1. There is a problem with an inverter, it cannot operate and the LED shows "UV" (abbreviation of under voltage), which clarifies that the alarm in the book is under voltage of the DC bus. Because the power supply of the control loop of this type of inverter is not taken from the DC bus, but from the AC input through the transformer alone rectification of the control power supply. Therefore, it should be true to determine that the police should be called. Therefore, check from the power supply, the input power supply voltage is correct, and the filter capacitor voltage is 0 volts. Since the short-circuit contactor of the charging resistor does not operate, it has nothing to do with the rectifier bridge. The scale of the problem is reduced to the charging resistance, and after the power is off, it is found that the charging resistance is broken by a multimeter. The replacement resistor was repaired right away.
2. After using a Sanken IF 11Kw inverter for more than 3 years, "AL5" (the abbreviation of alarm 5) occasionally appears when it is powered on, which states that the CPU is interfered with in the book. After many investigations, it was found that it was presented when the charging resistor was short-circuited and the contactor was in action. It is suspected that the interference caused by the contactor is no longer the result after adding resistance and capacitance filtering to the control foot.
3. A Fujifilm E9 series 3.7 kW inverter suddenly presents OC3 (constant speed medium overcurrent) alarm shutdown during on-site operation, and OC1 (accelerated medium overcurrent) alarm shutdown after power failure. I first removed the wires from U, V, and W to the motor, and used a multimeter to measure the infinity of resistance between U, V, and W, and the no-load operation, the inverter did not alarm, and the output voltage was normal. You can start to conclude that there is no problem with the drive. It turned out that there was a joint in the middle of the motor cable, which was covered in the distribution duct of the pit with a woodblock block, and the insulating tape was aging, and the factory cleaned and sanitated with water, resulting in a short circuit in the output.
4. Sanken SVF303, showing "5", clarifying that "5" in the book indicates DC overvoltage. The voltage value is sampled by the DC bus (DC of about 530V) through the fire pressure and then blocked by the optocoupler, when the voltage exceeds the certain threshold, the optocoupler acts, giving the processor a high level. Overvoltage alarm, we can see whether the resistance changes, whether the optocoupler has a short circuit, etc.
Therefore, from the above examples, it is not difficult to see how important the alarm prompt of the inverter is to deal with the problem, and remind you to deal with the correct direction of the problem.
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