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Unread 08-02-2017, 01:41
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Eryl2000 Eryl2000 is offline
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Re: PID I value tuning issues

Unfortunately, Kd is also dependent the proportional gain. LabVIEW uses Kp, Ti, and Td.

However, this does not mean you need to throw PID rules of thumb out the window. Generally, I find an oscillating Kp like you did, add Td until I achieve a step response that fully dampens after 1-2 small overshoots (or less depending on the application), and then add in Ti if necessary to reduce steady-state error.

Hope this helps
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Unread 08-02-2017, 08:57
blturner blturner is offline
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Re: PID I value tuning issues

I believe that Labview has Integral windup prevention. When the I gets above a certain value it sets it back to zero.
So if you set it super high it will think it is winding up and set it to zero all the time.
Integral would typically be rather small values. I don't have enough experience to tell you what range to expect. In my previous applications it would be from .0001 to .25
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