11/20/2008 12:50 PM | |
Posts: 661 Rating: (123) |
Hello, you could use the PWM function additionally to the pi controller: AttachmentPI and PWM.zip (959 Downloads) |
11/20/2008 1:14 PM | |
Posts: 8 Rating: (0) |
I helped myself with one of the previous forum topic...(heating and cooling) i just modified it a bit...and i think this would work...i only have one question...how you determine gain that the measured temp with pt100 will be realistic...Take a look...thanks
Attachmentregulacija_proba.zip (782 Downloads) |
11/27/2008 6:52 PM | |
Posts: 191 Rating: (58) |
Hi!! the regulation you are trying to do of +- 1 or 2º with an ON/OFF output is not easy.. i´d just use an analog threshold trigger with the setpoint temperature in the ON and OFF parameter,( the same value without histeresys)and maybe asmallON DEALY block just to avoid ouput fastswitching the problem with this is that the output is going to switch very often and the relay is going to wear out... ¿¿ are you using a resistor to heat your process ?? there are some solid state relaysthat deliver a variavle AC voltage depending on a 0-10V signal.. maybe you could use the PID block and an analog output to make a more accurate control, but this is not acheap solution. http://www.crydom.com//userResources/productFamilies/51/crydom_MCPC.pdf hope this helps!! ROSA |
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