Cause : INPUT PHASE LOSS comes when the drive isn't receiving power from one of the phases in your AC supply. This alarm is generated when DC voltage ripple exceeds 14% of nominal DC voltage.

The A2026 alarm code on your ABB ACS355 drive indicates an INPUT PHASE LOSS. This means the drive is detecting a problem with the power supply feeding the motor.

1. Check input power line fuses.
2. Check for input power supply imbalance.
3. Check fault function parameters.