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E6581090
F-14
6
• Function
This parameter detects the rotational speed and direction of rotation of the motor during coasting in the
event of a momentary power failure, and restarts the motor smoothly as soon as power is restored (motor
speed search function). Also, this parameter makes it possible to switch from commercial power operation to
inverter operation without stopping the motor.
During restart operation, the message “
” is displayed.
Title Function Adjustment range Default setting
Auto-restart control
selection
0: Disabled
1: At auto-restart after momentary stop
2: When ST-CC is turned on or off
3: At auto-restart after momentary stop or
when ST-CC is turned on or off
0
* When the motor restarts in retry mode, this function will be activated regardless of the
parameter setting.
1) Auto-restart after momentary power failure (auto-restart function)
Input voltage
Motor speed
F-CC
ON
OFF
★ set to () : This function is activated when the power is restored after the main
circuits and control power supply has detected an undervoltage.
2) Start of motor during coasting (Motor speed search function)
Input voltage
F-CC
ON
OFF
R (ST)-CC
ON
OFF
* The ST (standby signal) function is not assigned to any terminal.
If necessary, assign this function to an unassigned terminal,
using the multi-function programmable terminal function.
★ set to (): The auto-restart function is activated when R(ST)-CC is short-circuited
after they have been opened.
Notes
• A waiting time between 200 and 300 msec is preset to allow the residual voltage in the
motor to come down to a specified level during restart. For this reason, the start-up
takes more time than usual.
• Use this function when operating a system with one inverter connected with one motor.
This function may not be performed properly in a system with one inverter connected
with multiple motors.
Application to a crane or hoist
The crane or hoist might allow the load to move downward during the time elapsed
before the motor starts after receiving an operation starting command. When applying
the inverter to such a lifting gear, set the auto-restart control selection parameter to 0
(disabled) and avoid using the retry function.