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<p>You may try using a different controller. The PID controller in the standard library and one of the n-stage differential controllers in the TESS Controls Library come to mind. And definitely use smaller timesteps - we prefer a 1-minute timestep for most applications.</p>
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<p>Jeff</p>
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<pre>---<br />Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton@tess-inc.com
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<p>On 11/26/2014 3:37 pm, bridjesh gautam wrote:</p>
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<div dir="ltr">Thank you MR. Heymer and Thronton
<div>I connected control function directly to Type 46 and worked well but I do have one more question.</div>
<div>I am controlling Type 110 pump with Type 22 controller and have noticed pump always starts with a peak of rated volume flow. My pump has minimum flow ,25% of rated mass flow and setting minimum control function to 0.25 or even 0 does not help. </div>
<div>I tried changing Threshold for non-zero output and Maximum number of oscillations to various value still having no luck. </div>
<div>I read that pump does not model on-off condition does that mean running simulation with very small time steps(>1 min) will have bigger impact on overall result ? What can be done so pump does not always start at the peak? </div>
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<div>Thank you in advance</div>
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<div class="gmail_quote">On Wed, Nov 26, 2014 at 10:16 PM, <span><<a href="mailto:trnsys-users-request@lists.onebuilding.org">trnsys-users-request@lists.onebuilding.org</a>></span> wrote:<br />
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;">Send TRNSYS-users mailing list submissions to<br /> <a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a><br /><br /> To subscribe or unsubscribe via the World Wide Web, visit<br /> <a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><br /><br /> or, via email, send a message with subject or body 'help' to<br /> <a href="mailto:trnsys-users-request@lists.onebuilding.org">trnsys-users-request@lists.onebuilding.org</a><br /><br /> You can reach the person managing the list at<br /> <a href="mailto:trnsys-users-owner@lists.onebuilding.org">trnsys-users-owner@lists.onebuilding.org</a><br /><br /> When replying, please edit your Subject line so it is more specific<br /> than "Re: Contents of TRNSYS-users digest..."<br /><br />Today's Topics:<br /><br /> 1. Re: On off time calculator type 980 (Jeff Thornton)<br /><br /><br />---------- Forwarded message ----------<br />From: Jeff Thornton <<a href="mailto:thornton@tess-inc.com">thornton@tess-inc.com</a>><br />To: "TRNSYS users mailing list at OneBuilding.org" <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>><br />Cc: "TRNSYS users mailing list at OneBuilding.org" <<a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a>><br />Date: Wed, 26 Nov 2014 09:22:35 -0600<br />Subject: Re: [TRNSYS-users] On off time calculator type 980<br />Type 24 already accounts for the time step. As Ben suggests, simply connect the same control signal that you use to drive the pump to an integrator as well.<br /><br /> Jeff Thornton<br /> TESS<br /><br /> Sent from my iPhone<br /><br /> > On Nov 26, 2014, at 8:31 AM, Ben Heymer <<a href="mailto:bheymer@gmail.com">bheymer@gmail.com</a>> wrote:<br /> ><br /> > You could integrate the control signal to the pump (should be 0 to 1)<br /> > or build your own simple counter using an equation and an integrator,<br /> > such as type 24, based on some output value from the pump. For<br /> > example:<br /> ><br /> > gt(pump_flow_rate,0) * timestep --> integrator<br /> ><br /> > Type 24 may already account for the time step, you will have to check.<br /> ><br /> > Cheers,<br /> > Ben Heymer, PE<br /> ><br /> > On Wed, Nov 26, 2014 at 4:07 AM, bridjesh gautam<br /> > <<a href="mailto:bridjeshgautam@gmail.com">bridjeshgautam@gmail.com</a>> wrote:<br /> >> Dear. Trnsys users<br /> >> I need to find out how many hours my pump was on in the simulation. I found<br /> >> type 980 can give me the current running on and off time but not the total<br /> >> ,as it starts from zero next time it is on or off. Is there any other way to<br /> >> find that out ?<br /> >><br /> >> Thank you<br /> >><br /> >><br /> >> _______________________________________________<br /> >> TRNSYS-users mailing list<br /> >> <a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><br /> >> <a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><br /> >><br /> > _______________________________________________<br /> > TRNSYS-users mailing list<br /> > <a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><br /> > <a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><br /><br /><br />_______________________________________________<br /> TRNSYS-users mailing list<br /><a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><br /><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><br /><br /></blockquote>
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<div class="gmail_signature">bridjesh
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