IC697BEM711
IC697BEM711
IC697BEM711
本方案采用森蘭SB70G系列變頻器和西門(mén)子S7-200 PLC組成一套文化紙機(jī)傳動(dòng)控制系統(tǒng)。通過(guò)可編程邏輯控制器（PLC）和變頻器之間的通信，控制傳動(dòng)點(diǎn)的啟動(dòng)、停止、增速、減速、緊紙等操作，由軟件自動(dòng)實(shí)現(xiàn)負(fù)荷分配、速度鏈等功能，充分滿足造紙工藝及電控的需要。
1、紙機(jī)對(duì)電氣傳動(dòng)控制系統(tǒng)的要求
1．1 該機(jī)結(jié)構(gòu)簡(jiǎn)圖如圖4所示。紙機(jī)為1760/250m/min長(zhǎng)網(wǎng)多缸文化紙機(jī)，生產(chǎn)40～65g/m2高級(jí)文化用紙，穩(wěn)態(tài)精度≤0.01%。
圖4 結(jié)構(gòu)簡(jiǎn)圖
1.2 為了能生產(chǎn)出質(zhì)量標(biāo)準(zhǔn)較高的產(chǎn)品，紙機(jī)對(duì)電氣傳動(dòng)系統(tǒng)提出如下的要求：
（1） 紙機(jī)工作速度要有較大的調(diào)節(jié)范圍，調(diào)節(jié)范圍為1:8；
（2） 車(chē)速要有較高的穩(wěn)定裕度，總車(chē)速提升、下降要平穩(wěn)。要求紙機(jī)穩(wěn)速精度為±0.05～0.01%；
（3） 速差控制，速比可調(diào)、穩(wěn)定。速差在一定范圍內(nèi)變化不引起紙頁(yè)質(zhì)量的突變，誤差應(yīng)控制在0.1%以內(nèi)。紙機(jī)各分部的速度必須是可以調(diào)節(jié)的，為±10～15%。
（4） 各分部傳動(dòng)點(diǎn)具有速度微升、微降功能，同時(shí)在這些分部中，應(yīng)具有單動(dòng)、聯(lián)動(dòng)功能，并可以同時(shí)起動(dòng)、停止。
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