I hope it is not being suggesting that is an optimal PI (no D) oven
controller for limiting overshoot.
Many other ways to do it with less overshoot IF that was needed or wanted.
From the test I've done on it, Less overshoot is not necessary and likely
not desired.
It overshoots a little but does not ring which is near the optimal tuning
for a simple basic PI controller.
And of course today there is always the choice to rise the resistor values
and use a better amp which has the same effect as rising the cap's value.
ws
****************************
Rick Karlquist richard at karlquist.com wrote:
ws at Yahoo wrote:
As already stated, there are many different ways to design
and or tune a temperature controller so it does not overshoot.
The 10811 control loop is constrained by the large oven mass
and the limited size of the integrator capacitor. The
capacitor is barely large enough in capacitance to prevent
loop oscillation but on the other hand is barely small
enough to physically fit in the available space. Unfortunately, no
advances in capacitor size have occurred in the last 30
years, so we are still stuck with the original design.
BTW, you cannot use a metallized mylar capacitor in an
integrator, you must use a foil and mylar type. This is
due to the "healing" process that metallized mylar
capacitors undergo.
Rick Karlquist
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