Chapter 12 Description of Parameter SettingsC2000
12.1-01-10
In V/F, VFPG, SVC and FOC Sensorless modes
In FOCPG mode, when Pr. 01-34 is set to 2, the AC motor drive operates according to the setting.
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: 60Hz, voltage saturation in 50Hz
4: 72Hz, voltage saturation in 60Hz
5: 50Hz, decrease gradually with cube
6: 50Hz, decrease gradually with square
7: 60Hz, decrease gradually with cube
8: 60Hz, decrease gradually with square
9: 50Hz, medium starting torque
10: 50Hz, high starting torque
11: 60Hz, medium starting torque
12: 60Hz, high starting torque
13: 90Hz, voltage saturation in 60Hz
14: 120Hz, voltage saturation in 60Hz
15: 180Hz, voltage saturation in 60Hz
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 settings 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 a fan or a 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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