Converter working in different frequency can choose different speed ring PI
parameters. Operating frequency is less than the switching frequency 1 (F5.02), speed
ring PI control parameters for F5.00 and F5.01. Operating frequency is bigger than the
switching frequency 2 (F5.05), speed in PI control parameters for F5.03 and F5.04.
The speed ring PI parameters of switching frequency 1 and switching frequency 2 are
for the two groups of PI parameter linear switching, as shown in figure:
By setting speed regulator proportion coefficient and the integral time, can adjust
the speed of the vector control dynamic response characteristics.
Gain take large, quick response, but too large will produce oscillation; Gain take
hours, response lag.
I
ntegral time is too large, slow response, external interference control variation will
worse;If integral time short, reaction quickly,too small happen oscillation.
Set this value to considering the control stability and response speed, if the factory
parameters can't meet the requirements, adjust parameter based on the factory, first
increase proportion to ensure the system is not oscillation; Then reduced integration
time, make the system has faster response, small overshoot.
Note: if the PI parameters Settings unsuitable, may cause excessive speed
overshoot. Even in overshoot back occurs when overvoltage fault.
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