5-32
Data for F14
Mode Description
2 Trip
after
decelerate-to-stop
As soon as the DC link bus voltage drops below the
continuous running level due to a momentary power
failure, decelerate-to-shop control is invoked.
Decelerate-to-stop control regenerates kinetic energy
from the load's moment of inertia, slowing down the
motor and continuing the deceleration operation. After
decelerate-to-stop operation, an undervoltage alarm
lu
is issued.
(Available in the ROM version 0500 or later.)
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.
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.
