[TRNSYS-users] (no subject)

[Ben Heymer]

You should look through your "Result" file for the source of the error.

A common cause of errors of this type is convergence. Make sure you
have enough volume in your water loop for at least 1 timestep of water
flow. Sometimes it's also helpful to connect the mass flow output of
the pump right back to the mass flow input.

As a last resort, you can relax the convergence parameters and error
thresholds in the control cards.

Ben Heymer, PE

On Thu, Nov 20, 2014 at 3:52 AM, Michael Stochniol
<stochnio at mail.hs-ulm.de> wrote:
> Hallo everyone,
>
> im trying to create a control function using equations with logic operators for the control of a variable speed pump, in order to adjust the massflow trough the pump. I wrote a control funktion and plotted it without connecting it to the pump and it seemed to work right. But if i am conecting it to the pump my simulation freezes after around 700 timesteps or less. I am trying to create solar domestic hot water system. The question is, is it possible to create this kind of control circuit with equations ? I have similar problems with every control loop i am trying to create this way. The math should work but implemented  in TRNSYS (TRNSYS 17) the simulation stick somewhere.
>
> I am no experienced user so maybe someone could give my some advise how to implement this kind of control functions right?
>
> i am very grateful for any help or ideas.
>
> thanks in advance
>
> Michael Stochniol
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