描述

R200S418NQBAEZZZZ

變頻器的正確選擇對(duì)于控制系統(tǒng)的正常運(yùn)行是非常關(guān)鍵的。選擇變頻器時(shí)必須要充分了解變頻器所驅(qū)動(dòng)的負(fù)載特性。人們?cè)趯?shí)踐中常將生產(chǎn)機(jī)械分為三種類型:恒轉(zhuǎn)矩負(fù)載、恒功率負(fù)載和風(fēng)機(jī)、水泵負(fù)載。

? ? 1、根據(jù)負(fù)載特性選擇變頻器，如負(fù)載為恒轉(zhuǎn)矩負(fù)載需選變頻器，如負(fù)載為風(fēng)機(jī)、泵類負(fù)載應(yīng)選擇風(fēng)機(jī)、泵類變頻器。因?yàn)轱L(fēng)機(jī)、水泵會(huì)隨著轉(zhuǎn)速增大力矩。而剛啟動(dòng)時(shí)力矩較小。

? ? 2、選擇變頻器時(shí)應(yīng)以實(shí)際電機(jī)電流值作為變頻器選擇的依據(jù)，電機(jī)的額定功率只能作為參考。另外,應(yīng)充分考慮變頻器的輸出含有豐富的高次諧波，會(huì)使電動(dòng)機(jī)的功率因數(shù)和效率變壞。因此用變頻器給電動(dòng)機(jī)供電與用工頻電網(wǎng)供電相比較，電動(dòng)機(jī)的電流會(huì)增加10％而溫升會(huì)增加20％左右。所以在選擇電動(dòng)機(jī)和變頻器時(shí)，應(yīng)考慮到這種情況，適當(dāng)留有余量，以防止溫升過(guò)高，影響電動(dòng)機(jī)的使用壽命。

? ? 3、變頻器若要長(zhǎng)電纜運(yùn)行時(shí)，此時(shí)應(yīng)該采取措施抑制長(zhǎng)電纜對(duì)地耦合電容的影響，避免變頻器出力不夠。所以變頻器應(yīng)放大一、兩檔選擇或在變頻器的輸出端安裝輸出電抗器。

? ? 4、對(duì)于一些特殊的應(yīng)用場(chǎng)合，如高環(huán)境溫度、高開關(guān)頻率（尤其是在樓宇自控等對(duì)噪音限制較高的應(yīng)用場(chǎng)所使用時(shí)需注意）、高海拔此時(shí)會(huì)引起變頻器的降容，變頻器需放大一檔選擇。

? ? 5、當(dāng)變頻器用于控制并聯(lián)的幾臺(tái)電機(jī)時(shí)，一定要考慮變高度等，頻器到電動(dòng)機(jī)的電纜的長(zhǎng)度總和在變頻器的容許范圍內(nèi)。如果超過(guò)規(guī)定值，要放大一檔或兩檔來(lái)選擇變頻器。另外在此種情況下，變頻器的控制方式只能為V/F控制方式，并且變頻器無(wú)法實(shí)現(xiàn)電動(dòng)機(jī)的過(guò)流、過(guò)載保護(hù)，此時(shí)需在每臺(tái)電動(dòng)機(jī)側(cè)加熔斷器來(lái)實(shí)現(xiàn)保護(hù)。

? ? 6、使用變頻器控制高速電機(jī)時(shí)，由于高速電動(dòng)機(jī)的電抗小，會(huì)產(chǎn)生較多的高次諧波。而這些高次諧波會(huì)使變頻器的輸出電流值增加。因此，選擇用于高速電動(dòng)機(jī)的變頻器時(shí)，應(yīng)比普通電動(dòng)機(jī)的變頻器稍大一些。

? ? 7、變頻器用于變極電動(dòng)機(jī)時(shí)，應(yīng)充分注意選擇變頻器的容量，使其最大額定電流在變頻器的額定輸出電流以下。另外，在運(yùn)行中進(jìn)行極數(shù)轉(zhuǎn)換時(shí)，應(yīng)先停止電動(dòng)機(jī)工作，否則會(huì)造成電動(dòng)機(jī)空轉(zhuǎn)，惡劣時(shí)會(huì)造成變頻器損壞。

? ? 8、驅(qū)動(dòng)防爆電動(dòng)機(jī)時(shí)，變頻器沒(méi)有防爆構(gòu)造，應(yīng)將變頻器設(shè)置在危險(xiǎn)場(chǎng)所之外。

? ? 9、使用變頻器驅(qū)動(dòng)齒輪減速電動(dòng)機(jī)時(shí)，使用范圍受到齒輪轉(zhuǎn)動(dòng)部分潤(rùn)滑方式的制約。潤(rùn)滑油潤(rùn)滑時(shí)，在低速范圍內(nèi)沒(méi)有限制；在超過(guò)額定轉(zhuǎn)速以上的高速范圍內(nèi)，有可能發(fā)生潤(rùn)滑油用光的危險(xiǎn)。因此，不要超過(guò)最高轉(zhuǎn)速容許值。

? ? 10、變頻器驅(qū)動(dòng)繞線轉(zhuǎn)子異步電動(dòng)機(jī)時(shí)，大多是利用已有的電動(dòng)機(jī)。繞線電動(dòng)機(jī)與普通的鼠籠電動(dòng)機(jī)相比，繞線電動(dòng)機(jī)繞組的阻抗小。因此，容易發(fā)生由于紋波電流而引起的過(guò)電流跳閘現(xiàn)象，所以應(yīng)選擇比通常容量稍大的變頻器。一般繞線電動(dòng)機(jī)多用于飛輪力矩GD2較大的場(chǎng)合，在設(shè)定加減速時(shí)間時(shí)應(yīng)多注意。

? ? 11、變頻器驅(qū)動(dòng)同步電動(dòng)機(jī)時(shí)，與工頻電源相比，會(huì)降低輸出容量10％～20％，變頻器的連續(xù)輸出電流要大于同步電動(dòng)機(jī)額定電流與同步牽入電流的標(biāo)幺值的乘積.

? ? 12、對(duì)于壓縮機(jī)、振動(dòng)機(jī)等轉(zhuǎn)矩波動(dòng)大的負(fù)載和油壓泵等有峰值負(fù)載情況下，如果按照電動(dòng)機(jī)的額定電流或功率值選擇變頻器的話，有可能發(fā)生因峰值電流使過(guò)電流保護(hù)動(dòng)作現(xiàn)象。因此，應(yīng)了解工頻運(yùn)行情況，選擇比其最大電流更大的額定輸出電流的變頻器。

? ? 13、變頻器驅(qū)動(dòng)潛水泵電動(dòng)機(jī)時(shí)，因?yàn)闈撍秒妱?dòng)機(jī)的額定電流比通常電動(dòng)機(jī)的額定電流大,所以選擇變頻器時(shí)，其額定電流要大于潛水泵電動(dòng)機(jī)的額定電流。

? ? 14、當(dāng)變頻器控制羅茨風(fēng)機(jī)或特種風(fēng)機(jī)時(shí)，由于羅茨風(fēng)機(jī)為容積形鼓風(fēng)機(jī)，具有輸出風(fēng)壓高的特點(diǎn)。從電機(jī)特性來(lái)看，其轉(zhuǎn)矩特性近似為恒轉(zhuǎn)矩特性，其起動(dòng)電流很大，所以選擇變頻器時(shí)一定要注意變頻器的容量是否足夠大。

? ? 15、選擇變頻器時(shí)，一定要注意其防護(hù)等級(jí)是否與現(xiàn)場(chǎng)的情況相匹配。否則現(xiàn)場(chǎng)的灰塵、水會(huì)影響變頻器的長(zhǎng)久運(yùn)行。

? ? 16、單相電動(dòng)機(jī)不適用變頻器驅(qū)動(dòng)。

? ? 17、如果變頻器的供電電源是自備電源，最好加上進(jìn)線電抗器。

? ? 18、電機(jī)負(fù)載非常輕時(shí)，即使電機(jī)負(fù)載電流在變頻器額定電流之內(nèi)，亦不能使用比電機(jī)容量小很多的變頻器。這是因?yàn)殡姍C(jī)的電抗隨電機(jī)的容量而不同，即使電機(jī)負(fù)載相同，電機(jī)容量越大其脈動(dòng)電流值也越大，因而有可能超過(guò)變頻器的電流容許值。

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