[TRNSYS-users] PID controller problem - TRNSYS Message 315

[Giulio Tonellato]

I am having the same exact issue.
It came up super randomly  when activating my air handling unit that is heating up the air. I say randomly because it never appeared before even with the AHU on.
The PID controllers control radiators with a certain air set temperature in the rooms.
Only thing I changed  lately was the pipes’ geometry before and after radiators, but now changing it back does not seem to solve the problem.
Did you solve it in the end? Anyone knows about this?

Regards,

Giulio

The message was by Mariam Elnour
Mon Aug 6 07:38:12 PDT 2018

Dear TRNSYS users,

     I am having a problem with PID controllers performance . I tried modifying the components order however I still get the same warnings on all PID controllers units used in the project. The TRNSYS Message    315 is as follows,


"The TRNSYS processor has reported a potential problem with the connections in your input file. In version 16, there is a very specific calling order after convergence has been reached at each timestep. One of your connections flows against this calling order - for example you may have the output of an integrator connected as an input to a standard component (one that is being called iteratively at each timestep). While this is not technically an ERROR - it may cause incorrect values to be passed to the component. For example, the input to an iterating component from an integrator will be from the previously converged timestep and not the current timestep. Refer to the TRNSYS Manual - Volume 1 - for more information on the calling order for TRNSYS components"


Is there a way to solve this issue?


Thank you.
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