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5-67 5. [Fundamental operation] How to use parameters
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5. 4. 2 Restarting smoothly after momentary power failure
<F301: Auto-restart>
■ Function
The motor that is coasting due to momentary power failure is accelerated immediately after the
power is restored (auto-restart function).
In addition, this parameter detects the motor speed and direction of rotation of the motor during
coasting at the time of startup, and allows switching from commercial power operation to inverter
operation without stopping the motor(motor speed search function).
■ Parameter setting
■ Selecting a setting value
1: Power failure
The motor that is coasting due to momentary power failure is accelerated immediately after the
power is restored.
It is operated after power is restored after power circuit undervoltage is detected. Turn on the run
command.
CAUTION
Mandatory
action
• When the auto-restart after momentary stop function is selected, stand clear of motors and
machines at momentary power failure.
The motors and machines which have stopped due to momentary power failure will restart
suddenly after power is restored, and this will result in injury.
• Attach caution labels indicating functions programmed for Auto restart, on inverters, motors and
machines.
Please prevent accidents with the caution labels.
Title Parameter name Adjustment range
Default
setting
F301 Auto-restart 0: Disabled
1: Power failure
2: Terminal ST On/Off
3: Terminal ST On/Off or power failure
4: At startup
0
0.0HzSTOP
15:35
F301 : Auto-restart
0: Disabled
1: Power failure
2: Terminal ST On/Off
3: ST On/Off or power failure
4: At startup
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