146
Fig. 6-20 V/F curve Fig. 6-21 Multi-stage V/F curve
P07.00=0: Customized curve, applicable to sectional constant torque load situation, refer to Fig.6-21.
In Fig.6-21: F1<F2<F3<Fb (Fb represents the basic running frequency, generally, it is the rated frequency
of the motor)
V1≤V2≤V3≤100% (V1, V2 and V3 represent the percentage of the maximum output voltage)
Table 6-4 V/F curve types
Set value Specification Features Use
17
50Hz, decrease progressively based
on square
Degressive torque
feature
These curves can be used for the loads where
the torque is proportional to the nth power of
the rotating speed, such as the fan, pump, etc.
18
50Hz, decrease progressively based
on the power of 1.7
19
50Hz, decrease progressively based
on the power of 1.2
To compensate the low-frequency torque features, certain increase compensation can be provided for the
output voltage. P07.07 is relative to the maximum output voltage. When it is set as 0, it is automatic
torque increase; when it is set as a non-zero value, it is manual torque increase, as shown in Fig.6-22.
P07.08 is used to define the percentage of the cut-off frequency for the manual torque increase relative to
the basic running frequency. Please refer to the fz in Fig.6-22. The cut-off frequency is applicable to any
V/F curve determined by P07.00.
Motor 1 torque increase cut-off point
0.0~50.0%
10.0%
P07.08
Motor 1 torque increase
0.0~30.0%
0.0%
P07.07
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