Chapter 12 Description of Parameter SettingsCP2000
12.1-01-11
V/F Curve Selection
Default: 0
Settings 0: V/F curve determined by Pr.01-00–01-08
1: 1.5
th
V/F curve
2: 2
nd
V/F curve
3: 60 Hz, voltage saturation in 50 Hz
4: 72 Hz, voltage saturation in 60 Hz
5: 50 Hz, decrease gradually with cube
6: 50 Hz, decrease gradually with square
7: 60 Hz, decrease gradually with cube
8: 60 Hz, decrease gradually with square
9: 60 Hz, medium starting torque
10: 60 Hz, high starting torque
11: 60 Hz, medium starting torque
12: 60 Hz, high starting torque
13: 90 Hz, voltage saturation in 60 Hz
14: 120 Hz, voltage saturation in 60 Hz
15: 180 Hz, voltage saturation in 60 Hz
When setting to 0, refer to Pr.01-01–01-08 for the motor 1 V/F curve. For motor 2, refer to
Pr.01-35–01-42.
When setting to 1 or 2, the second and third voltage frequency setting are invalid.
If the load on the motor is a variable torque load (torque is in direct proportion to rotating speed,
such as the load of fan or pump), the load torque is low at low rotating speed. Decreasing the
input voltage to make the magnetic field of the input current smaller and reduce flux loss and iron
loss for the motor to increase efficiency.
When you set the V/F curve to high power, it has lower torque at low frequency, and the drive is
not suitable for rapid acceleration and deceleration. Do NOT use this parameter for rapid
acceleration and deceleration.
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