Goodrive350 IP55 High-ingress Protection Series VFD
Basic Operation Instructions
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5.5.4 SVPWM control mode
The VFD also carries built-in SVPWM control function. SVPWM mode can be used in cases
where mediocre control precision is enough. In cases where a VFD needs to drive multiple
motors, it is also recommended to adopt SVPWM control mode.
The VFD provides multiple kinds of V/F curve modes to meet different field needs. Users can
select corresponding V/F curve or set the V/F curve as needed.
Suggestions:
1. For the load featuring constant moment, eg, conveyor belt which runs in straight line, as the
moment should be constant during the whole running process, it is recommended to adopt
straight-type V/F curve.
2. For the load featuring decreasing moment, eg, 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 (power of 1.3)
Square-type
Torque -down V/F curve (power of 1.7)
Torque -down V/F curve (power of 2.0)
The VFD also provides multi-point V/F curve. Users 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
Output frequency
Hz
b
V
%
100
The VFD provides dedicated function codes for SVPWM control mode. Users 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 torque boost value based on actual load conditions.
Содержание GD350-004G/5R5P-45-AS
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