| 詳細(xì)參數(shù) | |||
|---|---|---|---|
| 品牌 | GE | 型號 | IC693MDL250 |
| 結(jié)構(gòu)形式 | 模塊式 | 安裝方式 | 控制室安裝 |
| LD指令處理器 | 硬PLC | I/O點(diǎn)數(shù) | IC693MDL250 |
| 功能 | IC693MDL250 | 工作電壓 | 220 |
| 輸出頻率 | 220 | 處理速度 | 20 |
| 程序容量 | 10 | 數(shù)據(jù)容量 | 20 |
| 產(chǎn)品認(rèn)證 | ccc | 環(huán)境溫度 | 10 |
| 環(huán)境濕度 | 10 | 加工定制 | 否 |
| 重量 | 1 | 產(chǎn)地 | 美國 |
| 外形尺寸 | 10 | ||
IC693MDL250
IC693MDL250
IC693MDL250
IC693MDL250
本設(shè)計(jì)的內(nèi)容是PLC控制的恒壓供水系統(tǒng)，主要用到了PLC和變頻器，系統(tǒng)采用變頻調(diào)速方式自動調(diào)節(jié)水泵電機(jī)的速度，改變了以往先啟后停的方式，系統(tǒng)能夠自動和手動完成各個(gè)泵的啟動、停止和無沖擊切換，以及故障報(bào)警，使水壓平穩(wěn)過渡。
在恒壓供水控制系統(tǒng)設(shè)計(jì)中，對變頻器控制也進(jìn)行了必要的講解。包括變頻原理，變頻器的分類以及參數(shù)的設(shè)定。其硬件由PLC、變頻器、電機(jī)、繼電器等組成。詳細(xì)的論述了PLC的原理、變頻器的原理、硬件設(shè)計(jì)、軟件設(shè)計(jì)；操作、參數(shù)設(shè)定、控制系統(tǒng)圖的設(shè)計(jì)。
在設(shè)計(jì)中利用PLC控制變頻器，采用PID控制器，形成以壓力為閉環(huán)的控制系統(tǒng)，從而實(shí)現(xiàn)供水壓力的恒定，而泵的啟動和停止可以自動和手動來實(shí)現(xiàn)的。該系統(tǒng)運(yùn)行可靠，抗干擾性強(qiáng)，且具有經(jīng)濟(jì)性。
【關(guān)鍵詞】可編程控制器（PLC）；變頻器；繼電器；PID控制器
隨著變頻調(diào)速技術(shù)的發(fā)展和人們對生活飲用水品質(zhì)的不斷提高，變頻恒壓供水系統(tǒng)以逐漸取代原有的水塔供水系統(tǒng)，廣泛應(yīng)用于多層住宅小區(qū)生活消防供水系統(tǒng)。然而，由于新系統(tǒng)多會繼續(xù)使用原有系統(tǒng)的部分舊設(shè)備，所以，此技術(shù)用在對原有系統(tǒng)的改造過程中，既可以體現(xiàn)變頻控制恒壓供水的優(yōu)勢，又可以盡量保留原有的設(shè)備，有效的節(jié)省了大量的資金，并且可以保證系統(tǒng)的可靠的運(yùn)行。
1.1變頻調(diào)速恒壓供水設(shè)計(jì)方案
通過安裝在出水管網(wǎng)上的壓力傳感器，把出口壓力信號變成4-20mA的標(biāo)準(zhǔn)信號送入PID調(diào)節(jié)器，經(jīng)運(yùn)算與給定的壓力進(jìn)行比較，得出一比較參數(shù)，送給變頻器，由變頻器控制電機(jī)的轉(zhuǎn)速，調(diào)節(jié)系統(tǒng)的供水量，使供水管網(wǎng)上的壓力保持在給定的壓力上，當(dāng)用水量超過一臺泵的供水量時(shí)，通過PLC控制切換器進(jìn)行加泵。根據(jù)用水量的大小由PLC控制工作泵的數(shù)量增減及變頻器對水泵的調(diào)速，實(shí)現(xiàn)恒壓供水。當(dāng)供水負(fù)載變化時(shí)，輸入電機(jī)的電壓和頻率也隨之變化，這樣就構(gòu)成了以設(shè)定壓力為基準(zhǔn)的閉環(huán)控制系統(tǒng)。此外，系統(tǒng)還設(shè)有多種保護(hù)功能，充分保證了水泵的及時(shí)維修和系統(tǒng)的正常供水。
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