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#1 |
Member
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My friends,
If in an application we have flow control with pressure override, or pressure control with level override or something like this, how do we know that the selector should be low select or high select? Is this related to the controller action (direct or reverse)? what if one of the controller is reverse and the other one is direct? or both direct? Thanks |
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#2 |
Supporting Member
![]() ![]() Join Date: Dec 2014
Location: Tewkesbury
Posts: 695
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You're gonna have to fix your Google translate or re-phrase that question.
It makes no sense whatsoever. |
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#3 |
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#4 |
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![]() ![]() Join Date: Jan 2013
Location: UK
Posts: 809
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You use logic and common sense every time.
"If loop1 wants to drive the output lower and loop 2 wants to drive the output higher, which one would I rather do?" |
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#5 |
Lifetime Supporting Member + Moderator
![]() ![]() Join Date: Feb 2008
Location: OKC
Posts: 1,489
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Example from my world.
I want to get a certain temperature (by slowing down flow through a heat exchanger), but I want a minimum flow. Here the highest of the two determines the output. I want a certain power use on a boiler, but I don't want to exceed my temperature. Here the lowest of the two determines output. |
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#6 |
Lifetime Supporting Member
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The question makes sense, it is just too generalized to get a good response. Maybe you are looking for general answers. Maybe you have some specific hardware that we can apply the question to...
__________________
It's not all the variables I am most concerned with, it's the undiscovered constants. |
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#7 | |
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Quote:
Your example are absolutely correct. My question is how you get to the result at the last sentence of each example(lowest or highest). |
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#8 | |
Member
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Quote:
This is a general question. I don't have a specific hardware. |
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