當皮(pi)(pi)帶跑偏時，由接近開關檢(jian)測皮(pi)(pi)帶左、右(you)偏離信號，送入PC裝置(zhi)(zhi)，經判斷處理后發出控制信號給(gei)校(xiao)偏機構使(shi)(shi)皮(pi)(pi)帶自(zi)動(dong)恢(hui)復(fu)至中(zhong)(zhong)間位置(zhi)(zhi)，若長時間校(xiao)偏仍(reng)不(bu)能(neng)使(shi)(shi)皮(pi)(pi)帶恢(hui)復(fu)到(dao)中(zhong)(zhong)間位置(zhi)(zhi)，則發出帶偏信號，提醒操(cao)作人員及(ji)時排除(chu)故障以(yi)校(xiao)正皮(pi)(pi)帶跑偏。