6ES75225FH000AB0

6ES75225FH000AB0

6ES75225FH000AB0

6ES75225FH000AB0

6ES75225FH000AB0

某棉紡廠使用的梳棉機(jī)老機(jī)在設(shè)計(jì)方面由于受到當(dāng)時(shí)的技術(shù)條件、設(shè)備制造成本，市場需要等因素的限制不可避免的存在著一些缺陷。如A186D型梳棉機(jī)道傳動系統(tǒng)中的電磁離合器由于故障較高，經(jīng)常造成停臺，不時(shí)出火警，給生產(chǎn)效率與產(chǎn)品質(zhì)量造成一定的損失，要保持與維護(hù)需投入大量的人力與物力。慣性輪電磁離合器被棄用。這樣在道夫慢轉(zhuǎn)快的過程中產(chǎn)生細(xì)條，嚴(yán)重時(shí)出現(xiàn)破邊，棉網(wǎng)拉斷的現(xiàn)象影響生條質(zhì)量。為避免這種現(xiàn)象，操作工用不當(dāng)?shù)牟僮鬓k法來彌補(bǔ)以上設(shè)備缺陷，但要造成大量的廢條，同樣是不可取的。 
使用SOHO-SM矢量變頻器改善梳棉機(jī)運(yùn)行狀態(tài)的過程：A186D梳棉機(jī)為了使道夫達(dá)到升、降速平滑，在機(jī)械傳動中設(shè)計(jì)雙速電機(jī)，慣性輪、電磁離合器，用電氣加機(jī)械的手段來實(shí)現(xiàn)。A186E、A186F、FA201梳棉機(jī)設(shè)計(jì)中又增加了電動機(jī)的星-三角轉(zhuǎn)換這一控制環(huán)節(jié)，從而進(jìn)一步改善了升、降速斜率。FA201B、FA212梳棉機(jī)采用了SOHO-SM矢量變頻器調(diào)速，從而實(shí)現(xiàn)了道夫升速斜率的任意調(diào)節(jié)，道夫工藝轉(zhuǎn)速的任意可變的功能。為老機(jī)改造提供一個(gè)好的范例。 
對A186D老機(jī)進(jìn)行SOHO-SM矢量變頻器調(diào)速改造，不但提高設(shè)備性能，降低故障停臺。還能提高生產(chǎn)效率與生條質(zhì)量。
三、SOHO-SM變頻器在提升設(shè)備中的應(yīng)用
SOHO-SM變頻調(diào)速器以16位或32位微處理器為核心，內(nèi)部包括控制和驅(qū)動兩大部分。變頻器可通過其外部控制端子實(shí)現(xiàn)啟停、正反轉(zhuǎn)、S曲線加減速及多段速度控制。矢量控制運(yùn)算中要用到的電機(jī)本身的一些參數(shù)，可由變頻器自動測出。此外，該變頻器還具有過流、過載、電動機(jī)過熱、過壓及欠壓，超速及失速等保護(hù)功能。變頻器還能提供運(yùn)行停止信號，零速信號，速度到達(dá)信號及運(yùn)行準(zhǔn)備信號等，可編程控制器綜合外部信號和變頻器給出的控制信號，經(jīng)分析及邏輯運(yùn)算向外部設(shè)備及變頻器給出控制命令。電梯調(diào)速控制的關(guān)鍵是啟動加速和減速平層，對其控制時(shí)要掌握以下幾點(diǎn)：
1、啟動控制
為使電梯啟動時(shí)平穩(wěn)無沖擊，無反向溜車，啟動控制應(yīng)按以下順序：
（1）首先向變頻器發(fā)出預(yù)勵磁命令，給電動機(jī)建立磁場(此時(shí)速度給定為零)；
（2）經(jīng)第一級延時(shí)后發(fā)出打開抱閘指令；
（3）再經(jīng)第二級延時(shí)確認(rèn)抱閘打開后給出速度指令。

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