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Re: [TRNSYS-users] Type 2b controller dead band problem.


Dear Michael,

Please make sure that you are using a reasonable timestep such as 0.125 hr (type in terms of hours to avoid problems with the Studio's minute conversion trucation). Also, make sure that you have the latest TRNSYS and TESS Libraries versions as well.

Best regards,

Matt Duffy

----- Original Message -----
From: "Michael Bissett" <mikebiscuit@gmail.com>
Sent: Tue, September 20, 2011 12:44
Subject: Re: [TRNSYS-users] Type 2b controller dead band problem.

Hi 
 
I have read the information, I have tried to ! increase parameter 1, I have also looped the controller to its self. Still it does not work
I have also tried changing many other parameters and have spent a lot of time on this problem. still with no luck.
 
Any other suggestions?
 
Mike
 
 
 

On Tue, Sep 20, 2011 at 1:59 PM, Angel Carrera <angel.carrera@aiguasol.coop> wrote:

Mike,

you should connect the output control function of the controller to its own input control function (Input number 4). Also, you should increase the value of parameter 1, to the default value at least (the influence of this parameter is explained at the type ! 2 documentation, I recommend you to read it, together with the generic section for controllers at the trnsys help)

Regards

Angel


 
2011/9/19 Michael Bissett <mikebiscuit@gmail.com>
 
Dear Trnsys
 
I am experiencing problems with a simple type 2b controller.
 
I am using a solar collector type 564b
 
I am trying to compare the temperature of the output of the collector with output of the tank, getting a temperature difference. I have set the dead band from 4-10 degrees C.
 
In the simulation as the temperature rises to 10degrees difference, the control signal is 1 switching the pump on! correctly. but after this the controller only switches every time step. I have tried shortening the time step... and changing other parameters.. still with no success.
 
I have attached the file.
 
Yours Sincerely
 
Mike Bissett
 
Department of Electrical Engineering
University of Cape Town 
South Africa
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--
Àngel Carrera

Responsable I+D
Àrea tècnica

Sistemes Avançats d'Energia Solar Tèrmica SCCL
C/ Roger de Llúria, 29 3r 2a 08009 Barcelona
Tel: (+34) 93 342 47 55 Fax: (+34) 93 342 47 56

angel.carrera@aiguasol.coop
http://www.aiguasol.coop
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