6ES72411CH320XB0
6ES72411CH320XB0
6ES72411CH320XB0
6ES72411CH320XB0
6ES72411CH320XB0
2.6 有關(guān)變頻器與機(jī)械制動(dòng)的配合設(shè)置。一般設(shè)置好F8-19的頻率檢測值（FDT電平）即可，根據(jù)使用經(jīng)驗(yàn)，水平平移運(yùn)行機(jī)構(gòu)設(shè)置為2赫茲，提升機(jī)構(gòu)設(shè)置為4赫茲。需要指出的是，為安全可靠，提升機(jī)構(gòu)必須做靜載、動(dòng)載試驗(yàn)。靜載試驗(yàn)方法：吊起1.25倍的額定載荷，離開地面10～20公分，停車不應(yīng)該有溜鉤現(xiàn)象（此處指的是機(jī)械制動(dòng)動(dòng)作之前）；動(dòng)載試驗(yàn)方法：吊起1.10倍的額定載荷，離開地面10～20公分，停車穩(wěn)定后再提升時(shí)，不應(yīng)該有溜鉤現(xiàn)象。以上若有溜鉤現(xiàn)象，需要適當(dāng)提高FDT值，直到不溜鉤為止。同時(shí)以不溜鉤為前提，F(xiàn)DT值越小越好。以上試驗(yàn)反復(fù)三次合格為準(zhǔn)。該試驗(yàn)做好，能夠充分發(fā)揮變頻器的性能，同時(shí)也能避免溜鉤的安全事故。
該控制系統(tǒng)在天津天達(dá)公司的使用現(xiàn)場，，一次調(diào)試合格。得到用戶肯定。
3 變頻器在起重機(jī)控制應(yīng)用中的幾點(diǎn)體會(huì)
3.1 關(guān)于制動(dòng)組件的配置
提升機(jī)構(gòu)設(shè)置制動(dòng)組件是常識(shí)問題，往往不會(huì)出現(xiàn)問題。平移機(jī)構(gòu)是否設(shè)置制動(dòng)組件，常常被忽略，造成現(xiàn)場使用出現(xiàn)諸多問題。主要是三點(diǎn)，一是起重機(jī)的自重和起重量量大，停車慣性比較大，出現(xiàn)停機(jī)減速過電流故障；二是起重機(jī)在海邊或風(fēng)阻大的現(xiàn)場使用，出現(xiàn)恒速過電流或停機(jī)減速過電流故障；三是走行軌道不可能水平，在下坡運(yùn)行，出現(xiàn)恒速過電流或停機(jī)減速過電流故障。所以建議平移機(jī)構(gòu)的變頻器也必須設(shè)置制動(dòng)組件。匯川變頻器30KW以下均可以內(nèi)置制動(dòng)單元，只要配置制動(dòng)電阻就可。30KW以上的變頻器按照變頻器用戶手冊(cè)中的制動(dòng)組件選型表配置。
3.2 關(guān)于抗干擾問題
變頻器在起重機(jī)的控制中，如果沒有設(shè)備間同步的問題，調(diào)速以模擬量無級(jí)調(diào)速最好，調(diào)速平穩(wěn)，沖擊最小。但干擾源容易通過模擬量進(jìn)入控制系統(tǒng)，典型的現(xiàn)象是減速停機(jī)過程中出現(xiàn)頻率抖動(dòng)，造成起重機(jī)整體晃動(dòng)。解決的方法，將模擬量信號(hào)的屏蔽層由原接在PE端，改接在GND上，即可消除。請(qǐng)同行遇到該問題不妨一試。
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