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

[Michael Bissett]

I have taken your advice and made the timestep, 0.125hr

Still I cannot get it to work. it is still switching on the time step
instead of the dead-band temp.

Mike

On Wed, Sep 21, 2011 at 3:33 PM, Matt Duffy <duffy at tess-inc.com> wrote:

>
> 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 at 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 at 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 at 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
>>> _______________________________________________
>>> TRNSYS-users mailing list
>>> TRNSYS-users at cae.wisc.edu
>>> https://mailman.cae.wisc.edu/listinfo/trnsys-users
>>>
>>>
>>
>>
>> --
>> *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 at aiguasol.coop
>> http://www.aiguasol.coop
>>
> ------------------------------
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://mailman.cae.wisc.edu/listinfo/trnsys-users
>
>
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