Chapter 6 Description of Function Codes
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•
F2-00 and F2-01 are PI regulation parameters when the running frequency is smaller than
the value of F2-02 (Switchover frequency 1).
•
F2-03 and F2-04 are PI regulation parameters when the running frequency is larger than
the value of F2-05 (Switchover frequency 2).
•
If the running frequency is between F2-02 and F2-05, the speed loop PI parameters are
obtained from the weighted average value of the two groups of PI parameters (F2-00, F2-
01 and F2-03, F2-04), as shown in the following gure.
Figure 6-1 Relationship between running frequencies and PI parameters
Frequency
reference (Hz)
PI
parameters
F2-00
F2-01
F2-03
F2-04
F2-02
(Switchover
frequency 1)
F2-05
(Switchover
frequency 2)
The speed dynamic response characteristics in vector control can be adjusted by setting the
proportional gain and integral time of the speed regulator.
To achieve a faster system response, increase the proportional gain and reduce the integral
time. Be aware that this may lead to system oscillation.
The recommended adjustment method is as follows:
If the default setting cannot meet the requirements, make proper adjustment. Increase the
proportional gain rst to ensure that the system does not oscillate, and then reduce the integral
time to ensure that the system has quick response and small overshoot.
If both F2-02 (Switchover frequency 1) and F2-05 (Switchover frequency 2) are 0, only F2-03
and F2-04 are valid.
Improper PI parameter setting may cause too large speed overshoot and even overvoltage when
overshoot drops.
Function Code Parameter Name Setting Range Default Min. Unit
F2-06 Current loop proportional gain 10–500 120 1
F2-07 Current loop integral gain 10–500 50 1
F2-06 and F2-07 are current loop adjusting parameters in vector control. Generally, you need
not adjust these two parameters because the required control performance can be achieved
with their default values.
They are adjusted in the same way as PI parameters.
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