6SE6430-2AD38-8FA0西门子变频器

6SE6430-2AD38-8FA0

6SE6430-2AD38-8FA0

变压器直流电正负极有以下标记形状、标记颜色、直流表指针偏转三个区别，可以进行辨别：

　　1、标记形状不同变压器的正负极有明显的标记可以供区分。变压器正极的标记形状比较突出，变压器负极的形状则扁平。

　　2、标记颜色不同变压器的正负极也用红色和黑色区分。变压器的红端为正，变压器的黑端为负极。

　　3、直流表指针偏转不同如果只有两根引出线没有清晰的标记，只能用电流表来确定。变压器直流的两极（串联大电阻以防止电流表烧坏）连接到电流表的两端，直流电源的正极在指针偏转的一侧。

　　普通直流电机的正负极如果电源接反了，只要接入的电压在额定电压范国内是不会烧坏的。（比如玩具电机）直流电机的绕组都是由铜线绕制而成，接入直流后，绕组就相当于一个电阻，而我们都知道电阻是没有方向性的，所以电机也不会烧坏。

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