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

[Mehdi Shahrestani]

Hi

 

General guide: 

 

Set the PID integral time equal to simulation time step (10-20 minutes is a
good step) 

Set gain very small 

Set derivation equal 0 

 

Then have a look on the result, you have to play with gain (increase
gradually) first to get good response then change derivation to stabilise
the response. 

That is not a rule but mostly does the job.

 

Regards

Mehdi

 

 

 

 

  _____  

From: trnsys-users-bounces at cae.wisc.edu
[mailto:trnsys-users-bounces at cae.wisc.edu] On Behalf Of Devin Rohan
Sent: 19 June 2011 13:19
To: trnsys-users at cae.wisc.edu
Subject: [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 at purdue.edu

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