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2.现场诊断现场布线情况,发现如下问题:PROFIBUS电缆与动力电缆未分开;功能地与保护地是否分开有待确认。通过观察变频器的PROFIBUS接口A、B信号的波形发现如下问题:
2. On-site diagnosis of site wiring and found the following questions: PROFIBUS cable and power cable are not separated; function and protection of the ground to be confirmed separately. By observing the waveform of the A and B signals of the PROFIBUS interface of the frequency converter, the following problems are found: