5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
When momentary power failure restart operation (F14 = 3 to 5) is selected, operation will resume automatically at
auto-restarting. Design your machinery so that safety is ensured even at restarting.
Failure to observe this could result in an accident.
Speed sensorless vector control (permanent magnet synchronous motor) (F42 = 15)
Table 5.3-1
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 lV 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 output.
Undervoltage alarm lV is output when the power is restored following a momentary power failure.
2: Trip after momentary
deceleration is
stopped
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 started.
Decelerate-to-stop control regenerates kinetic energy from the load's moment of inertia, slowing
down the motor and continuing the deceleration operation.
An lV alarm is output after the motor decelerates and stops.
3: Continue to run (for
heavy inertia load or
general load)
Continue to run control is started the moment a momentary power failure occurs while the inverter
is running, and the inverter DC intermediate circuit voltage drops to or below the continue to run
level.
With continue to run control, kinetic energy for the load moment of inertia is regenerated as the
motor decelerates in order to continue operation while waiting for power to be restored.
If the regenerated energy is low and undervoltage is detected, inverter output is shut off, and the
motor coasts to a stop.
If a run command has been input when the power is restored, auto search is performed to
estimate the motor speed, and operation resumes from that frequency.
This setting is most suited to applications such as large fans with large load moment of inertia.
4: Restart from
frequency at power
failure (for general
loads)
5: Restart from starting
frequency
The operation is the same for either F14 = 4 or 5.
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, auto search is performed, motor speed is estimated,
and restart from the frequency.
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