Function Application
‑670‑
Para.
Function
Default Value
Range
Description
F9‑60
Threshold for
recovering from
power dip ride‑
through
85% 80% to
100%
This parameter is used to set the
threshold for recovering from
power dip ride‑through for the AC
drive. 100% corresponds to 540 V.
This value is slightly lower than
the bus voltage before power
failure.
Upon grid power failure, the bus
voltage is maintained around
F9‑62 (threshold for enabling
power dip ride‑through). When the
power supply recovers, the bus
voltage rises from F9‑62 (threshold
for enabling power dip ride‑
through) to F9‑60 (threshold for
recovering from power dip ride‑
through). During this period, the
output frequency of the AC drive
keeps decreasing until the bus
voltage reaches F9‑60 (threshold
for recovering from power dip
ride‑through).
F9‑61
Duration for
judging voltage
recovery from
instantaneous
power failure
0.5s 0.0s to
100.0s
This parameter is used to set the
time required for the bus voltage
to rise from F9‑60 (threshold for
recovering from power dip ride‑
through) to the voltage before
power failure.
F9‑62
Threshold for
enabling power
dip ride‑through
80% 60% to
100%
This parameter is used to set the
voltage level at which the bus
voltage is maintained upon power
failure. Upon power failure, the
bus voltage is maintained around
F9‑62 (threshold for enabling
power dip ride‑through).
F9‑71
Power dip ride‑
through gain
0 to 100 40
This parameter is valid only in the
"bus voltage constant control" (F9‑
59 is set to 1) mode.
If undervoltage is likely to occur
during power dip ride‑through,
increase the power dip ride‑
through gain and the power dip
ride‑through integral coefficient.
F9‑72
Power dip ride‑
through integral
coefficient
0 to 100 30
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