Goodrive300 series VFDs provide internal SVPWM control which can be used in the cases where it does not need high control accuracy. It is also recommended to use SVPWM control when one VFD drives multiple motors.

Goodrive300 series VFDs provide multiple V/F curve modes. The user can select the corresponding V/F curve according to the site needs or their own needs.

Recommendations:

For the load of constant torque, such as the conveyor belt which runs linearly. It is properly to select linear V/F curve because it needs constant torque.

For the load of decreasing torque, such as fans and water pumps, it is properly to select corresponding 1.3th, 1.7th or 2th power of V/F curve because the actual torque is 2-squared or 3-squared of the rotating speed.

Goodrive300 series VFDs provide multi-dots V/F curve, the user can change the output V/F curve by setting the voltage and frequency of three middle dots. The whole curve is comsisted of 5 dots. The starting dot is (0Hz, 0V), and the ending dot is (the basic frequency of the motor, the rated voltage of the motor). During the setting processing: 0≤f₁≤f₂≤f₃≤the basic frequency of the motor; 0≤V₁≤V₂≤V₃≤the rated voltage of the motor.

Goodrive300 series VFDs provide special function code for SVPWM control mode which can improve the performance of SVPWM control by means of setting.

1.Torque boost

Torque boost function can compensate the performance of low speed torque during SVPWM control. The VFD will adjust the torque boost according to the actual load.

Note:

The torque boost takes effect only when the frequency is under the cap frequency of the boost.

If the torque boost is too big, low frequency vibration or overcurrent fault may occur. Please lower the torque boost.

2. Energy-saving running

In the actual operation, the VFD can search by itself to achieve a better effect point. The VFD can work with high effect to save energy.

Note:

This function is usually used in the cases where the load is light or empty.

If the load transients frequently, this function is not appropriate to be slected.

3. V/F slips compensation gain

SVPWM control belongs to the open loop mode. If the load of the motor transients suddenly, the fluctuation of the rotation speed may occur. In the cases where the high accuracy speed is needed, slip compensation gain (internal output adjustment) can be set to compensate the speed change caused by load fluctuation.

Setting range of slip compensation gain: 0–200%, of which 100% corresponds to the rated slip frequency.

Note:Rated slip frequency= (rated synchronous rotation speed of the motor-rated rotation speed of the motor) × number of pole pairs/60.

4. Vibration control

Motor vibration occurs frequently when applying SVPWM control mode in the cases where high power is needed. In order to settle this problem, Goodrive300 series VFDs add two function codes which are set to control the vibration factors. The user can set the corresponding function code according to the vibration frequency.

Note: Bigger the set value, more effective the control. If the set value is too big, overcurrent may occur to the motor.

5. User-defined V/F curve (V/F seperation) function

When the user selects the user-defined V/F curve function in Goodrive300 series VFDs, they can set the given channel of voltage and frequency and the corresponding ACC/DEC time, or the two can combinate to form a real-time curve.

Note: the application of V/F curve separation can be used in many cases with various kinds of power supply of the VFD. But the users should set and adjust the parameters with caution. Incorrect parameters may cause damage to the VFD.