西门子7MH4710-5CA

7MH4710-5CA

容易出现故障，因此需要有效的故障排除技能来避免停机。排除任何VFD的故障都不是一件容易的事，特别是由于其结构中同时存在电子和电气组件。

　　变频器故障原因

　　在开始VFD故障排除过程之前，建议您熟悉其故障的一些常见原因，尤其是当您没有任何电力电子背景知识时。了解导致VFD故障的原因将是您确定挑战的实际来源的秘诀。话虽如此，让我们看一下导致VFD单元性能不一致或完全故障的内部和外部因素。

　　原因1：环境条件差

　　VFD的规格与普通计算机相似，因此容易受到任何形式的湿气，灰尘，碎屑过热和腐蚀剂的影响。以下是对可能缩短VFD寿命的几种环境条件的讨论。

　　污染物

　　保存在高碎屑、潮湿、灰尘等区域的 VFD 会遇到冷却通风口堵塞的情况，尤其是在污染物与油和润滑剂相互作用时。

　　请记住，通风口的目的是冷却VFD，当堵塞时，VFD会过热。在佳温度范围之外运行会导致寿命缩短。导电金属等污染物可能会在VFD的PCB中产生短路。为了这些污染物，VFD应至少每月清洁一次。对于过度污染，请完全环境中的VFD。

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