ABB 48990001-NK
操作原理和應(yīng)用場(chǎng)合
CM系列熱敏電阻電機(jī)保護(hù)繼電器用于裝有PTC溫度傳感器的電機(jī)控制。PTC溫度傳感器與電機(jī)繞組-起測(cè)量電機(jī)發(fā)熱。這樣可直接監(jiān)視下列工作狀態(tài):
■重載啟動(dòng)
■增加開關(guān)頻率
■單相操作
■高環(huán)境溫度
■冷卻不充分
■中斷操作
■不平衡
繼電器相對(duì)于電機(jī)額定電流、絕緣等級(jí)和起動(dòng)方式是獨(dú)立的。
PTC與端子Ta和Tb串聯(lián)連接(或Ta和Tbx不帶短路測(cè)試)。每個(gè)測(cè)量回路可以接入的PTC傳感器的數(shù)量由每個(gè)PTC傳感器的電阻的總和限定。RG=R1 +R2+ RN≤1.5K 2
在額定操作條件下電阻低于響應(yīng)閾值。只要有一個(gè)PTC電阻發(fā)熱超
出閾值，輸出繼電器復(fù)位。
如果設(shè)定了自動(dòng)復(fù)位功能，輸入繼電器會(huì)在冷卻之后自動(dòng)動(dòng)作。帶手動(dòng)(前而板按鈕)或遠(yuǎn)程復(fù)位功能的器件必須通過控制輸入信號(hào)控制。
其它應(yīng)用范圍
集成PTC傳感器的設(shè)備的溫度監(jiān)視:
機(jī)械旋轉(zhuǎn)軸承
■熱風(fēng)通風(fēng)
■油
■氣
■供熱設(shè)備等
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