Supply voltage correction

						E6581301
	Supply voltage correction		·······	Maintains a constant V/f ratio, even when the input voltage fluctuates.
	Output voltage adjustment		······	Limits the voltage at frequencies exceeding the base frequency. Note that no
				limit is imposed on the output voltage if the supply voltage is not compensated.
[Parameter setting]
	Title	Function			Adjustment range	Default setting
		Base frequency voltage				200V class:
		1			V class:~ V
		(output voltage			V class:~ V	400V class:
		adjustment)
		Base frequency voltage			:Without voltage compensation (limitless output voltage)
		selection			: With voltage compensation (limitless output voltage)
		(correction of supply			: Without voltage compensation (limited output voltage)
		voltage)			: With voltage compensation (limited output voltage)

"If is set to or , the output voltage will change in proportion to the input voltage.

"Even if the base frequency voltage () is set above the input voltage, the output voltage will not exceed the input voltage.

"The rate of voltage to frequency can be adjusted according to the rated motor capacity. For example, setting

to prevents the output voltage from increasing, even if the input voltage changes when the operation frequency exceeds the base frequency.

"When the V/f control mode selection parameter () is set to any number between ~ or ~, the supply voltage is corrected regardless of the setting of .

[=: Supply voltage uncorrected, output voltage

*The above applies when V/f control mode selection parameter is set to , or .

>1 the output voltage can be

Rated voltage prevented from exceeding the input voltage.

[=: Supply voltage corrected, output voltage

*Note that a voltage higher than is applied at output frequencies over the base frequency , even if is set below the input voltage.

[=: Supply voltage uncorrected, output voltage

*The above applies when V/f control mode selection parameter is set to , or .

[=: Supply voltage corrected, output voltage

limited]

F-26

Toshiba VF-AS1 instruction manual Supply voltage correction, Output voltage adjustment