Parameter Description VD120 Series Inverter User Manual
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82
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F4 Motor 1 V/F Control Parameter
This function code is only effective for V/F control, is invalid for vector control.
V/F control is suitable for general load such as fan, water pump, or one inverter with more motor, or
inverter power and motor power different applications.
F4-00
V/F Curve Setting
0: Straight line V/F
1: Multipoint V/F
2: Square V/F
3: 1.2#power V/F
4: 1.4#power V/F
5: 1.6#power V/F
6: 1.8#power V/F
7: V/F complete separation mode
8: V/F half separation mode
0
◎
0: straight line V/F. Suitable for ordinary constant torque load.
1: multipoint V/F. Suitable for dewatering machine, centrifuge and other special load. At this point by
setting the F4-03~F4-08 parameters, arbitrary V/F relationship curves can be obtained.
2: Square V/F. Suitable for centrifugal load such as fans pumps.
3~6: V/F relationship curve between the straight line V/F and square V/F relationship curve.
7: V/F complete separation mode. The output frequency of frequency inverter and the output voltage
are independent of each other, output frequency be determined by the frequency source, and output
voltage be determined by F4-14 (V/F separation voltage source).
V/F complete separation mode, commonly used in these occasions such as induction heating,
inverter power supply, torque motor control.
8: V/F half separation mode.
In this case V and F is proportional, but the proportion relationship can be set through the voltage
source F4-14, and the relationship between V and F also with F1 group rated motor voltage and rated
frequency.
Assuming input voltage source for X (X is the value of 0~100%), the relationship between inverter
output voltage V and frequency F is:
V/F=2*X* (rated motor voltage) / (rated motor frequency)
F4-01
Torque Boost Mode
Selection
0: Automatic torque boost
1: Manual torque boost
0
◎
F4-02
Manual Torque Boost
0.0%~30.0%
Model
dependent
○
F4-03
Manual Torque Boost
Cutoff Frequency
0.00Hz~max frequency
50.00Hz
◎
In order to compensate for V/F control low frequency torque characteristics, do some compensation
when the low frequency inverter output voltage. But torque boost is too large, motor easy to overheat,
inverter is easy to overcurrent.
When the heavier load and motor starting torque is not enough, suggest increase this parameter. Can
reduce the torque boost when lighter load.
When the torque boost is set to 0.0, frequency inverter is automatic torque boost, the frequency
inverter according to the motor stator resistance parameters etc. automatic calculation the torque of
appreciation.
Torque increase torque cut-off frequency: under this frequency, torque boost torque effectively, more
than the set frequency, torque boost failure, see below instructions.
Summary of Contents for VD120 Series
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