注射冷(leng)水機主要用于成型模(mo)具的塑(su)料加工機械上。向模(mo)具中的流道內(nei)注入(ru)冷(leng)凍水，通(tong)過(guo)熱交換冷(leng)卻模(mo)具，保持溫度恒定，滿足生產過(guo)程的需要。在這個過(guo)程中，模(mo)具相當(dang)于一個熱交換器(qi)。

噴射式(shi)冷(leng)水(shui)(shui)機(ji)組反相故障主要(yao)是(shi)電源異(yi)常(chang)的(de)常(chang)見(jian)故障。主要(yao)有兩種原因:一是(shi)冷(leng)水(shui)(shui)機(ji)保護器(qi)損壞，二是(shi)冷(leng)水(shui)(shui)機(ji)電源缺(que)相或相序顛倒。

如(ru)何檢查電源保護(hu)器(qi)是否(fou)損壞。

在(zai)供(gong)(gong)(gong)電(dian)(dian)(dian)正(zheng)(zheng)常(chang)的情況下，關(guan)閉冷(leng)水(shui)機(ji)控制箱(xiang)的空氣(qi)開關(guan)。此時(shi)(shi)，冷(leng)水(shui)機(ji)組電(dian)(dian)(dian)源保(bao)護器上的指(zhi)示(shi)燈亮(liang)(liang)起。一般情況下，紅色表示(shi)供(gong)(gong)(gong)電(dian)(dian)(dian)，黃色表示(shi)正(zheng)(zheng)常(chang)供(gong)(gong)(gong)電(dian)(dian)(dian)。如(ru)果只(zhi)有紅燈亮(liang)(liang)，說明(ming)低溫冷(leng)水(shui)機(ji)電(dian)(dian)(dian)源缺電(dian)(dian)(dian)或順序(xu)不對。如(ru)果確認供(gong)(gong)(gong)電(dian)(dian)(dian)正(zheng)(zheng)常(chang)，但電(dian)(dian)(dian)源保(bao)護器指(zhi)示(shi)燈不亮(liang)(liang)，則說明(ming)電(dian)(dian)(dian)源保(bao)護器損壞。這時(shi)(shi)，就需要根據這些原因(yin)來判斷是失相還是相位反轉。可(ke)以找(zhao)出功率較小的相消除(chu)更換錯誤的序(xu)，或者更換冷(leng)水(shui)機(ji)的電(dian)(dian)(dian)源保(bao)護器。