Analysis of the soft fault in the inverter Xiaobian wants to tell everyone that when using the inverter, there are often some inexplicable problems. For example, after the inverter fails, the equipment maintenance personnel go to the site to turn off the power supply to the inverter and then send power. The inverter can run normally again, but after a period of operation, the fault will appear again. After replacing the new inverter, this kind of fault will still occur. What is the reason? The following is a small series for everyone to explain the treatment of soft faults in the inverter.
Converter board
One thing to note here is that this kind of fault will occur after replacing the new inverter. This indicates that it is not a problem of the inverter itself. The cause of the fault should be caused by the use environment or improper use. Xiao Bian believes that the following points should be emphasized:
Whether the signal line and the control line have a shielded line view. If the shielded signal line is not selected, it should be replaced with a shielded line view, and the shielded line should be well grounded. The reason for this is mainly to prevent some interference. signal. Whether the signal line and the control line are placed in the same cable trench or bridge frame as the power line. If the signal line and the control line and the power line are placed in the same cable trench or bridge, the signal line and the power line should be separately routed.
Shield line in the inverter
The control signal signal transmitted by the host computer to the inverter is a voltage signal or a current signal. For long-distance transmission, if a voltage signal is used, the transmission signal will be attenuated to some extent during transmission, resulting in transmission to the inverter. The signal is unstable, so for the signal transmitted over a long distance, the current signal should be selected mainly, because the current signal is not easy to be attenuated and is not easily interfered. In practical applications, the signal output by the sensor is a voltage signal, at which point we can convert the voltage signal into a current signal through the converter. This ensures that the control signals transmitted to the frequency converter are not attenuated and are not susceptible to interference from other signals.
Inverter wiring diagram
In addition, check the control signal line of the inverter to pass the magnetic ring. If not, add a magnetic ring to the control signal line of the inverter to reduce the interference of the interference signal to the inverter.
Xiao Bian believes that after taking the above measures about the soft fault in the inverter, the power can be normally operated after the power is turned off. The fault occurs repeatedly after running for a period of time, and the fault that can be operated after the power is turned off can basically be solved.
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