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Krishna,<br>
One solution could be that you use either Type93 or Type573 (in
the TESS Libraries) to delay the temperature you are monitoring by one
time step and then to control based on the delayed temperature. In order
to do this, you need to have a relatively small time step (on the order
of 5 minutes or less) but by controlling on the system values from one
time step previous, you are guaranteed to always be controlling based on
a converged value.<br>
Cheers,<br>
David <br><br>
At 09:18 AM 7/20/2005, Krishna wrote:<br>
<blockquote type=cite class=cite cite=""><font face="arial" size=2>
I have a system with iterative feedback
controller(Type 22) to control the flow rate based on the error
signal(Temperature). In the secant method used by this type, one
assumption would be that the error signal produced by a control signal is
repeatable (so that the control signal can be interpolated). But it takes
a few iterations for the system to give out a constant error signal(i.e
Converged values) for a given control signal.<br>
This makes the secant method unusable unless we use the
converged values to determine what the next control signal should
be.<br>
One way to work over this could be that we check for
convergence and the calculate the new control signal and then instruct
trnsys that the system is not converged yet for the current time step and
do this until the desired control signal is calculated.<br>
</font> <br>
<font face="arial" size=2>Could anyone please let me know if this is
possible or if there is a better method to solve this problem.<br>
Thank you,<br>
krishna<br>
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