IC693MDL654
IC693MDL654
使用热继电器对电动机进行过载保护时，将热元件与电动机的定子绕组串联，将热继电器的常闭触头串联在交流接触器的电磁线圈的控制电路中，并调节整定电流调节旋钮，使人字形拨杆与推杆相距一适当距离。当电动机正常工作时，通过热元件的电流即为电动机的额定电流，热元件发热，双金属片受热后弯曲，使推杆刚好与人字形拨杆接触，而又不能推动人字形拨杆。常闭触头处于闭合状态，交流接触器保持吸合，电动机正常运行。
若电动机出现过载情况，绕组中电流增大，通过热继电器元件中的电流增大使双金属片温度升得更高，弯曲程度加大，推动人字形拨杆，人字形拨杆推动常闭触头，使触头断开而断开交流接触器线圈电路，使接触器释放、切断电动机的电源，电动机停车而得到保护。
IC693MDL654
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