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Description of Function Codes
Group P3: V/F Control Parameters
Group P3 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
P3-00
V/F curve setting
•
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 P3-03 to P3-08.
•
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" (P3-13).
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
P3-13. The relationship between V and F are also related to the rated motor voltage
and rated motor frequency in Group P1.
Assume that the voltage source input is X (0 to 100%), the relationship between V and
F is:
V/F = 2 x X x (Rated motor voltage)/(Rated motor frequency)
Parameter Name
Setting Range
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
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I5300 User Manual
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