158
Fig. 6-25 V/F curve Fig. 6-26 Multi-stage V/F curve
P07.00=0: Customized curve, applicable to sectional constant torque load situation, refer to Fig.6-26.
In Fig.6-26: 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)
The 19 pre-set V/F curves are as shown in the following table, which are enabled only under the V/F
control mode.
Table 6-4 V/F curve types
Set value Specification Features Use
1
50Hz
Constant torque
feature
The curves are applicable to general use, such
as the straight-line motion for moving devices.
They can be used where the load torque is
unchanged no matter how the rotating speed
is.
2
60Hz
3
60Hz, voltage saturation @ 50Hz
4
Reserved
5
50Hz, decrease progressively based
on cube
Degressive torque
feature
These curves can be used for the loads where
the torque is proportional to the square or cube
of the rotating speed, such as the fan, pump,
etc.
6
50Hz, decrease progressively based
on square
7
60Hz, decrease progressively based
on cube
8
60Hz, decrease progressively based
on square
9
50Hz, medium startup torque
High startup
torque
The V/F curves for the high startup torque can
be used under the following conditions: the
cables of the drive and the motor are very long
(more than 150m); large torque is needed
upon startup (such as lifter); AC reactor is
connected to the output of the drive.
10
50Hz, large startup torque
11
60Hz, medium startup torque
12
60Hz, large startup torque
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