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F14 Restart Mode after Momentary Power Failure (Mode selection)
H13 (Restart Mode after Momentary Power Failure (Restart time))
H14 (Restart Mode after Momentary Power Failure (Frequency fall rate))
H15 (Restart Mode after Momentary Power Failure (Continuous running level))
H16 (Restart Mode after Momentary Power Failure (Allowable momentary power failure time))
H92 (Continuity of running (P))
H93 (Continuity of running (I))
F14 specifies the action to be taken by the inverter such as trip and restart in the event of a momentary power failure.
Restart mode after momentary power failure (Mode selection) (F14)
• Under V/f control
Description
Data for F14
Auto search disabled Auto search enabled
0: Trip immediately As soon as the DC link bus voltage drops below the undervoltage detection level due to a
momentary power failure, the inverter issues undervoltage alarm
lu
and shuts down its
output so that the motor enters a coast-to-stop state.
1: Trip after recovery
from power failure
As soon as the DC link bus voltage drops below the undervoltage detection level due to a
momentary power failure, the inverter shuts down its output so that the motor enters a
coast-to-stop state, but it does not enter the undervoltage state or issue undervoltage alarm
lu
.
The moment the power is restored, an undervoltage alarm
lu
is issued, while the motor
remains in a coast-to-stop state.
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.
As soon as the DC link bus voltage drops below the continuous running level due to a
momentary power failure, continuous running control is invoked. Continuous running
control regenerates kinetic energy from the load’s moment of inertia, continues running, and
waits the recovery of power. When an undervoltage condition is detected due to a lack of
energy to be regenerated, the output frequency at that time is saved, the output of the
inverter is shut down, and 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 when
undervoltage was detected.
If a run command has been input, restoring
power performs auto search for idling motor
speed and restarts running the motor at the
frequency calculated based on the searched
speed.
3: Continue to run
(for heavy inertia or
general loads)
This setting is ideal for fan applications with a large moment of inertia.
As soon as the DC link bus voltage drops below the undervoltage detection level due to a
momentary power failure, the inverter 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 when
undervoltage was detected.
If a run command has been input, restoring
power performs auto search for idling motor
speed and restarts running the motor at the
frequency calculated based on the searched
speed.
4: Restart at the
frequency at which
the power failure
occurred
(for general loads)
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.
As soon as the DC link bus voltage drops below the undervoltage detection level due to a
momentary power failure, the inverter 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
starting frequency specified by function
code F23.
If a run command has been input, restoring
power performs auto search for idling motor
speed and restarts running the motor at the
frequency calculated based on the searched
speed.
5: Restart at the
starting frequency
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.
Auto search is enabled by turning ON the digital terminal command STM ("Enable auto search for idling motor speed
at starting") or setting the H09 data to "1" or "2."
For details about the digital terminal command STM and auto search, refer to the description of H09 (Starting Mode,
Auto search).
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