如果指示灯没有点亮,模板可能损坏,或者LED指示灯被损坏.如果指示灯点亮,但输出设备没有运行,在接线端子上可以检测到电压值或电阻值。如果检测到的电压等级与当前的电压等级一致,请检查输出设备或与之相关的配线.如果输出模板的输出均不工作,可能是外部电源故障,可能没有送电或连接不正确。(输入和输出设备通过一-个外部电源提供电源,不由模板内部供电).如果输出模板安装有保险(某些模板用用短路保护取代了保险),保险的LED指示灯(标签为“F”),如上图所示,如果保险熔断该指示灯将点亮.
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