Toshiba VF-S9 manual Increasing starting torque, Motor constant must be set

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3) Increasing starting torque

			Setting V/F control selection	to	(automatic torque boost)
		Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
		This gives steady torque for stable runs.
			Base frequency voltage
			Output voltage (%)
			Automatically
			adjusts the amount
			of torque boost.				Base frequency	Output frequency (Hz)
			Note: This control system can oscillate and destabilize runs depending on the load. If that should
			happen, set V/F control mode selection				to (V/F constant) and increase torque manually.
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	★	Motor constant must be set
		If the motor you are using is a 4P Toshiba standard motor and if it has the same capacity as the inverter,
		there is basically no need to set the motor constant.
		There are two procedures for setting the motor constant.
		1)	The motor constant can be set automatically (auto-tuning). Program the extended parameter
			to .			⇒	For details, see selection 2 in 6.13.
		2)	Each motor constant can be set individually.			⇒	For details, see selection 3 in 6.13.

4)Sensorless vector control--increasing starting torque and achieving high-precision operation.

Setting of V/F control mode selection to (Sensorless vector control)

Using sensorless vector control with a Toshiba standard motor will provide the highest torque at the lowest speed ranges. The effects obtained through the use of sensorless vector control are described below.

(1)Provides large starting torque.

(2)Effective when stable operation is required to move smoothly up from the lowest speeds.

(3)Effective in elimination of load fluctuations caused by motor slippage.

★Motor constant must be set

If the motor you are using is a 4P Toshiba standard motor and if it has the same capacity as the inverter, there is basically no need to set the motor constant.

There are three procedures for setting motor constants.

1)	The sensorless vector control and motor constants (auto-tuning) can be set at a time.
	Set the basic parameter	to .		⇒	For details, see 1 in 5.2.
2)	The motor constant can be automatically set (auto-tuning).
	Set the extended parameter		to .	⇒	For details, see selection 2 in 6.13.

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