Goodrive350-19 series VFD Operating
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is also recommended to adopt SVPWM control mode.
GD350-19 VFD provides multiple kinds of V/F curve modes to meet different field needs. You can
select corresponding V/F curve or set the V/F curve as needed.
Suggestions
:
1.
For the load with constant moment, for example, conveyor belt which runs in straight line, as
the moment must be constant during the whole running process, it is recommended to adopt
straight-type V/F curve.
2.
For the load with decreasing moment, for example, fan and water pump, as the relation
between its actual torque and speed is squared or cubed, it is recommended to adopt the V/F curve
corresponds to power 1.3, 1.7 or 2.0.
b
f
b
V
Output voltage
Output frequency
Straight-type
Torque -down V/F curve (1.3
th
order)
Square-type
Torque -down V/F curve (1.7
th
order)
Torque -down V/F curve (2.0
th
order)
GD350-19 VFD also provides multi-point V/F curve. You can alter the V/F curve outputted by VFD
through setting the voltage and frequency of the three points in the middle. The whole curve consists
of five points starting from (0Hz, 0V) and ending in (fundamental motor frequency, rated motor
voltage). During setup, it is required that
0≤f1≤f2≤f3≤Fundamental motor frequency, and
0≤V1≤V2≤V3≤Rated motor voltage
b
f
Output voltage
f1
f2
f3
V1
V2
V3
b
V
%
100
Output frequency
Hz
GD350-19 VFD provides dedicated function codes for SVPWM control mode. You can improve the
performance of SVPWM through settings.
1.
Torque boost
Torque boost function can effectively compensate for the low-speed torque performance during
SVPWM control. Automatic torque boost has been set by default to enable the VFD to adjust the