INVT Goodrive35 Series Operation Manual page 151

Goodrive35 Series Closed-loop Vector Control VFD
Suggestions:
1. 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.
2. 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
Goodrive35 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 consisted of 5 dots. The
starting dot is (0 Hz, 0 V), and the ending dot is (the basic frequency of the motor, the rated voltage
of the motor). During the setting processing: 0≤f
V ≤the rated voltage of the motor.
3
Goodrive35 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 effectively compensate for the performance of low speed torque during
SVPWM control. Automatic torque boost has been set by default to enable the VFD to adjust the
torque boost value based on the actual load conditions.
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 to the motor. If such
situation occurs, lower the torque boost value..
Linear type
Square type
100.0%
V3
V2
V1
Torque step-down V/F curve (1.3 order)
Torque step-down V/F curve (1.7 order)
Torque step-down V/F curve (2.0 order)
Output frequency
≤f ≤f ≤the basic frequency of the motor; 0≤ V
1 2 3
Output voltage
f1 f2 f3
144
Basic operation instruction
Output
frequency
(Hz)
≤ V ≤
1 2