(a) With the aid of a sketch explain how proportional action is produced
in a pneumatic controller whose output is 0.2 to 1.0 bar. Assume that
the controller is direct acting.
(b) Show, mathematically, that the output is dependent on the difference
between the measured and desired values.
(c) With the aid of a well annotated sketch describe the construction and
operation of a P + I + D controller having a pneumatic output.
none that I can think of
The Attempt at a Solution
(a) I believe I have to produce this as the first part of the question. As my lessons are pretty poor this is all I can gather from the content.
(b) There is nothing that I can see in my notes for this. The tutor is as helpful as the notes also.
(c) I think this is what they are after, but again my lessons don't shed much light on this.
I just need pointed in the right direction and I should be good to be honest.
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