Function Application
‑668‑
Related parameters
Para. Function Default
Value Range Description
F9‑69
Excessive speed
deviation threshold
20.0%
0.0% to 50.0% (max.
frequency)
‑
F9‑70
Detection time of
excessive speed
deviation
5.0s 0.0s to 60.0s
3.7.9 Power Dip Ride-Through
The power dip ride‑through function ensures continuous system running upon
instantaneous power failure. When the system encounters a power failure, the AC
drive makes the motor work in the generating state to keep the bus voltage around
the "threshold for enabling power dip ride‑through". This function prevents the AC
drive from stopping due to input undervoltage, as shown in the following figure.
Figure 3‑83 Power dip ride‑through
In the "bus voltage constant control" mode, when the grid resumes power supply, the
AC drive restores the target output frequency based on the acceleration time. In the
"decelerate to stop mode", when the grid resumes power supply, the AC drive
decelerates to 0 Hz and stops, and will restart only after receiving a start command.
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