MD380 User Manual Desc
ription of Function Codes
- 157 -
Group F3: V/F Control Parameters
Group F3 is valid only for V/F control.
The V/F control mode is applicable to low load applications (fan or pump) or applications
where one AC drive operates multiple motors or there is a large difference between the AC
drive power and the motor power.
Function Code Parameter Name Setting Range Default
F3-00 V/F curve setting
0: Linear V/F
1: Multi-point V/F
2: Square V/F
3: 1.2-power V/F
4: 1.4-power V/F
6: 1.6-power V/F
8: 1.8-power V/F
9: Reserved
10: V/F complete separation
11: V/F half separation
0
0: Linear V/F
It is applicable to common constant torque load.
1: Multi-point V/F
It is applicable to special load such as dehydrator and centrifuge. Any such V/F curve
can be obtained by setting parameters of F3-03 to F3-08.
2: Square V/F
It is applicable to centrifugal loads such as fan and pump.
3 to 8: V/F curve between linear V/F and square V/F
10: V/F complete separation
In this mode, the output frequency and output voltage of the AC drive are independent.
The output frequency is determined by the frequency source, and the output voltage is
determined by "Voltage source for V/F separation" (F3-13).
It is applicable to induction heating, inverse power supply and torque motor control.
11: V/F half separation
In this mode, V and F are proportional and the proportional relationship can be set in
F3-13. The relationship between V and F are also related to the rated motor voltage
and rated motor frequency in Group F1.
Assume that the voltage source input is X (0 to 100%), the relationship between V and
F is:
9) [;[5DWHGPRWRUYROWDJH5DWHGPRWRUIUHTXHQF\
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