Electric instrument failure analysis <br> <br> Symptom: After the device starts, transfer power button has been screwed to the end, but each instrument indicated value is still small, the device does not work properly.
Check: According to the fault phenomenon, it can be determined that the fault range is in the rectification part of the device. Using the oscilloscope to detect the DC voltage waveform output from the rectifier bridge, it can be found that the conduction of a rectifier thyristor is not very good, but no abnormality is detected in the detection of the voltage waveform at each end of each thyristor. The replacement method is used (the rectifier bridge is replaced by the thyristor one by one). After the central thyristors were removed one by one, the faulty component was found to be a phase A rectifier thyristor.
Analysis: For some complex faults caused by poor electrical components, due to the limited instruments used in the inspection and other conditions, it is not easy to carry out accurate detection. The alternative method and the elimination method are simple and effective, and are common methods for eliminating such failures.
Check: According to the fault phenomenon, it can be determined that the fault range is in the rectification part of the device. Using the oscilloscope to detect the DC voltage waveform output from the rectifier bridge, it can be found that the conduction of a rectifier thyristor is not very good, but no abnormality is detected in the detection of the voltage waveform at each end of each thyristor. The replacement method is used (the rectifier bridge is replaced by the thyristor one by one). After the central thyristors were removed one by one, the faulty component was found to be a phase A rectifier thyristor.
Analysis: For some complex faults caused by poor electrical components, due to the limited instruments used in the inspection and other conditions, it is not easy to carry out accurate detection. The alternative method and the elimination method are simple and effective, and are common methods for eliminating such failures.
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