Set the operation for when momentary power failure occurs (trip operation, restart operation method at
auto-restarting)
■ Restart mode after momentary power failure (Mode selection) (F14)
V/f control (F42=0,2,3), dynamic torque vector control(F42=1,4), PM motor control(F42=15)
F14 data
Operation contents
Without auto search With auto search
0: Trip immediately When momentary power failure occurs while operating the inverter, and at the time when
undervoltage is detected by the DC link bus voltage of the inverter, undervoltage alarm lu is
outputted, the inverter output shuts down, and the motor coasts to a stop.
1: Trip after a recovery
from power failure
When momentary power failure occurs while operating the inverter, and at the time when
undervoltage is detected by the DC link bus voltage of the inverter , the inverter output shuts down
and the motor coasts to stop, but the undervoltage alarm will not be outputted.
When auto-started from momentary power failure, undervoltage alarm lu is outputted.
2: Trip after momentary
deceleration is stopped
As soon as the DC link bus voltage drops below the continuous
power failure, decelerate-to-stop 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.
3: Continue to run
(for heavy inertia load
or general load)
As soon as the DC link bus voltage drops below the continuous running level due to a momentary
power failure, decelerate-to-stop control is invoked.
Decelerate-to-stop control regenerates kinetic energy from the load's moment of inertia, slowing
down the motor, and operation is continued to wait for auto-restarting. If there is not enough
energy for regeneration and when undervoltage is detected, the inverter output shuts down and
the motor coasts to a stop.
If run command is entered at auto-restarting,
restart from the frequency of when undervoltage
is detected.
If run command is entered at auto-restarting,
auto-searching is performed, motor speed is
estimated, and restart from the frequency.
This setting is most suitable for the fan with large inertia moment of load.
4: Restart from frequency
at power failure
(for general load)
When momentary power failure occurs while operating the inverter, and at the time when
undervoltage is detected by the DC link bus voltage of the inverter, the inverter output shuts down,
and the motor coasts to a stop.
If run command is entered at auto-restarting,
restart from the frequency of when undervoltage
is detected.
If run command is entered at auto-restarting,
auto-searching is performed, motor speed is
estimated, and restart from the frequency.
This setting is most suitable for the case (fan) when load inertial moment is large, and motor
speed does not decrease so much even if the motor coasts to a stop due to momentary power
failure.
5: Restart from starting
frequency
When momentary power failure occurs while operating the inverter, and at the time when
undervoltage is detected by the DC link bus voltage of the inverter, the inverter output shuts down,
and the motor coasts to a stop.
If run command is entered at auto-restarting,
restart from the starting frequency that was set
by function code F23.
If run command is entered at auto-restarting,
auto-searching is performed, motor speed is
estimated, and restart from the frequency.
This setting is most suitable for the case (pump etc.) when load inertia moment is small, when the
load is heavy, and motor speed decreases up to 0 in a short time after the motor coasts to a stop
due to momentary power failure.
With auto-searching: Auto-searching is selected by starting mode selection “STM” ON or H09/d67 = 1 or 2.
Refer function code H09/d67 (Starting mode) to find the detail of starting mode selection “STM” ON auto-searching.
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