Toshiba VF-A7 instruction manual Control mode selection, ：Motor control mode selection

5.10 Control mode selection



：Motor control mode selection

･Function

The VF-A7 has the following V/f control modes:

･Constant torque characteristic

･Variable torque mode

･Automatic torque boost *1

･Sensorless vector control (speed) *1

･Automatic torque boost + automatic energy-saving

･Sensorless vector control + automatic energy-saving *1

･V/f 5-point setting

･Sensorless vector control (torque/speed switching)

･PG feedback vector control (torque/speed switching)

･PG feedback vector control (torque/position switching)

(*1) The automatic control parameter automatically sets this parameter and the auto-tuning parameter at a time.

■Parameter setting

Title	Function	Adjustment range	Default setting
		: Constant torque characteristic
		: Square reduction torque characteristic
		: Automatic torque boost
	Motor control	: Sensorless vector control (speed)
		: Automatic torque boost + automatic energy-saving	
	mode selection	: Sensorless vector control (speed) + automatic energy-saving
		: V-f 5-points setting
		: Sensorless vector control (torque/speed switching)
		: PG feedback vector control (speed/torque switching)
		: PG feedback vector control (speed/position switching)

1) Constant torque characteristic (Normal way of use)

[Set the motor control mode selection  at (Constant torque characteristic)]

Usually, this control mode is used for loads, such as belt conveyers and cranes, that require the same torque as that produced at the rated speed, even at low speeds.

Base-frequency voltage #1 

Output voltage [V]



0

Output frequency [Hz]

Base frequency #1 

◎To further increase the torque, use the manual torque boost parameter . => Refer to 5.1.2 for details.

E-17