ABB 48990001-NK
操作原理和應(yīng)用場合
CM系列熱敏電阻電機保護繼電器用于裝有PTC溫度傳感器的電機控制。PTC溫度傳感器與電機繞組-起測量電機發(fā)熱。這樣可直接監(jiān)視下列工作狀態(tài):
■重載啟動
■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
繼電器相對于電機額定電流、絕緣等級和起動方式是獨立的。
PTC與端子Ta和Tb串聯(lián)連接(或Ta和Tbx不帶短路測試)。每個測量回路可以接入的PTC傳感器的數(shù)量由每個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)定了自動復(fù)位功能，輸入繼電器會在冷卻之后自動動作。帶手動(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:
機械旋轉(zhuǎn)軸承
■熱風(fēng)通風(fēng)
■油
■氣
■供熱設(shè)備等
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