AL289 alarm in delta ASDA-A2 servo drive indicates Feedback position counter overflows. This means a position counter reaches its maximum limit and wraps around to its minimum value, causing a loss of accurate position information. 

1. Set the gear ratio properly according to the total traveling distance of the absolute motor and the actual application requirements to avoid the feedback position counter overflow.
2. If you have set P2-69.Z to 1 to disable the index coordinate overflow function, set P2-70 [Bit 2] to 1.