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Meysam

(@meysam)

New Member

عضو شده: 7 سال قبل

ارسال‌ها: 2

۱۴/۱۰/۱۳۹۷ ۱۰:۰۱ ب.ظ

با سلام و خسته نباشید خدمت اساتید محترم و همکاران گرامی ،

در پروژه ای فاصله بین کنترل ولو و سنسور ORP زیاد می باشد و به ازای تغییرات کنترل ولو تقریبا چهار دقیقه بعد سیال به سنسور ORP میرسد و به محض اینکه سیال به سنسور میرسد مقدار ORP تغییر میکند...بنده از فانکشن FB41 استفاده کردم ولی نتونستم پروسه رو کنترل کنم،و نوسان سیستم زیاد می باشد..البته فقط این لوپ کنترل رو بخاطر فاصله زیاد و تاخیر زمانی مشکل خوردم ، لوپهای دیگه که پاسخ سریعتر هستن با کنترل ضرایب PID سیستم پایدار و نوسانی ندارم.تقریبا شبیه لوپهای دما با پاسخ کند می باشد ولی فرقش اینه که به محض اینکه سیال به سنسور ORP میرسه سریع آنرا حس کرده و بلافاصله مقدار آن تغییر میکند.ضریب GAIN رو مقدار خیلی کم در حد هزارم دادم و TI رو 200 , مقدار TD رو 50 دادم ولی در این حالت خیلی کند میشه و اگه گین رو بالا ببرم تغییرات زیاد میشه..ممنون میشم راهنمایی بفرمایید .آیا در چنین پروسه هایی از فانکشن FB41 با تصحیح ضرایب P.I.D میتوان استفاده کرد؟

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kolahi

(@kolahi)

Estimable Member

عضو شده: 7 سال قبل

ارسال‌ها: 234

۱۵/۱۰/۱۳۹۷ ۲:۱۴ ب.ظ

شما نیاز به فانکشنی دارید که Dead Time و Time Lag داشته باشه . میزان تاخیر را حساب کنید و به Dead Time بدهید

یا از روش Smith که در کتاب PCS7 مهندس ماهر جلد 2 گفته شده استفاده کنید

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Meysam

(@meysam)

New Member

عضو شده: 7 سال قبل

ارسال‌ها: 2

۱۶/۱۰/۱۳۹۷ ۳:۲۷ ب.ظ

ممنون از پاسخ شما..

ولی من از cpu315_2dp استفاده میکنم، آیا میتونم از فانکشن smith در S7 استفاده کنم؟

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kolahi

(@kolahi)

Estimable Member

عضو شده: 7 سال قبل

ارسال‌ها: 234

۱۶/۱۰/۱۳۹۷ ۳:۴۷ ب.ظ

خیر فانکشن Smith خاص 400 است.

برای 300 اگر جدید باشه و بتونید از TIA Portal استفاده کنید امکانات PID زیاد داره

اگر 300 قدیمی باشه بهتره نرم افزارهای تکمیلی مثل Modular PID را نصب کنید که امکانات بیشتر دارند

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آخرین ارسال: راه اندازی کلاینت جدیدترین عضو ما: saeid ارسال های اخیر Unread Posts Tags

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آیکن های موضوع: Not Replied پاسخ داده شده فعال داغ مهم تایید نشده حل شده خصوصی بسته شده

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