...Only because the output voltage range is limited by the supply voltage...Many op-amp based PI controllers saturate at +/-15V.
It depends on the input voltage.Why the outputs of integrator increase indefinitely
HI klausST
Could you explain windup with respect to speed controllers. Input set point is 0-10V (for speed 0-100 rpm). Feedback is through encoder. I assume that if feedback fails, PI controllers could go to +/-15V ( corresponding to 150 RPM which is beyond the rated speed of the motor). Is that what you call windup?
Hi asdf44
What would happen if my set speed is 20 RPM and due to feedback failure, speed jumps to 100 RPM. How to prevent that?
If feedback fails --> there is no (proper) feedback.A feedbacked system won´t increase infinitely.
It increases until the error becomes zero (this is why you use an integrator) and as soon as the error is zero it won´t stop increasing anymore.
Post#2 says:Can we dynamically limit or clamp the output voltage for a particular set speed?
Post#7 says:But common to both regulators is that they should be limitd to meaningful values: As soon as the output of the whole regulator is at 100% it makes no sense to increase the inegrator anymore.
You are free to write your own "dynamically" reacting software.In the digital world you have more options.
This will work in either situation.As soon as the output of the whole regulator is at 100% it makes no sense to increase the inegrator anymore.
Hi asdf44
What would happen if my set speed is 20 RPM and due to feedback failure, speed jumps to 100 RPM. How to prevent that?
what will happen if the feedback fails, and the speed jumps up to 100 RPM from 20 RPM. Can we dynamically limit or clamp the output voltage for a particular set speed?
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