Cause : Under voltage comes when the voltage of the main circuit is lower than the standard voltage. The power supply connected to the drive may be providing a lower voltage than the rated voltage of the drive.

AL003 alarm in delta servo drive indicates Under voltage. This means the input voltage of the main circuit is lower than the rated allowable voltage.

1. Check if the input voltage wiring of the main circuit is normal.
2. Use the voltmeter to see if the voltage of the main circuit is normal.
3. Check input fuses.
4. Re-confirm the voltage wiring.