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<p>Thomas,</p>
<p> If you have access to the TESS controllers library then you will
find a controller with lockouts such that if it decides to turn on
a pump or fan (or other) then that device has to run for a certain
amount of time before it can turn off. There are lockouts on shut
down as well.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 12/27/2019 03:58, Thomas Heyn via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:trinity-d7172078-34a2-469d-8225-a9196192254c-1577440733527@msvc-mesg-web102">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
Hello,<br>
<br>
I try to simulate a floor heating system using the active layer on
type 56. So far this works. For control I like to use a pi
controller but using a pwm output with a period of 20 min (so 50%
controller output would be 10 min flow on and 10min flow off). I
will therefore set the simulation interval down to 1 Mon or lower.
<br>
<br>
What I already can do is to scal the pi controller output to
0...20.<br>
<br>
What I struggle to do is to "read" the controller output only
every 20th simulation step and realise the pwm using equations and
value recall. <br>
<br>
So the logic is: Every 20 min the controller output, say=5 is
received and for the next 5 (as example) min flow for the active
layer is 100% and for the following 15 min the flow is 0%<br>
<br>
<br>
Any ideas?<br>
Mit freundlichen Grüßen<br>
Thomas Heyn<br>
<a href="http://thomas.heyn" moz-do-not-send="true">thomas.heyn</a>@web.de
<br>
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<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>
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