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PID implementation

Created by: BulentO at: 12/23/2006 12:01 PM (1 Replies)

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12/23/2006 12:01 PM	Rate (0)
BulentO Posts: 11 Rating: (1)	Dear Sir, May be this question was asked before but i searched this Forum butcould not find any satisfying answer. I want to control a water valve according to a tank temperature in my automation task. details are ; Tank temperature Set Point (SP) : 25 degree , allowed band width is +, - 2 degree (27-23) .my high limit is 35 degree and minimum tank temp is. 10 degree . I want my water valve fully open %100 at 35 degree and fully closed at 10 degree. I studied this problem but coulndt solve. in FB41 manipulated value LMN goessuddenly to 100 when temperature goes over 27. and goes suddenly to 0 when temp. below 23. for example I want my valve to open % 70-80 when goes over 27. How can i configure these parameters in FB41. also information i used are Gain :1 , PV_FAC :1 , LM_HLM : 100, LM_LLM : 0, TI time :20 sec, TD time 20 sec. no manuel control selected. İ called also this block in OB1. Please inform me as soon as possible because now the task is controlled manually. Best Regards, Bulent Ozigci
BulentO Posts: 11 Rating: (1)
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12/23/2006 12:44 PM	Rate (1)
Late Platinum Member Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	Hi B, FB41 is a PID block and can not use certain stands for the output, you then have to built them by your self on the outside. [:blush:] The blocking of the valve for certain places (min/max)is easily to do with the minimum and maximum range of the output of FB41. With Modulaire PID you can do this very easy. Thats a package to built all kind off controllers that are not standard. [:o] See the handbook: Modular PID Control and Modular PID Control Getting Started for more infornation and possibilitys of the modular PID blocks. [8)] So you might use this blocks or you have to built it around FB41 (Tip: block the controller when you are on a range where you didn't want that the valve is opened further or less, because you will be get a windup of the I-action of the PID controller). [8)]
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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