西门子模块7MH4702-8CA

7MH4702-8CA

在对VFD进行故障排除时，请从维护清单中的基本预防措施开始。以下是组织良好的预防性维护计划的必要步骤：

　　目视检查整个变频驱动系统： 检查VFD附近是否有任何形式的滴水，极端温度，流水，碎屑，高湿度或腐蚀剂。

　　检查电源线连接，确保它们紧密且连接良好： 不良的导线连接是危险的，因为它们在破坏IGBT、过流跳闸、输入整流器故障以及接触器和开关连接器烧毁方面起着重要作用。

　　检查输入的线路电流和电压量： 良好的输入三相交流电的偏差不应超过 5%。不平衡的线路电压是影响VFD的挑战，例如由线路浪涌和骤降引起的过压和欠压跳闸。确保输入电流也达到建议的量，以保护VFD免受高启动电流和过流故障的影响。

　　检查驱动器的输出电流和电压： 对于大多数变频驱动器，在运行电动机之前，将来自逆变器的输出电压平衡到指定的体积。电流和电压的较大偏差会使电机出现问题，例如频繁摇晃或振动。电机问题也是导致VFD故障的原因。

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