Toshiba instruction manual VF-A7 inverter has been set to this control mode by default

■(Automatic V/f mode setting) and (Motor control mode selection)

The automatic control parameter is designed to set motor control mode selection parameter

() and the auto-tuning parameter() by one operation. Therefore, changing the  setting causes the settings of all related parameters to be changed automatically.

			Parameters set automatically
				
  is always displayed.			Check the  setting (set value).
		 ((constant torque) if no change is		－
			made to )
	Automatic torque boost		Automatic torque boost	Executed (Returns
				to  after
	+auto-tuning
				execution)
	Vector control (speed) +		Sensor-less vector control	Executed (Returns
				to  after
	auto-tuning		(speed control)
				execution)
	Automatic energy-saving +		Automatic energy-saving +	Executed (Returns
				to  after
	auto-tuning		sensorless vector control
				execution)

4)To increase torque manually (V/f constant control)

The VF-A7 inverter has been set to this control mode by default.

This control mode in which the torque is kept constant is suitable for belt conveyers, and so on. It is recommended to select this mode if you want to manually increase the starting torque.

To return to the V/f constant control mode after changing the setting of the parameter ,

Set the motor control mode selection parameter  at (constant torque)

=> Refer to 5.10

Note 1) If there is a need to further increase the torque, increase the torque boost rate, using the manual torque boost parameter . For the procedure for setting the manual torque

boost parameter  => Refer to 5.12)

2)The square reduction torque characteristic (set the motor control mode selection parameter at ) is effective in controlling such loads as fans and pumps.

=> Refer to 5.10

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