Upon instantaneous power failure or sudden voltage dip, the DC bus voltage of the AC drive
reduces. This function enables the AC drive to compensate the DC bus voltage reduction
with the load feedback energy by reducing the output frequency so as to keep the AC drive
running continuously.
If PA.55 = 1, upon instantaneous power failure or sudden voltage dip, the AC drive
decelerates. Once the bus voltage resumes to normal, the AC drive accelerates to the set
frequency. If the bus voltage remains normal for the time exceeding the value set in PA.57, it
is considered that the bus voltage resumes to normal.
If PA.55 = 2, upon instantaneous power failure or sudden voltage dip, the AC drive
decelerates to stop.
For details, see the fllowing figure 6-34
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