Toshiba VF-A7 instruction manual If you fail to make the setting for vector control

2)The vector control (Increasing the starting torque and operating with a higher accuracy) Set the automatic V/f mode setting  at (vector control (speed) and auto-tuning).

By setting the automatic V/f mode setting  at (vector control (speed control) and auto- tuning), the motor reach its full potential and produce large torque even at low speeds. Also, you can minimize motor speed fluctuations caused by load fluctuations for more accurate operation. This mode of control is best suited to conveyor and crane/hoist application as operated in speed control mode.

[Setting procedure]

Key operated	LED display	Operation
		The running frequency is displayed. (Make this setting when the
		motor is out of operation.)(If the monitor display selection
		parameter  is set at [Running frequency])
MON		Press the [MON] key to call up the first basic
		parameter (automatic acceleration/deceleration).
▲		Switch to the parameter (Automatic V/f mode setting)
		by pressing the △ key.
ENT		Press the Enter key to display the parameter setting (set
		value).
▲		Change the parameter setting to 2 (sensor-less vector
		control and auto-tuning) by pressing the △ key.
ENT	⇔	Press the Enter key to save the change. Then,  and
		the set value are displayed alternately.

Note 1) The same characteristic can be obtained by setting the motor control mode selection parameter at (vector control) and the auto-tuning parameter  at . Refer to 5.10 for details.

2)Setting  at  causes to be set at  automatically.

3)To operate the inverter in energy-saving mode

Set the automatic V/f mode setting  at (automatic energy-saving + auto tuning).

When the automatic V/f mode setting  is set at , the inverter passes a current commensurate with the load to save energy.

[Setting procedure]

Key operated	LED display	Operation
		The running frequency is displayed. (Make this setting when the
		motor is out of operation.)(If the monitor display mode setting
		parameter  is set at [Running frequency])
MON		Press the [MON] key to call up the first basic parameter 
		(Automatic acceleration/deceleration).
▲		Switch to the parameter (Automatic V/f mode setting)
		by pressing the △ key.
ENT		Press the Enter key to display the parameter setting (set
		value). (The value is always .)
▲		Change the parameter setting to  (automatic energy-saving
		and auto-tuning) by pressing the △ key.
ENT	⇔	Press the Enter key to save the change. Then,  and the
		parameter set value  are displayed alternately.

If you fail to make the setting for vector control ...,

First, read the notes on vector control in 9) of section 5.10)

1) If the expected torque cannot be obtained => Selection 3 in 6.20

2) If the auto-tuning error message  is displayed => Selection 3 in 6.20

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