Cause : DC link undervoltage comes when the intermediate circuit DC voltage is not sufficient because of a missing supply phase or blown fuse.

DC link undervoltage "3E05" fault in an ABB ACS880 drive indicates that the voltage in the DC link has dropped below the acceptable operating range. This condition can prevent the drive from functioning properly and may lead to operational issues.

1. Check supply cabling, fuses and switchgear.
2. Check that parameter 95.1 Supply voltage is set according to the supply voltage in use.