6SE3190-0DX87-2DA0產(chǎn)品介紹:
6SE3190-0DX87-2DA0
正弦波的負(fù)半周也可以用相同的方法來等效??刹捎谜也ㄅc三角波相交的方案來確定各分段矩形脈沖的寬度。當(dāng)逆變器輸出端需要升高電壓時,只要增大正弦波相對三角波的幅值,這時逆變器的輸出的矩形脈沖幅值不變而寬度相應(yīng)增大,達(dá)到了調(diào)壓的要求。當(dāng)逆變器的輸出端需要變頻時,只要改變正弦波的頻率就可以了。 [b]3 控制系統(tǒng)總體設(shè)計(jì) [/b] 過去的供水控制系統(tǒng)投資多,采用的模式為多臺小功率水泵供水。在運(yùn)行實(shí)踐中暴露出主控電路設(shè)計(jì)不合理和邏輯控制設(shè)計(jì)不合理的現(xiàn)象。 新系統(tǒng)總體設(shè)計(jì)方案如圖3所示。在該供水系統(tǒng)的控制電路中除采用了變頻器(VVVF),還采用一些先進(jìn)控制裝置如數(shù)字調(diào)節(jié)器(PID)、可編程控制器(PLC)等,這些裝置都是以電腦芯片為內(nèi)核完成各自不同的控制功能。 為簡化控制電路,根據(jù)負(fù)荷需要,使用一臺18.5KW大容量水泵供水。為提高使用的安全系數(shù),選用一臺日本富士22.5KW變頻器進(jìn)行水泵調(diào)速,該變頻器內(nèi)置PID調(diào)節(jié)功能,但不具備參數(shù)監(jiān)視功能。為能有效監(jiān)視調(diào)節(jié)工況,特選數(shù)字顯示調(diào)節(jié)器進(jìn)行監(jiān)視和控制,以備實(shí)現(xiàn)串級PID控制。鑒于外部I/O可控點(diǎn)數(shù)不多,可編程控制器PLC選用20點(diǎn)即可滿足控制要求。 [b]4 水位檢測電路設(shè)計(jì) [/b]4.1水位檢測開關(guān) 考慮到水位檢測裝置要求故障率少,運(yùn)行可靠,為簡化檢測環(huán)節(jié),設(shè)計(jì)中采用結(jié)構(gòu)簡單的浮子式水位檢測開關(guān),但為防止信號串?dāng)_,另外增加了一個隔離轉(zhuǎn)換裝置。該裝置內(nèi)選用了干簧繼電器用以提高開關(guān)接點(diǎn)的可靠性和使用壽命。 4.2水位檢測邏輯控制 水位檢測邏輯控制功能如前所述完全由可編程控制器PLc編程實(shí)現(xiàn),減少了硬件配置,提高了運(yùn)行的可靠性和應(yīng)用的靈活性。PLC的I/O地址分配見圖4(a)所示,簡化梯形圖如圖4(b)所示。其邏輯電路主要完成如下功能,見圖4(b)所示。 ?。?)水位信號保持功能水位開關(guān)檢測分別由PLC的常開接點(diǎn)實(shí)現(xiàn)。由于水位由于簧管的常開接點(diǎn)來檢測,只有在水面越過該點(diǎn)時閉合,低于該點(diǎn)即斷開,因此信號需由PLC保持。 (2)水位信號顯示、報(bào)警、保護(hù)功能水位正常時01002動作,使輸出綠燈亮。水位低時01003動作,使輸出紅燈亮,且通過其常閉接點(diǎn)停供水泵。水位高時20000、01000同時啟動,使輸出黃燈亮(閃光l5秒轉(zhuǎn)平光)且無條件停蓄水泵。
[b]5 操作保護(hù)功能設(shè)計(jì) [/b] 除了常規(guī)保護(hù)功能外還增加了人性化操作功能。考慮到泵短時間內(nèi)的頻繁啟動對泵運(yùn)行不利,故設(shè)置1分鐘內(nèi)只允許連續(xù)啟動兩次,第三次需延時3分鐘后進(jìn)行,以利泵的散熱,延長設(shè)備使用壽命,減少功耗。編程時可采用定時器和計(jì)數(shù)器配合來實(shí)現(xiàn)。這項(xiàng)功能在啟停調(diào)試設(shè)備過程中得到檢驗(yàn)。
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