<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><div><br></div><div><br></div><div>Thank you in advance</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 26, 2014 at 10:16 PM, <span dir="ltr"><<a href="mailto:trnsys-users-request@lists.onebuilding.org" target="_blank">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>
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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>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">bridjesh<div><br></div></div>
</div>