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<p>Sajid,</p>
<p> 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. <br>
</p>
<p><br>
</p>
<p> 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.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 04/25/2019 06:26, MEHMOOD Sajid via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:DB6PR0502MB2933977679B7FA4797072468903D0@DB6PR0502MB2933.eurprd05.prod.outlook.com">
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
Dear Trnsys users,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
I am facing following two errors.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<b>Error 1.</b> Trnsys Message 203: A convergence problem was
encountered. Modification of the TOLERANCE control card may cure
the problem.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
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?</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<b>Error 2</b>. Trnsys Message 450: <img size="10156"
tabindex="-1" style="max-width:100%"
data-outlook-trace="F:1|T:1"
src="cid:part1.26BF3F0B.0AFE7CDE@tess-inc.com" class=""></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
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.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
Thank you.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
Best Regards,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
Sajid</div>
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
***************************
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
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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