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-   -   Unwinding wound up Auber (http://www.homebrewtalk.com/f235/unwinding-wound-up-auber-333576/)

MalFet 06-06-2012 01:25 PM

Unwinding wound up Auber
 
Hello everyone,

Is there an easy and surefire way to reset the integral wind-up on an Auber 2362? I've got a switch between my SSR and my element, and of course anytime I've got the thing off for more than a moment the PID winds up and overshoots when I turn it back on.

I'm looking for the easiest way to reset the accumulated windup before I turn element back on, but I haven't been able to find a definitive answer on what will do it. Things I've heard mentioned include (in order of "easiness"):

1) Change the SV
2) Unplug the probe
3) Switch to manual mode and back
4) Power cycle the whole system

Anyone know which of these will and which of these won't do the job?

-MalFet

carlisle_bob 06-06-2012 04:58 PM

Hi

Ummm, errrr ...

Why switch off the element?

Bob

Rbeckett 06-06-2012 05:05 PM

Help me out here, please. Can you explain what exactly wind up is and what causes and negates it? I am still an electronics noob and have seen a couple of mentions of wind up but dont understand the concept from a practical stand point. Any light you could shed would be great!!! I am always increasing my knowledge and havent learned this yet. Thanks!!!!
Wheelchair Bob

MalFet 06-06-2012 05:11 PM

Quote:

Originally Posted by carlisle_bob (Post 4148874)
Hi

Ummm, errrr ...

Why switch off the element?

Bob

To stop applying heat to the system, mostly ;)

This is for a RIMS tube on a batch sparge system. As nice as burning my element out when draining sounds, I think I'll stick to not doing that for now. :mug:

MalFet 06-06-2012 05:34 PM

Quote:

Originally Posted by Rbeckett (Post 4148892)
Help me out here, please. Can you explain what exactly wind up is and what causes and negates it? I am still an electronics noob and have seen a couple of mentions of wind up but dont understand the concept from a practical stand point. Any light you could shed would be great!!! I am always increasing my knowledge and havent learned this yet. Thanks!!!!
Wheelchair Bob

The integral component of a PID adjusts power applied to the system in response to how long the measured value has been away from the set value. If you disconnect the heat source from the PID (as one might need to do), the PID will keep ramping up its output because it's not seeing a response.

Imagine trying open door that someone is blocking on the other side. You push harder and harder and harder when the thing doesn't budge, and then if the door suddenly gets unblocked you go barreling through the thing head over heels.

Rbeckett 06-06-2012 10:10 PM

Thanks a bunch. And you explained it in a way that makes great sense to me too. Have a great day.
Bob

carlisle_bob 06-06-2012 10:40 PM

Quote:

Originally Posted by MalFet (Post 4148908)
To stop applying heat to the system, mostly ;)

This is for a RIMS tube on a batch sparge system. As nice as burning my element out when draining sounds, I think I'll stick to not doing that for now. :mug:

Hi

Ok, if you shut things down while you are draining the system, you are about to re-load the system with cold water. If so, the answer is to restart the controller.

Bob

MalFet 06-06-2012 11:38 PM

Quote:

Originally Posted by carlisle_bob (Post 4149913)
Hi

Ok, if you shut things down while you are draining the system, you are about to re-load the system with cold water. If so, the answer is to restart the controller.

Bob

But I'm not reloading the system with cold water.

As I said, I'm looking for information on what does and doesn't reset the integral accumulation on Auber controllers. If anyone knows, I would be much obliged.

carlisle_bob 06-06-2012 11:45 PM

Quote:

Originally Posted by MalFet (Post 4150107)
But I'm not reloading the system with cold water.

As I said, I'm looking for information on what does and doesn't reset the integral accumulation on Auber controllers. If anyone knows, I would be much obliged.

Hi

Power cycling the controller reset it.

If you dump in cold water, the load has changed and the state of the PID is not useful. Reseting is your best bet in this case.

Bob

MalFet 06-06-2012 11:52 PM

Quote:

Originally Posted by carlisle_bob (Post 4150125)
Hi

Power cycling the controller reset it.

If you dump in cold water, the load has changed and the state of the PID is not useful. Reseting is your best bet in this case.

Bob

So you are saying that, of the four things I listed, you know that only (4) will actually reset the algorithm state? Switching to manual mode and back, for example, will not do this?


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