Toshiba VF-A7 instruction manual Increasing starting torque/ energy-saving operation mode

▲



MON





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])

Press the [MON]key to read the first basic parameter  (Automatic acceleration/deceleration).

Switch to the parameter  (automatic control) by pressing the △ key.

When the automatic V/f mode setting  is set at (automatic torque boost + auto-tuning), the load current is observed in all speed ranges and the inverter's output voltage is adjusted automatically so that the motor can always produce torque large enough for stable operation.

Note1) The same characteristic can be obtained by setting the motor control mode selection Parameter  at (automatic torque boost) and the automatic tuning  (auto- tuning) at . => Refer to 5.10 for details.

[Setting procedure]

Key operated LED display

Set the automatic V/f mode setting  at (automatic torque boost + auto-tuning).

Note) The parameter always returns to  after completion of the setting. To check the setting (set value), check the  previous monitor in monitor mode. (Refer to 8.1 for details.)

5.2 Increasing starting torque/ energy-saving operation mode

 ：Automatic V/f mode setting

･Function

This parameter enables the inverter to automatically switch V/f control modes and set the motor constant (online automatic control) at the same time to make the motor produce larger torque. With this parameter, two control modes can be set at a time, for example, special V/f control modes, including the automatic torque boost mode and the vector control mode.

･Constant torque characteristic (Default setting)

･Automatic torque boost + auto-tuning

･Vector control (speed control) + auto-tuning

･Automatic energy-saving + auto-tuning

Note) With the motor control selection parameter , you can set the square reduction torque, the sensor vector control (optional), etc.

=> Refer to 5.10 for details.

Title	Function	Adjustment range	Default setting
		: ―( is always displayed.)
	Automatic V/f	: Automatic torque boost + auto-tuning	
	mode setting	: Sensorless vector control (speed) + auto-tuning
		: Automatic energy-saving + auto-tuning

1)To automatically increase the torque according to the load condition

ENT		Press the Enter key to display the parameter setting (set value).
▲		Change the parameter setting to (automatic torque boost +
		auto-tuning) by pressing the △ key.
ENT	⇔	Press the Enter key to save the change. Then,  and the
		set value are displayed alternately.

Note 2) Setting  at  causes  to be set at  automatically.

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