5.3 Description of Function Codes 5.3.1 F codes (Fundamental functions)
Restart mode after momentary power failure (operation selection)
Related function codes:
H13 (Restart timer)
H14 (frequency lowering rate)
H15 (Continuous running level)
H16 (Allowable momentary power failure time)
H92 Continuous running at the momentary power failure (P)
H93 Continuous running at the momentary power failure (I)
Sets the operation (trip operation or restart operation method, etc. following power restoration) when a momentary
power failure occurs.
Restart mode after momentary power failure (Mode selection) (F14)
V/f control (F42 = 0, 1, 2), speed sensorless vector control (motor) (F42 = 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, 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.
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 search 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 search is performed, motor speed is
estimated, and restart from the frequency.
This setting is most suitable for cases where the load moment of inertia is large, and the motor
speed drop is minimal even when the motor coasts to a stop following a momentary power
failure (fans, etc.)
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 search 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 search: Auto search is selected by starting mode selection “STM” ON or H09 (d67) = 1 or 2.
Refer to function code H09 and d67 (Starting mode) to find the detail of starting mode selection “STM” ON auto
search.
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