● Decreasing torque V/F curve: Below the rated frequency, the relationship between the output voltage
and the output frequency changes according to the curves of 2 power, 1.7 power and 1.2 power. This
V/F curve is suitable for light load and the load does not change frequently. Fan, water pump load use.
Output voltage
Vb
Linear
Square
fb
Output frequency
1.2power reduce torque V/F curve
1.7power reduce torque V/F curve
2.0power reduce torque V/F curve
Figure 8-5-3 V/F Curve of Decreasing Torque
● Custom multi-point V/F curve: the frequency point setting range is 0.00Hz to the rated frequency of the
motor, the voltage point setting range is 0.0% to 100% corresponding to 0V to the motor rated voltage,
and the setting value of the multi-point V/F curve is usually based on The load characteristics of the
motor are set.
Figure 8-5-1 General constant torque linear V/F curve
Output voltage V
Output frequency F
Basic operating
frequency
Torque raises the
cut-off frequency
V lift
Vb
Output voltage V
Max output voltage
Based operation frequency
Output frequency f
V/F curve point 1
V/F curve point 2
V/F curve point 3
Figure 8-5-2 Custom multi-point V/F curve
051
NVF2G Series Inverter User's Guide
8.6 Vector control
Vector control is speed control: The speed control method is based on the stable speed as the core of the
whole control to ensure that the running speed is consistent with the set speed, and the maximum load capacity
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