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What is a Blind Controller?

11/18/2014 12:38 AM

Hi to all. I have a querry.

What is a blind controller?

A reply would be appreciated.

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#1

Re: What is a blind controller?

11/18/2014 1:00 AM

Controller with no PV display.

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#2
In reply to #1

Re: What is a blind controller?

11/18/2014 1:44 AM

Thank you for your valuable reply.

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#3

Re: What is a blind controller?

11/18/2014 2:45 AM

A controler that controls the blinds in an office or house.

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#4

Re: What is a blind controller?

11/18/2014 5:00 AM

This is probably a matter of local terminology. Quite likely it is a controller without feedback. A simple example would be a potentiometer. A more complex example would be sensorless vector control.

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#5

Re: What is a blind controller?

11/18/2014 9:22 AM

Stevie Wonder on the keyboards.

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#7
In reply to #5

Re: What is a blind controller?

11/18/2014 10:13 AM
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#6

Re: What is a Blind Controller?

11/18/2014 9:38 AM

(add funny caption here)

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#19
In reply to #6

Re: What is a Blind Controller?

11/19/2014 9:09 AM

She belongs on a 'Caption This' Friday thread.

She DOESN'T belong on the road I'm trying to use for my daily commute, even though I saw her (or maybe her sister) today as she cut me off at the toll plaza.

"HEY LADY! The 'manual' section has a few I-Pass stations on the lases closes to the 'Open Road Tolling,' and the manual lanes have I-Pass sensors as well. Is it REALLY worth trying to end MY life so you can get to the upcoming knot in traffic a few seconds earlier?"

(Self marking as OT for road rage.)

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#26
In reply to #6

Re: What is a Blind Controller?

01/28/2015 9:08 AM

She just cut me off on the freeway exit this morning!

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#8

Re: What is a Blind Controller?

11/18/2014 2:04 PM

From a controls theory perspective a blind controller can be considered as the input device of an open loop system. Since the OP provides no perspective other than the baffling Instrumentation blog heading, then Stevie Wonder, Dhritarashta, and Louis the Blind can also be plausible answers.

OP, please explain the context of your question.

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#9

Re: What is a Blind Controller?

11/18/2014 10:35 PM

The guy in Thomas the Tank engine who replaced the other guy who ate more food than he should have.

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#10

Re: What is a Blind Controller?

11/18/2014 11:10 PM
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#11

Re: What is a Blind Controller?

11/19/2014 2:14 AM

i was going say a labrador with a special harness, but you can readily get a proper answer if you google "blind controller definition".

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#12

Re: What is a Blind Controller?

11/19/2014 2:14 AM
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#13

Re: What is a Blind Controller?

11/19/2014 6:35 AM

Try googling blind controller. blind controller system definition of blind controller system in ... encyclopedia2.thefreedictionary.com/blind+controller+system A process control arrangement that separates the in-plant measuring points (for example, pressure, temperature, and flow rate) and control points (for example, ...

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#14

Re: What is a Blind Controller?

11/19/2014 7:39 AM

Here is you answer.

http://lmgtfy.com/?q=Blind+controller+definition

Glad to help

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#15
In reply to #14

Re: What is a Blind Controller?

11/19/2014 8:04 AM

Google's first answer looks intriguing, but it would be nice if someone here could expound further. From the McGraw-Hill Dictionary of Scientific & Technical Terms,

"A process control arrangement that separates the in-plant measuring points (for example, pressure, temperature, and flow rate) and control points (for example, a valve actuator) from the recorder or indicator at the central control panel."

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#16
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Re: What is a Blind Controller?

11/19/2014 8:31 AM

I'll give it a shot..

A controller normally operates within a feedback or feed-forward loop, which means that each of the measured variables has a desired set-point (value) to be controlled at.

When controlling 'blindly' per the definition you gave, the measured variables' values are displayed at the control panel, but are ignored by the controller (controller is 'blind' to them)

eg. water at a cooling tower is drained/ controlled 'blindly' by having a valve continuously wide-open, without taking the temperature at the cooling tower into consideration, although it is the actual desired temperature set-point which would normally determine the % opening/closing of the valve. All the while the actual temperature is displayed at the control panel, so the Operator can intervene manually if need be (perhaps the cooling pond below the tower may overflow)

If my fictitious example actually exists somewhere, the hole designer probably didn't bother to size the valve properly either, and that is why.

I just rattled that off, but I hope it's self-expalnatory.

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#20
In reply to #16

Re: What is a Blind Controller?

11/19/2014 9:21 AM

Sounds like a control theory definition. (Where have I heard that before.)

You left out any references to a monarch.

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#25
In reply to #20

Re: What is a Blind Controller?

11/20/2014 1:52 AM

Nope, made it up on the spur of the moment...never actually seen a 'blind controller' in 35 years. Monarch ?? Why would I bring Elvis into this....?

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#21
In reply to #15

Re: What is a Blind Controller?

11/19/2014 6:57 PM

I'm still salivating over all that awesome gear you've got on that bench behind you.

What were you saying about 'blind controllers' again please?

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#17

Re: What is a Blind Controller?

11/19/2014 8:49 AM

There are two kind of Blind controllers. In the picture you will see on the right, the twisty rod type.

On the left you will see the string thingy type.

Both are essential for correct function of the blinds.

You're Welcome.

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#18
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Re: What is a Blind Controller?

11/19/2014 8:52 AM

You must have seen the controllers through a closed blind...neat trick!

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#22
In reply to #18

Re: What is a Blind Controller?

11/19/2014 7:02 PM

Oh god, not another blind-controller voyeur.

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#23

Re: What is a Blind Controller?

11/19/2014 9:35 PM

My BOSS

sorry... I couldn't resist.

Bill

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#24

Re: What is a Blind Controller?

11/19/2014 11:57 PM

The controller up in the control tower that instructs blind airplane pilots on their take offs and landings. Or is the blind controller in the control tower instructing pilots? No, its the controller who is guiding pilots on landings when the plane is using an ILS for "blinding fog" landings!

Good Luck, Old Salt

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#27

Re: What is a Blind Controller?

03/31/2017 2:10 AM

I have worked on control systems both hardware and software for over fifty years.

In my opinion a blind controller is one that does not display the controlled variable on its face, so you cannot tell if it is working by looking at it. Johnson Controls Ltd. was famous for making blind controllers that worked. Usually the controlled variable was displayed elsewhere in the same cabinet but that was an option. A computer control system could also be blind if the local remote panel had no indicators on it. You would have to go to the central system to see what was going on. You could also likely log into the system at the panel to see what is going on.

Contrast a deaf dumb blind and stupid controller which has no idea what is going on and could be a block of wood. Blind controllers are cheap and they work. They have to be serviced by qualified staff who know how to handle them.

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#28
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Re: What is a Blind Controller?

03/31/2017 8:21 AM

"Blind controllers are cheap and they work."

That's why the bean-counters love insisting on them over controllers with a good HMI built in.

"They have to be serviced by qualified staff who know how to handle them."

Those personnel are expensive, good luck finding any in the same buildings as the blind controllers are installed in.

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#29

Re: What is a Blind Controller?

11/22/2022 3:21 AM

It depends upon context. It isn't possible to convey context in a sentence of 5 words: <...What is a blind controller?...>. Please elaborate.

A reply would be appreciated.

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#30

Re: What is a Blind Controller?

11/22/2022 4:14 AM

It's the guy generally at the start of a processing line that just starts and stops the infeed raw material...at each proceeding step there is a local controller that just maintains his assigned process and must signal the main controller if an emergency shutdown is required...these are generally semi-automation operations where the local controllers are just monitoring the process at their station...

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#31

Re: What is a Blind Controller?

12/10/2022 7:35 AM

jdbailes is correct. A blind controller does not have a display for the process variable and the control output. There's just a dial for the setpoint. The last time I saw one was back in the 1980's. It dropped out of popularity because you can't see how it's performing. You have to have "blind" confidence that it's doing its job properly.

regards,

Vulcan

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