[TRNSYS-users] Errors

[David BRADLEY]

Sajid,

   Convergence errors occur if TRNSYS can't determine a solution at a 
given time step. Non-convergence is a warning (not an error) but if 
enough time steps don't converge then an error is issued. While it is 
possible just to loosen the tolerances or increase the number of 
allowable warnings, it is far preferable to track down the cause of the 
non convergence and solve it. Usually the problem is that the time step 
is too big and/or that there is not enough thermal capacitance in the 
system.


   The TOLERANCES and LIMITS are both set in the control cards (where 
you set the simulation start times, stop time, and time step.) In 
Trnsys17 they are on the main tab. In Trnsys18 they are on the 
"advanced" tab.

kind regards,

  David



On 04/25/2019 06:26, MEHMOOD Sajid via TRNSYS-users wrote:
> Dear Trnsys users,
>
> I am facing following two errors.
>
> *Error 1.* Trnsys Message 203: A convergence problem was encountered. 
> Modification of the TOLERANCE control card may cure the problem.
> To tackle this error i reduced time step but then simulation studio 
> take almost half an hour to perform one simulation. What else i can 
> try to fix this error?
>
> *Error 2*. Trnsys Message 450:
> My question is, how i can increase the number of these warning at my 
> computer. Message says use LIMITS command. But i am unable to 
> understand that how and where i have to use this command. Please shed 
> some light on this as well.
>
> Thank you.
>
>
> Best Regards,
> Sajid
> The University of Edinburgh is a charitable body, registered in 
> Scotland, with registration number SC005336.
>
> _______________________________________________
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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