描述
DSQC663 3HAC029818-001/08
要彻底排除电气故障，必须清楚故障发生的原因，要迅速查明故障原因，除不断在工作中积累经验外，更重要的是能从理论上分析、解释产生故障的原因，即“知其然，还要知其所以然”，用理论指导自己的操作，灵活运用排队故障的各种方法。专业理论知识很多电气现象，必须领先专业理论知识才能真正弄懂、弄通。维修电工与其他工种比较而言，理论性更强，有时候没有理论的指导，很多工作根本无法进行。实际工作中，往往动脑筋的时间比动手的时间还长，一但找出故障点，修复是比较简单的。
了解设备的运动形式对电气提出的要求，弄懂并熟练掌握设备的电气工作原理，熟练掌握电气工作原理，并比较该设备的电气控制特点，是排除故障非常重要的基础。熟悉掌握设备复合控制系统和电气控制技术的主要内容，了解其典型性、综合性与复杂性。了解各电气元件在设备的具体位置及线路的布局实现电气原理图与实际配线的一一对应，是提高故障排除速度的基础。做到这一点，可以对设备有一个进一步的了解，并且在排除故障测量时，能选择有效的测试点，防止误判断，以迅速判断、缩小故障范围。有了一定的理论基础，掌握了设备的工作原理，为排除故障做好了充分的准备，操作对有效的进行分析和找出故障点，还需具备一定的手段，这就是排除故障的一般方法。电阻法通常是指利用万用表的电阻挡，测量线路、触点等是否通断的一种方法，有时也用万用表或电桥测量线圈的阻值是否符合标称值，也用兆欧表测量相与相、相与地之间的绝缘电阻等。测量时，要注意选择量程（一般测量通路时，选择较低档位）；要较表；要注意有没有其他回路，以免引起误判断；更要注意严禁带电测量，这是一种常用的方法。
电压法是指利用万用表相应的电压挡，测量电路中电压值的方法，通常测量时，有时测量电压、负载的电压（即两表笔间一直饮食负载，也有时测量开路电压，以判定线路是否正常。测量时要注意表的挡位，选择合适的量程，测量直流电时，要注意正负极性。这也是一种较常用的方法。电流法即通过测量线路中的电流是否符合正常值，以判定故障原因。弱电回路，常采用将电流表或万用表电流挡串接在电路中进行测量，强电回路，常利用钳形电流表检测。替换法在怀疑某个器件有故障、但不能确定，且有代用件时，可替换试验，看故障是否恢复。
短接法适用于低电压、小电流回路中，将情绪适中的点用粗导线短接进行试验的方法。（工控资料窝）但必须确定短接时不会造成短路和短接后的一但工作，不会造成危害。禁止带电短接，一般初学者不宜采用。
直接检查法在了解故障原因或根据经验经常出现故障几率较高、再就是一些特殊故障，可以直接检查所怀疑的故障点。
仪器测试法借助各种仪器仪表测量各种参数，如用示波器观察波形的变化，以便分析故障的原因。多用于弱电线路中。逐步排除法如有短路现象出现时，可逐步切除部分线路以确定故障范围和故障点。
调整参数法有些线路中元器件无损坏，线路接线良好，只是由于某些物理量（如时间、位移、电流、电阻值、温度反馈信号强弱等）调整的不合适，而使系统不能正常工作，这时应根据电气工作原路及设备的具体情况进行调整。比较、分析、判断法它是根据系统的工作原理、控制环节的动作程序以及它们之间的逻辑关系，结合故障现象，进行比较、分析和判断，减少测量、检查等环节，迅速判断故障范围。
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