GD350A series high-performance multifunction VFD
-63-
Function
code
Name
Description
Default
coefficient
and when the frequency is higher than the current-
loop high-frequency switching threshold (P03.39), the
current-loop PI parameters are P03.37 and P03.38.
Setting range of P03.37: 0–20000
Setting range of P03.38: 0–20000
Setting range of P03.39: 0.0–100.0% (of the maximum
frequency)
High-
frequency
current-loop
integral
coefficient
1000
Current-loop
high-
frequency
switching
threshold
100.0%
Flux linkage 0.0–200.0%
0.0%
5.5.4 Space voltage vector control mode
The VFD also provides the space voltage control function. The space voltage control mode can be
used in cases where mediocre control precision is enough and in cases where the VFD needs to drive
multiple motors.
The VFD provides multiple V/F curve modes to meet different requirements. You can select V/F curves
or set V/F curves as required.
Suggestions:
For the load featuring constant moment, such as conveyor belt which runs in straight line, as the
whole running process requires constant moment, it is recommended to adopt the straight line
V/F curve.
For the load featuring decreasing moment, such as fan and water pumps, as there is a power
(square or cube) relation between its actual torque and speed, it is recommended to adopt the
V/F curve corresponding to the power of 1.3, 1.7 or 2.0.
