Space Voltage Vector Control Mode - INVT Goodrive270 Series Operation Manual

Goodrive270 series VFD for fan and pump
Function
Name
code
Speed-loop
P03.36
differential gain
High-frequency
current-loop
P03.37
proportional
coefficient
High-frequency
current-loop
P03.38
integral
coefficient
Current-loop
high-frequency
P03.39
switching
threshold
P17.32 Flux linkage

5.5.4 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.
1: Reserved
Hundreds place: indicates whether to enable
speed-loop integral separation
0: Disable
1: Enable
Thousands place: Reserved
0: Reserved
1: Reserved
0.00–10.00s
In the vector control mode (P00.00=3), 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, the current-loop PI
parameters are P03.37 and P03.38.
P03.37 setting range: 0–65535
P03.38 setting range: 0–65535
P03.39 setting range: 0.0–100.0% (of the max.
frequency)
0.0–200.0%
-73-
Description
Basic operation guidelines
Default
0.00s
1000
1000
100.0%
0.0%