ABB觸摸屏開機黑屏無顯示原因分析維修電話

ABB觸摸屏無背光等維修.提供維修觸摸屏主板，觸摸屏液晶屏，觸摸屏液晶屏顯示，按鍵屏，操作面板，觸摸屏按鍵壞，操作面板按鍵壞，按鍵不靈，按鍵膜更換銷售，觸摸屏通電無反應維修，觸摸屏顯示故障，提供免費檢測服務。
常見故障有：黑(hei)屏、花屏、白(bai)屏、無背(bei)光(guang)(guang)、不(bu)(bu)能(neng)通信、按鍵(jian)無反(fan)應(ying)、按觸(chu)摸屏無反(fan)應(ying)或反(fan)應(ying)慢（觸(chu)摸不(bu)(bu)良）、內容錯亂、進不(bu)(bu)了系統界(jie)面、背(bei)光(guang)(guang)暗、有背(bei)光(guang)(guang)無字符、觸(chu)摸鏡片損壞(huai)、液晶屏損壞(huai)等

ABB觸摸屏開機黑屏無顯示原因分析維修電話采(cai)用變(bian)頻(pin)器運轉(zhuan)(zhuan)，隨著電(dian)(dian)(dian)機(ji)的加速相應(ying)提高頻(pin)率(lv)和電(dian)(dian)(dian)壓，起(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)(liu)被限制在150%額定(ding)電(dian)(dian)(dian)流(liu)(liu)以(yi)下(根(gen)據機(ji)種不同，為125%-200%)。用工頻(pin)電(dian)(dian)(dian)源直接起(qi)動(dong)(dong)(dong)時(shi)，起(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)(liu)為6-7倍(bei)，因(yin)此(ci)，將產生機(ji)械電(dian)(dian)(dian)氣(qi)上的沖(chong)擊。采(cai)用變(bian)頻(pin)器傳動(dong)(dong)(dong)可以(yi)平滑地(di)起(qi)動(dong)(dong)(dong)(起(qi)動(dong)(dong)(dong)時(shi)間變(bian)長)。起(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)(liu)為額定(ding)電(dian)(dian)(dian)流(liu)(liu)的1.2-1.5倍(bei)，起(qi)動(dong)(dong)(dong)轉(zhuan)(zhuan)矩(ju)為70%-120%額定(ding)轉(zhuan)(zhuan)矩(ju)；對於帶有(you)轉(zhuan)(zhuan)矩(ju)自動(dong)(dong)(dong)增強(qiang)功(gong)能的變(bian)頻(pin)器，起(qi)動(dong)(dong)(dong)轉(zhuan)(zhuan)矩(ju)為100%以(yi)上，可以(yi)帶全(quan)負載起(qi)動(dong)(dong)(dong)。

頻率下降時(shi)電壓V也成比例(li)下降，這個(ge)問題(ti)已在回答4說明。V與F的比例(li)關系是考慮了電機(ji)特(te)(te)性(xing)而預先決定的，通常在控(kong)制(zhi)器(qi)的存(cun)(cun)儲裝置(ROM)中(zhong)存(cun)(cun)有幾種特(te)(te)性(xing)，可以用開關或標度盤進行(xing)選擇。

頻率下降(jiang)時(shi)*成比例(li)地降(jiang)低(di)電(dian)壓，那麼由於交流(liu)阻(zu)抗變(bian)小而直流(liu)電(dian)阻(zu)不變(bian),將(jiang)造成在低(di)速下產生地轉矩有減小的(de)傾向。因此，在低(di)頻時(shi)給定V/F,要使(shi)輸(shu)出電(dian)壓提高一(yi)些(xie),以便獲得(de)一(yi)定地起(qi)動(dong)(dong)轉矩,這(zhe)種補(bu)償稱增強起(qi)動(dong)(dong)。可以采(cai)用各種方法(fa)實現,有自動(dong)(dong)進行的(de)方法(fa)、選擇V/F模式(shi)或調(diao)整(zheng)電(dian)位器(qi)等(deng)方法(fa)。