Chapter 12 Descriptions of Parameter SettingsMS300
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0: V/F curve determined by Pr.01-00–01-08
1: V/F curve to the power of 1.5
2: V/F curve to the power of 2
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 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.
Auto-Acceleration and Auto-Deceleration Setting
0: Linear acceleration and deceleration
1: Auto-acceleration and linear deceleration
2: Linear acceleration and auto-deceleration
3: Auto-acceleration and auto-deceleration
4: Stall prevention by auto-acceleration and auto-deceleration
(limited by Pr.01-12–01-21)
0 (linear acceleration and deceleration): the drive accelerates and decelerates according to the
setting for Pr.01-12–01-19.
1 or 2 (auto/linear acceleration and auto/linear deceleration): the drive auto-tunes the
acceleration and deceleration to effectively reduce the mechanical vibration during the load start-
up and stop and make the auto-tuning process easier. It does not stall during acceleration and
does not need a brake resistor during deceleration to stop. It can also improve operation
efficiency and save energy.
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