Power Interruption Restart Mode Selection (F14)
F14 data
Operation details
Without auto search
With auto search
*1
0: Immediately trip
If a momentary power failure occurs while the inverter is operating and an undervoltage
is detected in the Main Circuit DC V
oltage of the inverter, the undervoltage alarm LU is
output at that time, the inverter output is cut of
f and the motor enters the free-run state.
1: Trip after a recov-
ery from power fail-
ure
If a momentary power failure occurs while the inverter is operating and an undervoltage
is detected in the Main Circuit DC Voltage of the inverter, the inverter output is cut of
f at
that time and the motor enters the free-run state, but no undervoltage alarm is generat-
ed. During power restoration from a momentary power failure, an undervoltage alarm LU
is output.
2: Trip after deceler-
ate-to-stop
If a momentary power failure occurs while the inverter is operating and the Main Circuit
DC Voltage of the inverter falls below the continuous running level, the deceleration stop
control is started. During deceleration stop control, the kinetic energy of the moment of
inertia of the load is regenerated due to deceleration, and the deceleration operation
continues.
After the deceleration stop, the LU alarm is output.
3: Continue to run
If a momentary power failure occurs while the inverter is operating and the Main Circuit
DC Voltage of the inverter falls below the continuous running level, the operation continu-
ation control is started. During continuous running control, the kinetic energy of the mo-
ment of inertia of the load is regenerated due to deceleration, and the operation contin-
ues and power restoration is awaited. If the energy to be regenerated is low and an un-
dervoltage is detected, the inverter output is cut off, and the motor falls in a free-run
state.
If the RUN command is input during power
restoration, restart is performed from the
pull-in frequency. Select the pull-in fre-
quency at Starting Frequency Selection at
Frequency Pull-in Restart (E152).
If the RUN command is input during power
restoration, auto search is performed, the
motor speed is estimated, and restart is
performed from the frequency
.
4: Restart at the fre-
quency
If a momentary power failure occurs while the inverter is operating and an undervoltage
is detected in the Main Circuit DC Voltage of the inverter, the inverter output is cut of
f and
the motor enters the free-run state.
If the RUN command is input during power
restoration, restart is performed from the
pull-in frequency. Select the pull-in fre-
quency at Starting Frequency Selection at
Frequency Pull-in Restart (E152).
If the RUN command is input during power
restoration, auto search is performed, the
motor speed is estimated, and restart is
performed from the frequency.
6: Decelerate-to-
stop(w/o trip)
If a momentary power failure occurs while the inverter is operating and the Main Circuit
DC Voltage of the inverter falls below the continuous running level, the deceleration stop
control is started. During deceleration stop control, the kinetic energy of the moment of
inertia of the load is regenerated due to deceleration, and the deceleration operation
continues. An alarm does not occur after a deceleration stop.
If the RUN command turns OFF in the deceleration stop state, the deceleration stop
state is canceled, and the operation can be performed when the RUN command turns
ON the next time.
*1. With auto search is selected when Enable auto search for idling motor speed at starting “STM” is ON, or
Motor Starting Mode Auto Search Function Selection (H09/d67) = 1 or 2.
When a motor control method with speed sensor is selected, restart is performed from the motor speed de-
tected by the speed sensor. In the case of a motor control method without speed sensor, restart is per-
formed from the estimated speed.
7 Other Functions
7-51
M1 Series Standard Type User's Manual (I669)
7-4 Restart Functions
7
7-4-2 Restart after Momentary Power Failure
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