Function
Code
Name Setting Range Default
F3-04
V/F voltage 1 (V1)
0.0%–100.0% 0.0%
F3-05
V/F frequency 2 (F2)
V1 to rated motor frequency
0.00 Hz
F3-06
V/F voltage 2 (V2)
F1 to 100.0% 0.0%
F3-07
V/F frequency 3 (F3)
V2 to rated motor frequency 0.00 Hz
F3-08
V/F voltage 3 (V3)
F2 to 100.0% 0.0%
These six parameters are used to define the multi-speed V/F curve.
The V/F curve is usually set based on the motor’s load characteristic. Note that V1 < V2 <
V3 and F1 < F2 < F3. At low frequency, higher voltage may cause overheat or even burnt
out of the motor and over-current stall or over-current protection of the AC drive.
Figure 6-3 V/F curve setting
Function Code Parameter Name Setting Range Default
F3-09 V/F slip compensation coefficient 0%–200.0% 0.0%
This parameter is only valid for V/F control.
It can compensate the motor rotational speed slip due to load change in V/F control mode.
Generally, 100% corresponds to the rated slip when the motor drives the rated load. You
can adjust the value of this parameter based on the following principle: When the load is
rated load and F3-09 is set to 100%, the rotational speed of the motor is close to the set
speed.
Function Code Parameter Name Setting Range Default
0 Invalid
1 Valid
F3-10
Automatic voltage
regulation (AVR)
2 Valid only during deceleration
2
In V/F control mode, if quick stop is required but there is no braking resistor, set F3-10 to 2
to greatly reduce the possibility of over-voltage alarm. Set F3-10 to 1 when there is a
braking resistor or quick stop is not required.
Function Code Parameter Name Setting Range Default
F3-11 V/F oscillation suppression gain 0–100 Model dependent
Set this parameter to 0 if the motor has no oscillation. Increase the value properly only
when the motor has obvious oscillation. The larger the gain is, the better the oscillation
suppression result is obtained.
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