5-44
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Chap. 5 FUNCTION CODES
• Under vector control without speed sensor
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 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.
Even if the F14 data is set to "3," the "Continue to run" function is disabled.
3: Continue to run
(for heavy inertia or
general loads)
4: Restart at the
frequency at which
the power failure
occurred
(for general loads)
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.
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 d67 data to "1" or "2."
For details about the digital terminal command STM and auto search, refer to the description of d67 (Starting Mode,
Auto search).
• Under vector control with speed sensor
Data for F14 Description
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.
3: Continue to run
(for heavy inertia or
general loads)
4: Restart at the
frequency at which
the power failure
occurred
(for general loads)
5: Restart at the starting
frequency
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.
Even if the F14 data is set to "3," the "Continue to run" function is disabled.
If a run command has been input, restoring power restarts the inverter at the motor speed
detected by the speed sensor.
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