Cause : UNDERLOAD comes when motor load is too low due to, for example, release mechanism in driven equipment. This means the motor connected to the drive isn't under enough load to operate properly.

The A2011 code on your ABB ACS150 drive signifies an underload alarm. This indicates that the motor connected to the drive isn't experiencing enough load to operate within its intended range.

1. Check for problem in driven equipment.
2. Check fault function parameter settings.
3. Check motor power against drive power.