Toshiba VF-A7 Set the control method of Auto-restart, Set the mode of Auto-restart

・Function

Auto-restart detect the rotating speed and direction of rotation of the motor during coasting or momentary power failure, to ensure that the motor restarts smoothly (Motor speed search function). With this parameter, you can also switch from commercial power operation to inverter operation without stopping the motor.

When this function is being performed, “” is displayed.

Step 1: Set the control method of Auto-restart

1) Restart after a momentary power failure

Input voltage

Motor speed

F-CC	ON
	OFF

★=: This function is performed when the inverter recovers from a momentary power failure after under-voltage of the main circuit and the control circuit).

Title	Function	Adjustment range	Default setting
	Auto restart	: Disabled
		: Enabled(at power failure)	
	(Motor speed search)	: Enabled(at ST ON/OFF)
		: Enabled( + )

* This function is performed in retry mode regardless of the setting of this parameter.

Setting value

or 

* The function (=,,) is activated when the reset of trip or the control power is turned on. * The function (=,) is activated when a voltage is detected in the main circuit.

2) Restart of coasting motor (Motor speed search function)

Motor speed

F-CC	ON
	OFF
ST-CC	ON
	OFF

★=: This function is performed when ST-CC are OFF and then connected again.

Title	Function	Adjustment range
	Auto restart	: Disabled
		: Enabled(at power failure)
	(Motor speed search)	: Enabled(at ST ON/OFF)
		: Enabled( + )

Default setting Setting value

 or 

※To restart the inverter in control panel operation mode, press the RUN key after a power failure.

※When (Number of PG input phases) is set at  (single phase) in PG feedback vector control mode (= ), the inverter may trip (: speed error) if the direction of rotation of the motor does not agree with.

Step 2: Set the mode of Auto-restart

[Parameter setting]

Title

Function

Adjustment range

Default setting



Auto-restart mode (When  is set at

or , set this parameter at .)

: Speed search #1 (*1),(*2),(*3)

: Restart at coasted frequency #1 (*3)

: Restart at coasted frequency #2 (*3)

: Speed search #2 (*2),(*3)

: Special method

Model

dependent

(*1),(*2),(*3): Refer to inside of box in the next page.

: This setting is for special usage. Do not set at this.

F-21