Cause : DC UNDERVOLTAGE comes when the intermediate circuit voltage within the drive has fallen below the acceptable operating level.

The F0006 code on your ABB ACS150 drive indicates a "DC undervoltage" fault. This means the intermediate circuit voltage within the drive has dropped below the acceptable operating range.

1. Check that undervoltage controller is on (parameter 2006 UNDERVOLT CTRL).
2. Check input power supply and fuses.