KE300A Inverter Parameter Description
91
Group P3 V/F Control Parameters
This group of function code is enabled only for V/F control (P0-01=2) and is invalid for vector control.
V/F control is applicable for the general loads such as fan and pump or the applications where one inverter
drives multiple motors or the inverter power is one level lower or higher than the motor power.
P3-00
V/F curve setting
Factory default
0
Setting range
0
Linear V/F curve
1
Multiple-point V/F curve
2
Square V/F curve
3
1.2 power V/F
4
1.4 power V/F
6
1.6 power V/F
8
1.8 power V/F
0: Linear V/F curve. It is suitable for common constant torque load.
1: Multiple-point V/F curve. It is suitable for the special loads such as dehydrator and centrifugal machine.
2: Square V/F curve. It is suitable for the centrifugal loads such as fan and pump.
3~8: VF curve between linear VF and square VF.
P3-01
Torque boost
Factory default
Model depend
Setting range
0.0% ~ 30%
P3-02
Cut-off frequency
of torque boost
Factory default
50.00Hz
Setting range
0.00Hz ~ P0-10 (maximum frequency)
To compensate the low frequency torque characteristics of V/F control, it can boost the inverter output
voltage during low frequency. If the torque boost is set to too large, the motor may be over heat, and the
inverter may be over current.
Adjust this parameter according to the different loads. Increase this parameter for heavy load, reduce it for
light load.
When the torque boost is set to 0.0, the inverter will adopt auto torque boost.
Cut-off frequency of torque boost: Under this frequency, the torque boost is valid. If it exceeds this setting
frequency, the torque boost is invalid. Refer to Figure 6-3 for details.
