AL031 alarm in delta ASDA-A2 servo drive indicates Incorrect wiring of the motor power line U, V, W. This means the wiring of U, V, W of the motor is incorrect connected or the connection is breakdown.

1. Incorrect wiring of the motor power line U, V, W, and GND or disconnection.
2. Check if U, V, W of the motor is incorrect connected or the connection is breakdown.