Non-normal Distribution Selection where the system is constantly being corrected

bobdoering

Stop X-bar/R Madness!!
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#11
Exactly - the ability to see process change is based on the resolution of the measuring instrument (GAGE R%R to %PV). Enough resolution will definitely see sawtooth...its physics. You would have to have a perfectly synced load to energy application to have it on...constantly...and not have it rise in temperature. Pretty rare, I would say.

Also, remember, ramp up and ramp down are special causes, and do not relate to the capability, only the steady state.
 
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BradM

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#12
I have a temperature controller. If I have it tuned properly, it's not going to swing; or at least not to a significant level.

Ramp up is also affected by the PID settings. The point at which the controller starts throttling back (and at what percent) also depends on the PID.

Bottom line, if your process equipment is not a nice line, including a smooth ramp up with no overshoot, the controller needs adjustment.
 
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