Cause : AI1 LOSS comes when analog input AI1 signal has fallen below limit defined by parameter 3021 AI1 FAULT LIMIT. AI1 is a terminal on the drive that accepts an analog signal from an external device, such as a sensor or potentiometer.

The A2006 alarm code on your ABB ACS310 drive indicates an issue with Analog Input 1 (AI1). Specifically, the signal coming from AI1 has fallen below a set limit.

1. Check fault function parameter settings.
2. Check for proper analog control signal levels.
3. Check connections.