Re: PD(PI) Math Model (e.g.Tank Level) Still in need of CORRECTION!


<pnachtwey@xxxxxxxxx> schrieb im Newsbeitrag
news:1179817791.491567.194900@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On May 21, 11:43 pm, Tim Wescott <t...@xxxxxxxxxxxxxxxx> wrote:
On Mon, 21 May 2007 17:49:15 -0700, Peter Nachtwey wrote:
JCH, are you listening?

This is another example of the nonsense that people think they can get
away with when they combine the plant and controller transfer functions
and convert the response directly to the time domain. There is no
0-100%
limit on the controller so the closed loop transfer function will be
happy allowing valves to pump fluid level up and heaters to cool a
temperature control system.

Peter Nachtwey

I'd like to get my hands on some of those heaters -- particularly with
summer coming on.

If he hasn't listened by now, I'm not sure that he ever will.

I just don't want anyone to think that what JCH is doing the right
way.
How about your class? What are you going to teach them? The last
thing the world needs is more people thinking their heater systems can
cool and gains can be infinite.


When or where did I say heater systems can cool? I never said that.

Can you understand the meaning of:
If gain k goes to infinity then x will be u (x=u).

What I stated in Fig. 2:
http://home.arcor.de/janch/janch/_control/20070514-controldoc/

That's polemic. Keep honest.

--
Regards/Grüße http://home.arcor.de/janch/janch/menue.htm
Jan C. Hoffmann eMail aktuell: janch@xxxxxxxxxxxxxxxxxxx
Microsoft-kompatibel/optimiert für IE7+OE7



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