E6582175
E-21
5
5.9 Auto-restart (Restart of coasting motor)
f301 : Auto-restart control selection
Caution
Mandatory
action
Stand clear of motors and mechanical equipment
If the motor stops due to a momentary power failure, the equipment will start suddenly when power is
restored.
This could result in unexpected injury.
Attach caution label about sudden restart after a momentary power failure on inverters, motors and
equipment for prevention of accidents in advance.
Function
The f301 parameter detects the rotating speed and rotational direction of the motor during coasting at
the event of momentary power failure, and then after power has been restored, restarts the motor
smoothly (motor speed search function). This parameter also allows switching from commercial power
operation to inverter operation without stopping the motor.
During operation, "rtry" is displayed.
[Parameter setting]
Title Function Adjustment range Default setting
f301
Auto-restart control
selection
0: Disabled
1: At auto-restart after momentary stop
2: At ST terminal off and on
3: 1 2
4: At start-up
0
* If the motor is restarted in retry mode, this function will operate, regardless of the setting of this parameter.
1) Auto-restart after momentary power failure (Auto-restart function)
Input voltage
Motor speed
Forward / reverse
ON
OFF
Setting f301 to 1 or 3: This function operates after power has been restored following detection of an
undervoltage by the main circuits and control power.
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