Function Application
‑669‑
Parameters
Para.
Function
Default Value
Range
Description
F9‑59
Power dip ride‑
through function
selection
0 0:
Disabled
1: Bus
voltage
constant
control
2:
Decelerate
to stop
3: Voltage
dip
depres
sion
The function enables the AC drive
to keep running at occurrence of
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.
0: Disabled
Power dip ride‑through is
disabled.
1: Bus voltage constant control
When the system encounters a
power failure, the AC drive keeps
the bus voltage around the
"threshold for enabling power dip
ride‑through". In this mode, when
the grid voltage recovers, the AC
drive restores the target output
frequency based on the
acceleration time.
Contin
ued
Continued Continued Continued 2: Decelerate to stop
When the system encounters a
power failure, the AC drive
decelerates to stop. In this mode,
when the power grid resumes
power supply, the AC drive
continues decelerating to 0 Hz and
stops, and will restart only after
receiving a start command.
3: Voltage dip depression
This function prevents AC drive
stop caused by undervoltage when
instantaneous power failure
occurs due to voltage dip. You can
use F9‑66 to set the voltage dip
suppression time.
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