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7.4 SVPWM control
Goodrive200 series inverters provide internal SVPWM control which can be used in cases where it
does not need high control accuracy. It is also recommended to use SVPWM control when one
inverter drives multiple motors.
Goodrive200 series inverters provide multiple V/F curve modes. The user can select the
corresponding V/F curve to the site needs. Or they can set the corresponding V/F curve to 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 2nd power of V/F curve because the actual torque is 2-squared or
3-squared of the rotating speed.
Goodrive200 series inverters 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 consisted 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≤f
1
≤f
2
≤f
3
≤the basic frequency of the
motor; 0≤V
1
≤V
2
≤V
3
≤the rated voltage of the motor.
Goodrive200 series inverters 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
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