Goodrive300 Series VFD Basic operation instruction
133
Detailed instruction of parameters
7.4 SVPWM control
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.
Output voltage
Output frequency
Linear type
Square type
Torque-stepdown characteristics V/F curve (1.3 order)
Torque-stepdown characteristics V/F curve (1.7 order)
Torque-stepdown characteristics V/F curve (2.0 order)
V
b
f
b
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≤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.
Output voltage
Output frequency
V1
V2
V3
f1 f2 f3
100% V
b
f
b
Goodrive300 series VFDs provide special function code for SVPWM control mode which can improve
the performance of SVPWM control by means of setting.
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