Svpwm Control - INVT Goodrive 310-UL Series Operation Manual

GD310-UL series VFD

7.4 SVPWM control

The 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.
The VFDs provide multiple V/F curve modes. The user can select the corresponding V/F curve
according to the site needs. Or they can set the corresponding V/F curve based on their own needs.
Recommendations:
For the load of constant torque, such as the conveyor belt which runs linearly, it is proper 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 proper 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.
V
b
Goodrive310-UL 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 consists 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
0≤V ≤V ≤V ≤the rated voltage of the motor.
1 2 3
Goodrive310-UL series VFDs provide special function code for SVPWM control mode which can
improve the performance of SVPWM control by means of setting.
Output voltage
Linear type
Square type
Output voltage
100.0%
V3
V2
V1
Torque-down V/F curve (power of 1.3)
Torque-down V/F curve (power of 1.7)
Torque-down V/F curve (power of 2.0)
Output frequency
f
b
≤f ≤f
1 2
f1 f2 f3
-122-
Basic operation instruction
≤the basic frequency of the motor;
3
Output
frequency