Re: [TRNSYS-users] PID Type 23 # of Warnings Exceeded

[Devin Rohan <drohan@purdue.edu>]

Thanks Mehdi for the guidelines.  However, I looked into the list file and it was saying that the beam radiation was negative for certain angles of incidences.  I looked at my weather file connections and found the error (the angle of incidence from the north of the weather file was connected to the west side of type 56).  So that fixed that problem.

Now, whenever I set the integral term to anything but zero, I get an error saying "invalid floating point operation" and the list file goes on to say "the controller was stuck during 0 time steps"  Does anybody know what is happening here.  Thanks again for all the help

On Sun, Jun 19, 2011 at 9:00 AM, Felix Beuteführ <beutefuf@fh-trier.de> wrote:

What does the warning massage say?

 

The simulation automatically stops after I think 400 Warning massages…….

 

Von: trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] Im Auftrag von Devin Rohan
Gesendet: Sonntag, 19. Juni 2011 14:19
An: trnsys-users@cae.wisc.edu
Betreff: [TRNSYS-users] PID Type 23 # of Warnings Exceeded

 

I have a PID controller (type 23) controlling the operative temperature of a room modeled in Type 56 through the an active layer floor heating system, where I control the water supply temperature and have a constant mass flow rate.  I tried to base it of the floor heating example TRNSYS provides in the feedback control example folder.  When I run the simulation, I get an error saying that the number of warnings allowed for a simulation has been exceeded.  How can I fix this?  Here is how I have my controller connected to the multizone building model:

 

 Equation Editor                    PID                        Type 56

T_operative_set=23  ---------> Setpoint

 

                                      Control Signal   --------->   T_supply

 

                                Controlled Variable  <--------    TOPLW  (long wave operative temperature)

 

 

Thanks for any help

 

--
Devin M. Rohan, LEED Green Associate
Purdue University
Civil/Architectural Engineering
drohan@purdue.edu

--
Devin M. Rohan, LEED Green Associate
Purdue University
Civil/Architectural Engineering
drohan@purdue.edu