Toshiba VF-FS1 instruction manual Increasing starting torque, Motor constant must be set

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3) Increasing starting torque

Setting of V/F control mode selection RV to  (automatic torque boost control)

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
						voltage(%)Output
					XNX
				:Automatically
			H
				adjusts the		0
				amountof torque
				boost.			Base frequency		Output frequency (Hz)
								XN
		Note: This control system can oscillate and destabilize runs depending on the load. If that should
			happen, set V/F control mode selection RV to  (V/F constant) and increase torque manually.
5
	+	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. In any other case, be sure to set the parameters H to H properly.

Be sure to set H (rated current of motor) and H (rated speed of motor) correctly, as specified on the motor’s nameplate. For the setting of H (no-load current of motor), refer to the motor test report. There are two procedures for setting the other motor constants.

1)The motor constant can be automatically set (auto-tuning). Set the extended parameter H to .

⇒For details, see selection 1 in 6.15.1.

2) Each motor constant can be set individually. ⇒ For details, see selection 2 in 6.15.1.

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

Setting of V/F control mode selection RV to  (Vector control)

Using sensor-less vector control with a Toshiba standard motor will provide the highest torque at the low speed ranges.

(1)Provides large starting torque.

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

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

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