signal an issue with the process or load connected to the drive.

"ULF" fault in Schneider ATV610 drive indicate process underload condition. This means mechanical root cause in the application or changed load cycle situation of the application.

1. Verify and remove the cause of the underload.
2. Verify the parameters of the "Process underload" ULD– function.