50 VICSION VS500
fan, pump, etc. If there is some unstable phenomenon in light-load running, please switch to run in the decreasing
torque curve 1.
3: V/F user-defined curve
It is used for setting user-defined curve which user need
Voltage
[F1.4]
The max
tput voltage
Constant torque curve
Decreasing torque
curve 1
Decreasing torque
curve 2
Fig. 6-4 V/F curve
[F1.3]
f
Basic running freq
F1.1 Torque Boost(output voltage at 0 Hz)
Setting range：0.0 ~ 20.0（%）
It is used for improving the low-frequency torque character. In low-frequency running, it will make boost
compensation for the output voltage of inverter, as shown in Fig.6-5.
Boost voltage =
[F1.1]
× [F1.4]
100
[F1.4]
Voltage
Voltage
[F1.4]
[F1.1]
Boost
voltage
f
[F1.3]
（1）Decreasing torque curve
Fig.6-5 Torque boost
F1.2 Torque boost pattern
[F1.1]
Boost
voltage
f
[F1.3]
（2）Constant torque curve
Setting range：0 ，1
0：Manual
Torque boost voltage is completely controlled by F1.1. There are two features: voltage will steady boost. And motor will
easily magnetic saturation when light-load.
1：Automatic
Torque boost voltage is changed with the stator current of motor. The boost voltage is higher with the stator current
higher.
Boost voltage = [F1.1] ×[F1.4]× Inverter’s output Current
200
2×inverter’s rated current
VS500 series of general purpose inverter Duxe.ru
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