Chapter 12 Description of Parameter Settings
MH300
Default: 0
Settings
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
16: V/F Separated mode (VFSM)
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.
For V/F absolutely separation, the rated voltage of Pr.01-02 corresponds to 100%, and for half
separation, the original FV conversion slope corresponds to 100%.
Auto-Acceleration / Auto-Deceleration Setting
Default: 0
Settings
0: Linear acceleration and linear 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 linear 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 reduces the mechanical
vibration and prevents the complicated auto-tuning processes. It does not stall during acceleration
and has no need for a brake resistor. It can also improve operation efficiency and save energy.
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