Space Voltage Vector Control Mode - INVT Goodrive350-19 Series Operation Manual

Goodrive350-19 series VFD for crane
Function
Name
code
current-loop
proportional
coefficient
High-frequency
current-loop
P03.38
integral
coefficient
Current-loop
high-frequency
P03.39
switching
threshold
P17.32 Flux linkage

6.5.4 Space voltage vector control mode

The VFD also carries built-in space voltage vector control function. The space voltage vector control
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 space voltage vector control mode.
The 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:

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.
The VFD also provides multi-point V/F curves. You can change the V/F curves output by the VFD by
setting the voltage and frequency of the three points in the middle. A whole curve consists of five
when the frequency is lower than the current-loop
high-frequency switching threshold (P03.39), the
current-loop PI parameters are P03.09 and P03.10; 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.
P03.37 setting range: 0–20000
P03.38 setting range: 0–20000
P03.39 setting range: 0.0–100.0% (of the max.
frequency)
0.0–200.0%
Output voltage
V
b
Straight-type
Description
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)
Square-type
Output frequency
f
b
-144-
Basic operation guidelines
Default
1000
100.0%
0.0%