1. There is a problem with a frequency converter, it cannot operate and the LED shows "UV" (abbreviation of under voltage), which clarifies that the alarm in the book is DC bus undervoltage. Because the control loop power supply of this type of inverter is not taken from the DC bus, but from the communication input through the transformer separately rectified control power supply. Therefore, it is judged that the alarm should be real. So start with 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 scope of the fault is narrowed to the charging resistance, and after the power is off, it is found that the charging resistance is broken by a multimeter detection. The replacement resistor was repaired immediately.
2. After using a Sanken IF 11Kw inverter for more than 3 years, "AL5" (abbreviation of alarm 5) occasionally appears when it is powered on, which states that the CPU is disturbed in the book. Through multiple observations, it was found that it appeared when the charging resistor was short-circuited and the contactor was activated. It is suspected that the disturbance caused by the contactor is no longer blatantly faulty after the control foot is added to the resistor-capacitance filtering.
3. A Fujifilm E9 series 3.7 kilowatt inverter suddenly appears OC3 (constant speed medium overcurrent) alarm shutdown during on-site operation, and OC1 (accelerated medium overcurrent) alarm shutdown occurs when the power is powered off from the head. 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. It can be preliminarily determined that there is no problem with the inverter. 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 was cleaning and flooding, forming an output short circuit.
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 voltage division and then isolated by the optocoupler, when the voltage exceeds a 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.
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