[TRNSYS-users] PID Controller

[David Bradley]

Jace,
  There is no fundamental incompatibility. Type647 expects a value 
between 0 and 1 and the way you have your PID set up, it sounds like it 
is outputting a value between 0 and 1. Bear in mind that Type647 does 
not automatically divert the remainder of the flow to the other port. If 
you have two outlets and all the flow that does not go one direction 
automatically goes the other way, you might consider using Type11-f. And 
no, this is not the first time I have ever recommended using a standard 
Type in place of a TESS Type... :-)
Best,
  David


On 5/4/2010 00:51, LE GALL, Jace wrote:
>
> Dear TRNSys users,
>
> I am currently using a PID Controller to modulate the water flow in a 
> chilling installation. The control signal varies from 0 to 1 
> accordingly to the temperature of the air I want to control but it 
> does not have any impact on the Type647 valve I have used to divert 
> the flow. I therefore have no regulation at all (waterflow remains 
> constant). Do you know if there is any incompatibility between these 2 
> types (no message of compatibility problem between output and input is 
> shown)?
>
> Thank you for your help.
>
> Best regards
>
> Jace LE GALL
>
> BYME Engineering Hub
>
> --
> Les donnees et renseignements contenus dans ce message sont personnels, confidentiels et secrets. Toute publication, utilisation ou diffusion, meme partielle, doit etre autorisee. Si vous n'etes pas le bon destinataire, nous vous demandons de ne pas lire, copier, utiliser ou divulguer cette communication. Nous vous prions de notifier cette erreur a l'expediteur et d'effacer immediatement cette communication de votre systeme.
>
> Any data and information contained in this electronic mail is personal, confidential and secret. Any total or partial publication, use or distribution must be authorized. If you are not the right addressee, we ask you not to read, copy, use or disclose this communication. Please notify this error to the sender and erase at once this communication from your system.
>    
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>    
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20100504/7e059286/attachment-0005.htm>