AL283 alarm in delta servo drive indicates Forward Software Limit. This means the value of position command is bigger than forward software limit (P5-08).

1. Forward Software Limit is determined by the position command, not the actual feedback position. It is because the command will arrive first and then the feedback.
2. When the protection function is activated, the actual position might not over the limit. Therefore, setting an appropriate decelerating time could satisfy the demand.