1756-IB16D

1756-IB16D要檢測到電機故障，需要確定檢測電機什么故障，一般plc檢測電機故障也就是檢測一下電機運行電流，一般采用熱繼電器和變頻器來檢測電機，在控制電路中加入熱繼電器，或者采用變頻器監(jiān)控!

如果采用熱繼電器的話，我們一般需要將熱繼電器的輔助觸點接入plc的數字量輸入點，用于監(jiān)控電氣是否過載故障!因為熱繼電器可以設置電流，到了對應的電流到達時間，熱繼電器會斷開主回路，保護電機!至于plc程序里邊用開點還是閉點，要根據實際情況!

  我們以開點為例，當熱繼電器斷路以后，對應的輔助觸點開點會閉合，plc程序里邊的開點也會閉合，做程序時，坐上一個故障即可，電機過載故障!同理如果使用變頻器的話，將變頻器里邊的電機參數和現場使用的電機設置成一致的!

這樣電機過流以后變頻器會報警提示，一般采用變頻器里邊的繼電器輸出觸點，設置好對應的參數，讓該繼電器作為報警輸出使用，變頻器報警后，該繼電器就會輸出，至于接到plc的接線方法和編程思路和用熱繼電器一樣!

這是普通的電機，有的電機自帶驅動器，里邊有檢測電機故障的觸點，直接接到plc編程應用即可。

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