Operating Instructions

Descriptions of Parameter Settings

101 | 443

V/F Curve Selection

Pr.

Explanation

Settings

Default

01-43

V/F curve selection

0: V/F curve determined by Pr.01-00–Pr.01-08

1: V/F curve to the power of 1.5

2: V/F curve to the power of 2

Fig. 41:

● When setting to 0, see Pr.01-01–01-08 for the motor 1 V/F curve. For motor 2, see Pr.01-35–01-42.

● When setting to 1 or 2, the second and third voltage frequency settings (as shown in the V/F Curve diagram for

Pr.01-70) are invalid.

● If the load of the motor is a variable torque load (torque is in direct proportion to the rotating speed, such as the

load of a fan or a pump), the load torque is low at low rotating speed. You can decrease the input voltage

appropriately 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.

Fig. 42: