Toshiba VF-AS1 instruction manual If vector control cannot be programmed

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1) Increasing torque automatically according to the load

Set the automatic torque boost ￿￿￿=￿ (automatic torque boost+auto-tuning 1)

Automatic torque boost ￿￿￿=￿ detects load current in all speed ranges and automatically adjusts voltage output from inverter. This gives steady torque for stable runs.

Note 1: The same characteristic can be obtained by setting the V/f control mode selection parameter ￿￿ to ￿

(automatic torque boost) and ￿￿￿￿ (auto-tuning 1) to ￿. ￿ Refer to Section 6.22.

Note 2: Setting ￿￿￿ to ￿ automatically programs ￿￿ to ￿.

Note 3: If stable operation cannot be achieved with this setting, set the parameters ￿￿ (base frequency), ￿￿￿

(base-frequency voltage), ￿￿￿￿ (rated capacity of motor), ￿￿￿￿ (rated current of motor) and ￿￿￿￿

(rated number of revolutions of motor) as specified on the motor nameplate, and then set ￿￿￿￿ to ￿ and ￿￿￿ to ￿ again.

2)When using vector control (increasing starting torque and high-precision operations)

Set the automatic torque boost ￿￿￿=￿ (sensorless vector control 1+auto-tuning 1)

	Setting automatic torque boost ￿￿￿=￿ (Sensorless vector control 1+auto-tuning 1) provides high starting torque
	bringing out the maximum in motor characteristics from the low-speed range. This suppresses changes in motor
	speed caused by fluctuations in load to provide high precision operation. This setting is most suitable for transfer
	and lifting systems that are operated in speed control mode.
	Note 1: The same characteristic can be obtained by setting the V/f control mode selection parameter ￿￿ to ￿
	(Sensorless vector control 1) and ￿￿￿￿ (Auto-tuning 1) to ￿. ￿ Refer to Section 6.22.
5	Note 2: Setting ￿￿￿ to ￿ automatically programs ￿￿ to ￿.
	Note 3: If stable operation cannot be achieved with this setting, set the parameters ￿￿ (base frequency), ￿￿￿
	(base-frequency voltage), ￿￿￿￿ (rated capacity of motor), ￿￿￿￿ (rated current of motor) and ￿￿￿￿
	(rated number of revolutions of motor) as specified on the motor nameplate, and then set ￿￿￿￿ to ￿
	and ￿￿￿ to ￿ again.
	If vector control cannot be programmed....
	First read the precautions about vector control in 5.6, 9).
	1) If the desired torque cannot be obtained￿	￿ Refer to 6.22 selection 3.
	2) If auto-tuning error “￿￿￿” appears￿	￿ Refer to 13.1 and 6.22 selection 3.

■￿￿￿ (automatic torque boost) and ￿￿ (V/f control mode selection)

Automatic torque boost is the parameter for setting V/f control mode selection (￿￿) and auto-tuning 1 (￿￿￿￿) together. That is why all parameters related to change automatically when ￿￿￿ is changed.

		Automatically programmed parameters
￿￿￿￿		￿￿￿		￿￿￿￿￿
		Check the programmed
￿￿ Disabled (Always ￿ is displayed.)	–	value of ￿￿. (If ￿￿￿ is not		–
		changed, it becomes ￿	(V/f
		constant).)
￿￿ Automatic torque boost+auto-tuning 1	￿￿	Automatic torque boost		￿: Executed (￿ after
				execution)
￿￿ Sensorless vector control 1+auto-tuning 1	￿￿	Sensorless vector control 1		￿: Executed (￿ after
				execution)

3) Increasing torque manually (V/f constant control)

The VF-AS1 inverter is set to this control mode by factory default.

This is the setting of constant torque characteristics that are suited for such things as conveyors. It can also be used to manually increase starting torque.

To return to V/f constant control after changing the ￿￿￿ setting:

Set the V/f control mode selection parameter ￿￿=￿ (constant torque characteristic).

￿ Refer to Section 5.6.

Note:If you want to increase torque further, raise the setting value of manual torque boost ￿￿.

How to set manual torque boost parameter ￿￿ ￿ Refer to Section 5.7.

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