E6581611
F-71
6
6.19.6 Output voltage adjustment/Supply voltage correction
vlv : Base frequency voltage 1
f307 : Supply voltage correction (output voltage limitation)
Function
Supply voltage correction: Prevent torque decline during low-speed operation.
Maintains a constant V/F ratio, even when the input voltage fluctuates.
Output voltage limitation: Limits the voltage at frequencies exceeding the base frequency (vl) to
prevent outputting the voltage exceeding base frequency voltage (vlv).
Applied when operating a special motor with low induced voltage.
[Parameter setting]
Title Function Ad
ustment ran
e Default settin
vlv Base frequency voltage1
50-330 (240V class)
50-660 (500V class)
*1
f307
Supply voltage correction
(output voltage limitation)
0: Supply voltage uncorrected,
output voltage limited
*1
1: Supply voltage corrected,
output voltage limited
2: Supply voltage uncorrected,
output voltage unlimited
3: Supply voltage corrected,
output voltage unlimited
*1: Default setting values vary depending on the setup menu setting. Refer to section 11.5.
● If f307 is set to "0" or "2", the output voltage will change in proportion to the input voltage.
● Even if the base frequency voltage (vlv parameter ) is set above the input voltage, the output voltage
will not exceed the input voltage.
● The ratio of voltage to frequency can be adjusted according to the rated motor voltage and frequency.
Setting f307 to "0" or "1" prevents the output voltage from increasing, even if the input voltage
changes when operation frequency exceeds the base frequency.
● When the V/F control mode selection parameter () is set to any number between 2 to 6, the supply
voltage is corrected regardless of the setting of f307.
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