5-23
F14
H13
H14
H16
tantaneous Power Failure
Restart Mode after Ins
Restart Mode after Momentary Power Failure, Restart time
Restart Mode after Momentary Power Failure, Frequency fall rate
Restart Mode after Momentary Power Failure, Allowable momentary power
failure time
ifies the action to be taken by the inverter such as trip and restart in the event of a
n
F14 spec
momentary power failure.
Restart mode after momentary power failure (Mode selection) (F14)
Data for F14
Mode Descriptio
0
Disable restart
(Trip immediately)
As soon as the DC link bus voltage drops below the
undervoltage detection level due to a momentary power
failure, the inverter issues undervoltage alarm
lu
and
shuts down its output so that the motor enters a
coast-to-stop state.
1
Disable restart
(Trip after recovery
As soon as the DC link bus voltage drops below the
undervoltage detection level due to a momentary power
failure, the inverter shuts down its output so that the
motor enters a coast-to-stop state, but it does not enter
the undervoltage state or issue undervoltage alarm
lu
.
The moment the power is restored, an undervoltage
alarm
lu
is issued, while the motor remains in a
coast-to-stop state.
from power failure)
4
Enable restart
(Restart at the
frequency at which the
power failure occurred,
for general loads)
As soon as the DC link bus voltage drops below the
undervoltage detection level due to a momentary power
failure, the inverter saves the output frequency being
applied at that time and shuts down the output so that
the motor enters a coast-to-stop state.
If a run command has been input, restoring power
restarts the inverter at the output frequency saved
during the last power failure processing.
This setting is ideal for applications with a moment of
inertia large enough not to slow down the motor quickly,
such as fans, even after the motor enters a
coast-to-stop state upon occurrence of a momentary
power failure.
5
Enable restart
(Restart at the starting
frequency, for
low-inertia load)
After a momentary power failure, restoring power and
then entering a run command restarts the inverter at the
starting frequency specified by function code F23.
This setting is ideal for heavy load applications such as
pumps, having a small moment of inertia, in which the
motor speed quickly goes down to zero as soon as it
enters a coast-to-stop state upon occurrence of a
momentary power failure.
When the motor restarts after a momentary power failure, the auto search mode can
apply, which detects the idling motor speed and runs the idling motor without
stopping it. Refer to H09.
If you enable the "Restart mode after momentary power failure" (Function code F14 = 4 or 5), the
inverter automatically restarts the motor running when the power is restored. Design the
machinery or equipment so that human safety is ensured after restarting.
Otherwise an accident could occur.
