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<p>Sounds to me like it's time for you to write a component model! While we have several models that are somewhat close, none of them do exactly as you suggest. Check out the TESS Controlller library for models close to the one you need.</p>
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<p>Jeff</p>
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<p>Jeff Thornton</p>
<p><em>President - TESS LLC</em></p>
<p><em>22 N. Carroll Street, Madison WI USA 53703</em></p>
<p><em>Office: (608) 274-2577 Fax: (608) 278-1475</em></p>
<p><em>www.tess-inc.com</em></p>
<p><em>E-Mail: thornton@tess-inc.com</em></p>
<p> </p>
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<p>On 07/10/2012 1:00 pm, Hasan baig wrote:</p>
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%"><!-- html ignored --><!-- head ignored --><!-- meta ignored --><span style="color: #222222; font-family: arial,sans-serif; font-size: 12.727272033691406px; background-color: #ffffff;">Hi,</span>
<div style="color: #222222; font-family: arial,sans-serif; font-size: 12.727272033691406px; background-color: #ffffff;">I wish to model a real differential controller for my variable speed pump. The controller works as a standard differential controller. If the switch-on difference is reached, the pump is activated. When the temperature difference falls below the adjusted switch-off temperature difference, the respective relay switches off. When the switch-on temperature difference is reached, the pump is activated at full speed for 10 seconds. Then, the speed is reduced to the minimum pump speed value (factory setting = 30 %). If the temperature difference reaches the adjusted nominal temperature difference, the pump speed increases by one step (10 %). If the difference increases by the adjustable rise value, the pump speed increases by 10 % respectively until the maximum pump speed of 100 % is reached. </div>
<div style="color: #222222; font-family: arial,sans-serif; font-size: 12.727272033691406px; background-color: #ffffff;">Any suggestions on how to model this pump in TRNSYS ?</div>
<div style="color: #222222; font-family: arial,sans-serif; font-size: 12.727272033691406px; background-color: #ffffff;">regards</div>
<div style="color: #222222; font-family: arial,sans-serif; font-size: 12.727272033691406px; background-color: #ffffff;">Hasan </div>
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