A33 fault in Emotron VS Series Drive indicates Pre-warning of Weak Light. This means the drive's output frequency has remained at or below the lower limit of the PI output for longer than the set delay time, indicating a low-energy/weak light condition.

Possible Causes: Output frequency is lower than or equal with lower limit of PI output frequency, and has continued under this state for a duration greater than delay time of weak light.

Solutions: Check the lower limit of PI output frequency and weak-light delay the set value.