With the development of industrial automation, frequency converters have become a very popular control equipment in the electrical automation industry and have penetrated into almost every corner of the electrical automation industry. For novices, inverters may still feel unfamiliar. If the frequency converter fails, there is nothing you can do. Based on years of experience in the electrical industry, we have summarized several common faults of frequency converters and related solutions to share with everyone for learning and exchange.
1. Overcurrent short circuit
a. Overcurrent and short circuit are the most common situations when the inverter fails. When the frequency converter is started, if the frequency converter speed is increased, the frequency converter will alarm and display the fault code. This shows that the overcurrent is very serious. Most of the cases are caused by load short circuit, stuck mechanical and other components, soft breakdown or damage of the inverter module, and too short acceleration time.
b. The inverter starts to report a fault when it is powered on, and the fault cannot be eliminated even by pressing "Reset". It may be caused by damage to the internal drive component circuit of the inverter, damage to the current detection circuit, etc.
c. When the inverter is powered on, there may be a short delay, which will directly cause the upper circuit breaker to trip. At the same time, there will be an explosion or sparks inside the machine, indicating that the rectifier unit, power inverter components and other components of the inverter have been broken down. .
2. Overvoltage
Overvoltage fault is also the most common frequency converter fault. In addition to ruling out that the power supply voltage is too high, there is another situation where this situation will occur, which is when the inverter is shut down; the reason may be that the deceleration time is too short, or the braking resistor and braking unit There were related issues.
3. Undervoltage
Most popular understandings are that overvoltage means the voltage is too high, and undervoltage means the voltage is too low. During the operation of the equipment, in addition to the low power supply voltage, there are several reasons that may cause undervoltage: a. The power supply is missing a phase, b. The filter electrolytic capacitor capacity in the main circuit becomes smaller, c. There is a problem with the voltage detection circuit. , d. Open-circuit fault of the rectifier circuit; the above situations will also cause under-voltage of the inverter.
4. High temperature environment
High temperature is also a common fault that causes inverter failure.
a. The working environment temperature of the frequency converter is too high
b. The air outlet is blocked and the surrounding dust is not cleaned in time.
c. The heat sink fins and cooling fan are damaged
d. The temperature sensor and temperature detection circuit are damaged
Through the analysis of the above situations, in actual production, in order for the inverter to run smoothly, it still requires more daily maintenance, more inspections, diligent thinking, more hands-on use, and flexible use to make corresponding adjustments according to the site. achieve the optimal solution.
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