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temperature control

10/9/2014 12:52 PM	Rate (0)
gigx205 Posts: 7 Rating: (0)	Hello, Process: AI3= PT100 probe Q1= Pump T= 0-50℃ -adjustable lower and upper limit(max.50℃) beetween this ranges (I am using acc. of the counter) range: 0-20 ℃ - pump is ON until 20℃ without timer --21-50 ℃ : every 30 min temperature must rise for 1℃ or too be clear it is a regulator which holds the temperature in range 21-50℃ and after 30 min it holds next one a 1℃ higher. I am using math function and MUX in LOGO. I did only step from 20-21℃, and 21-22℃.... First regulator: SP= counter - lower limit Second regulator: SP= math function : "counter - lower limit" + 10 + " MUX" MUX has value 10 (1℃). when async.generator is off it swich the MUX and of math fun. value increases from 21-22℃ Thank you in advance. Igor
gigx205 Posts: 7 Rating: (0)
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10/9/2014 1:53 PM	Rate (0)
190B Posts: 2347 Rating: (385)	hello, already in this thread: /tf/WW/en/Posts/115378#top They were asked to describe exactly what you really want or what is your question?
190B Posts: 2347 Rating: (385)
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10/9/2014 1:59 PM	Rate (0)
gigx205 Posts: 7 Rating: (0)	Yes I know. I hope for some solution.... My problem is how to increase a temperature for one 1 deegree when timer passes 30 min. I use a PI regulator.
gigx205 Posts: 7 Rating: (0)
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10/9/2014 2:09 PM	Rate (0)
190B Posts: 2347 Rating: (385)	Use but the function block "ramp" for a linear increase or decrease over a fixed period rather than the PI controller.
190B Posts: 2347 Rating: (385)
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10/9/2014 3:05 PM	Rate (0)
gigx205 Posts: 7 Rating: (0)	Yes, but I can only enter a number under "largest output value". i can not use the counter for the temperature limits. user must enter lower and upper temp. limit.
gigx205 Posts: 7 Rating: (0)
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10/9/2014 5:52 PM	Rate (0)
190B Posts: 2347 Rating: (385)	What I still do not understand: How should the pump output are controlled for? By PI controller and then on PWM? And for which LOGO! ? 0BA6 or 7 or 8?
190B Posts: 2347 Rating: (385)	Last edited by: 190B at: 10/9/2014 5:54 PM
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10/10/2014 2:15 PM	Rate (0)
gigx205 Posts: 7 Rating: (0)	Hi guys I made it. PI Regulator wih low/high temp. select. and 1 degree C rise after low limit with timer. Attachment Circuit Diagram1.zip (477 Downloads)
gigx205 Posts: 7 Rating: (0)
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