跑(pao)偏(pian)(pian)傳(chuan)感(gan)(gan)器安裝在皮(pi)帶(dai)兩邊的支架上，正常時(shi)皮(pi)帶(dai)不(bu)接(jie)觸(chu)(chu)跑(pao)偏(pian)(pian)觸(chu)(chu)桿，傳(chuan)感(gan)(gan)器的兩接(jie)線(xian)端(duan)(duan)子不(bu)接(jie)通(tong)；當皮(pi)帶(dai)跑(pao)偏(pian)(pian)接(jie)觸(chu)(chu)到(dao)跑(pao)偏(pian)(pian)觸(chu)(chu)桿并推(tui)動(dong)觸(chu)(chu)桿偏(pian)(pian)離正常位置30°±3°時(shi)，傳(chuan)感(gan)(gan)器的兩接(jie)線(xian)端(duan)(duan)子接(jie)通(tong)。