Delta ALVN fault code meaning

Series: AFE3000

AC undervoltage during operation

active front end

Meaning: Undervoltage detected at the power supply input terminals during operation.

Possible causes

• Power failure occurred
• Incorrect active front end model selected
• Supply voltage fluctuation
• Check whether a large-capacity load starts
• Increase the capacity of the power supply system equipment.
• 7-33

Source: AFE3000 Series User Manual (DELTA_IA-PQ_AFE3000_UM_TC_20260330) P123