5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
V/f control with speed sensor (F42 = 3), dynamic torque vector control with speed sensor (F42 = 4), vector control
with speed sensor (F42 = 6, 16)
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.
When auto-started from momentary power failure, undervoltage alarm lV is output.
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 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 lV is issued.
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 recovery from power failure, restart from the motor speed detected
with the speed sensor.
4: Restart from frequency
at power failure
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 recovery from power failure, restart from the motor speed detected
with the speed sensor.
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