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配电柜中以温度为原则的控制电路

文章出处:人气:26发表(biao)时间:2021-10-24 10:00:57

配(pei)电(dian)(dian)(dian)柜中会用到以温(wen)度(du)为(wei)原则(ze)的控(kong)制电(dian)(dian)(dian)路(lu)(lu),一般会配(pei)合(he)电(dian)(dian)(dian)阻加热器(qi)来完(wan)成(cheng)整个电(dian)(dian)(dian)路(lu)(lu)控(kong)制。以温(wen)度(du)控(kong)制为(wei)原则(ze)的电(dian)(dian)(dian)路(lu)(lu)主电(dian)(dian)(dian)路(lu)(lu)中的用电(dian)(dian)(dian)器(qi)工作状态(tai)由温(wen)度(du)决定(ding)。图中所示电(dian)(dian)(dian)路(lu)(lu)就是有温(wen)度(du)控(kong)制的电(dian)(dian)(dian)阻加热器(qi)电(dian)(dian)(dian)路(lu)(lu)。

从图中所示(shi)电(dian)(dian)路可见(jian),主电(dian)(dian)路中的用电(dian)(dian)器是电(dian)(dian)阻(zu)加(jia)热器(RT)。电(dian)(dian)阻(zu)加(jia)热器是通过TR整(zheng)流变(bian)压(ya)器和桥式整(zheng)流电(dian)(dian)路供给直(zhi)流电(dian)(dian)。而整(zheng)流变(bian)压(ya)器的电(dian)(dian)源为(wei)单相(xiang)220V交流电(dian)(dian)。

配电柜以温度原则控制电路.jpg

主电路(lu)中(zhong)图中(zhong)多地点控(kong)制三相异步电动(dong)还有(you)刀开(kai)关(guan)QK和(he)短路(lu)保(bao)护(hu)元(yuan)件(jian)(熔断(duan)器 IFU),辅(fu)助电路(lu)是由(you)短路(lu)保(bao)护(hu)元(yuan)件(jian)熔断(duan)器2FU、转(zhuan)换开(kai)关(guan)QC、支流(liu)接(jie)触器KM和(he)温(wen)度(du)继电器KS组成。辅(fu)助电路(lu)的(de)KM交(jiao)流(liu)接(jie)触器控(kong)制电阻加(jia)热器的(de)通断(duan)电。

电路工作过程如下所述:当QK闭合后,电路接通电源,接着拧转QC,使之闭合,则KM得电动作,KM常开触点闭合,电阻加热 IFU器通以直流电流开始加热。

当(dang)被加热(re)(re)的(de)空间或物料温(wen)(wen)度(du)(du)达到预(yu)定温(wen)(wen)度(du)(du)时,感温(wen)(wen)元(yuan)(yuan)(yuan)件会将(jiang)KM回温(wen)(wen)度(du)(du)传(chuan)道给温(wen)(wen)度(du)(du)控(kong)制(zhi)元(yuan)(yuan)(yuan)件(温(wen)(wen)度(du)(du)继电(dian)(dian)器(qi)(qi)),则RT温(wen)(wen)度(du)(du)控(kong)制(zhi)元(yuan)(yuan)(yuan)件动(dong)作(zuo),使其常(chang)闭触点断开,使KM失电(dian)(dian),KM常(chang)开动(dong)合触点断开,则电(dian)(dian)阻加热(re)(re)器(qi)(qi)断电(dian)(dian),停止加热(re)(re),当(dang)被加热(re)(re)的(de)空间或物料温(wen)(wen)度(du)(du)低于某值(zhi)时(温(wen)(wen)控(kong)元(yuan)(yuan)(yuan)件设定的(de)低温(wen)(wen)温(wen)(wen)度(du)(du)),则温(wen)(wen)控(kong)元(yuan)(yuan)(yuan)件常(chang)闭触点自动(dong)闭合,KM得(de)电(dian)(dian)动(dong)作(zuo),电(dian)(dian)阻加热(re)(re)器(qi)(qi)重(zhong)新(xin)通(tong)电(dian)(dian)加热(re)(re)。

电(dian)阻加热(re)器(qi)在(zai)温控元件(jian)控制(zhi)下可(ke)以进行上述工作过程。若要(yao)想使电(dian)阻加热(re)器(qi)停止(zhi)加热(re),可(ke)以将转换开关拧(ning)回到原始断开状态(tai)即(ji)可(ke),


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