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F14
H13
H14
H16
Restart Mode after Momentary Power Failure (Mode selection)
Restart after Momentary Power Failure (Restart time)
(Frequency fall rate)
(Allowable momentary power failure time)
F14 specifies the action to be taken by the inverter such as trip and restart in the event of a
momentary power failure.
Restart mode after momentary power failure (Mode selection) (F14)
Data for F14 Mode Description
0 Disable restart
(Trip immediately)
As soon as the DC link bus voltage drops below the
undervoltage detection level upon a momentary power failure,
the output of the inverter is shut down, with undervoltage alarm
lu
issued, and the motor enters a coast-to-stop state.
1 Disable restart
(Trip after a
recovery from
power failure)
As soon as the DC link bus voltage drops below the
undervoltage detection level upon a momentary power failure,
the output of the inverter is shut down, the motor enters a
coast-to-stop state, but no undervoltage alarm
lu
issued.
When power is restored, an undervoltage alarm
lu
is issued,
while the motor remains in a coast-to-stop state.
3
Enable restart
(Continue to run, for
heavy inertia or
general loads)
When the DC link bus voltage drops below the continuous
running level upon a momentary power failure, continuous
running control is invoked. Continuous running control
regenerates kinetic energy from the load’s moment of inertia,
slowing down the motor and prolongs the running time. When
an undervoltage condition is detected due to a lack of energy to
be regenerated, the output frequency at that time is saved, the
output of the inverter is shut down, and the motor enters a
coast-to-stop state.
When power is restored, if a run command has been input,
restart begins at the reference frequency saved during the
power failure processing. This setting is ideal for fan
applications with a large moment of inertia.
4 Enable restart
(Restart at the
frequency at which
the power failure
occurred, for
general loads)
As soon as the voltage of the DC link bus drops below the
undervoltage detection level upon a momentary power failure,
the output frequency at the time is saved, the output of the
inverter is shut down, and the motor enters a coast-to-stop
state.
When power is restored, if a run command has been input
restart begins at the reference frequency saved during the
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 at the
starting frequency,
for low-inertia load
After a momentary power failure, when power is restored and
then a run command is input, restart will begin at the starting
frequency commanded 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.
If you enable the "Restart mode after momentary power failure" (Function code F14 = 3, 4, or 5), the
inverter automatically restarts the motor running when the power is recovered. Design the machinery
or equipment so that human safety is ensured after restarting.
Otherwise an accident could occur.
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