Cause : Low-voltage during deceleration comes when the DC bus voltage within the drive has fallen below a set limit while the motor is either running at a constant speed or decelerating.

The Lvd error code on your Delta MS300 drive indicates a Low-voltage During Constant Speed Operation condition. This means the DC bus voltage within the drive has fallen below a set limit (Pr. 06-00) while the motor is running at a constant speed.

1. Immediately act when the DC bus voltage is lower than Pr.06-00.
2. Improve power supply condition.
3. Adjust voltage to the power range of the drive.
4. Check the power system.
5. Increase the capacity of power equipment.