生物安全柜维修故障分析（型号：BHC-1800ⅡA2）

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                    <section><section powered-by="gulangu"><section><section><p><img src="image/20201019/0efb32474ae30a2302bd71feb0f7eb84_1.gif" /></p></section></section></section><section powered-by="gulangu"><section><section><p>故障现象</p></section><p><img src="image/20201019/5c2f2ee1949ca7d8633943de333c07f9_2.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;在设备一接上220V，打开控制面板上的电源键，柜箱内的日光灯就一直亮，无法通过控制面板上的开关控制。</p></section></section></section><section powered-by="gulangu"><section><section><p>故障分析及处理</p></section><p><img src="image/20201019/5c2f2ee1949ca7d8633943de333c07f9_2.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>1、根据故障现象，首先考虑控制面板上的触碰开关是否一直处于导通状态。经检测，按键正常。</p><p>2、根据该设备的控制原理，当按下日光灯按键时，MCU的某一个输出脚输出低电平，进而相应的继电器得电吸合，使负载处于得电状态，进而进行工作。拆下生物安全柜的控制板的外壳，拆开控制板状态，发现其进电正常。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/e53dd4adbc7622c8493134f4604ad70a_4.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>3、在通电过程中，分别对各功能进行测试，当测试日光灯时，发现相应的继电器没有吸合声音，初步判断控制日光灯的继电器有损坏。</p><p>4、拆下整个控制板，分别对继电器进行检测，发现控制日光灯的继电器一直处于导通状态，这说明该继电器已损坏，进行更换后，故障排除。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/aa79a7e34f085c51f5747fa98dc2eead_5.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/6051eed1fd4049dfdf3c9abce58fd260_6.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>故障诊断结果</p></section><p><img src="image/20201019/5c2f2ee1949ca7d8633943de333c07f9_2.png" /></p> <section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;该设备控制日光灯的继电器击穿一直处于导通状态，导致无法控制。</p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p>欢</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>迎</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>关</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>注</p></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p><img src="image/20201019/b438ddea8f97fb78e52cf29dec222154_8.jpg" /></p></section></section></section></section><section><section powered-by="gulangu"><section><section></section></section></section></section><section><section powered-by="gulangu"><section><section><p>关注我们</p><p>一起涨姿势！</p></section></section></section></section></section></section></section>