Toshiba TOSVERT VF-AS3 - Page 308

E6582062
6. [Advanced] How to use parameters 6-66
4
4
6
9
6. 15. 6 Adjusting and limiting output voltage
<F307: Supply voltage compensation, Output voltage
limitation>
■ Function
• Supply voltage compensation: maintains a constant V/f ratio even when the input voltage
fluctuates to suppress torque reduction in the low-speed range.
• Output voltage limitation: limits the output voltage so that voltage set with <vLv: Base frequency
voltage 1> or more will not be output at frequency set with <vL: Base frequency 1> or more. This
function is used when operating a special motor with low induced voltage.
■ Parameter setting
■ Selecting a setting value
• To maintain a constant V/f ratio even when the input voltage fluctuates to suppress torque
reduction in the low-speed range, set <F307: Supply voltage compensation, Output voltage
limitation> to "1" or "3" (With supply voltage compensation).
When <F307> is set to "0" or "2", output voltage will change in proportion to the input voltage.
• The output voltage can be limited according to the motor rating. When <F307> is set to "0" or "1",
the output voltage will be limited to <vLv: Base frequency voltage 1> when operated at frequency
set with <vL: Base frequency 1> or more.
• Even if <vLv> is set to the input voltage or more, the output voltage will not exceed the input
voltage.
• When <Pt: V/f Pattern> is set to "2" - "6" or "9" - "12", With supply voltage compensation will be set
regardless of the <F307> setting.
Title Parameter name Adjustment range Default setting
F307 Supply voltage
compensation, Output
voltage limitation
0: Without supply voltage compensation,
Limited output voltage
1: With supply voltage compensation, Limited
output voltage
2: Without supply voltage compensation,
Unlimited output voltage
3: With supply voltage compensation,
Unlimited output voltage
*1
*1 Depending on the setup menu. Refer to [5. 3. 10], [11. 10].
0: W/o comp,Limited output volt
1: W/ comp,Limited output volt
0.0HzSTOP
13:19
F307 : Sup volt comp,out volt limit
2: W/o comp,Unlimited output volt
3: W/ comp,Unlimited output volt