68
At this time, the output frequency of the frequency inverter and the output voltage are independent of each other.
The output frequency is determined by the frequency source, while the output voltage is determined by F3 - 13 (VF
separated voltage source).
VF complete separation mode is generally used in induction heating, frequency inverter power supply, torque
motor control and other occasions.
11: VF semi-detached mode.
V and F are proportional in this case, but the proportional relationship can be set by the voltage source F3 - 13,
and V and F are the relationship is also related to the rated voltage and frequency of F1 group motors.
Assuming that the voltage source input is X (X is a value of 0 - 100 %), the relationship between the frequency
inverter output voltage v and frequency f is: V/F = 2 * X * (rated voltage of motor) / (rated frequency of motor)
F3 - 01 torque boost
0.0 % ~ 30 % [ model determination ]
F3 - 02 torque boost cutoff frequency
0.00 Hz ~ maximum output frequency [ 50.00 Hz ]
In order to compensate for the V/F control low frequency torque characteristics, the frequency inverter output
voltage is compensated for some lift at low frequency. However, the setting of torque increase is too large, the motor
is easy to overheat, and the frequency inverter is easy to over current.
This parameter is recommended to be increased when the load is heavy and the starting torque of the motor is
insufficient. The torque lift can be reduced when the load is light.
When the torque increase is set to 0.0, the frequency inverter will automatically increase the torque. At this time,
the frequency inverter will automatically calculate the required torque increase value based on the motor stator
electrical resistance and other parameters.
Torque boost torque cutoff frequency: under this frequency, the torque boost torque is valid. If it exceeds this set
frequency, the torque boost will fail. See figure 5 - 04 for details.
Vb: manual torque lifting diagram (lifting amount is shaded part)
fz: cut-off frequency of torque lifting
Vmax: maximum output voltage
FB: basic operating frequency
Figure 5 - 04 schematic diagram of manual torque boost
(The lifting amount is the shaded part)
F3 - 03 V/F frequency value f1
0.00Hz
～
F3-05 [0.00Hz]
F3 - 04 V/F voltage v1
0.0%
～
100.0% [0.0]
F3 - 05 V/F frequency value F2
F3-03
～
F3-07 [0.00Hz]
F3 - 07 V/F frequency value F3
F3 - 05 ~ rated frequency of motor ( f1 - 04 )
[0.00Hz]
F3 - 08 V/F voltage v3
0.0%
～
100.0% [0.0]
Output frequency
Output voltage
