Inverter is a very popular electric control equipment, almost penetrated into all corners of industrial production activities. But for a part of the new electrician industry or just started to contact the inverter people, it is still relatively unfamiliar and mysterious, especially once the inverter failure is easy to get busy and confused to start. Today, based on years of experience in the use and maintenance of inverters, I summarized the four common failures of inverters, and give the cause of the failure of the relevant causes.

I. Overcurrent (short circuit)

Overcurrent fault is the most common among various faults of inverter. The fault is mostly caused by the following problems.

First of all, as long as the speed of the inverter to report a fault when starting, indicating that the overcurrent is very serious, mostly caused by a short circuit in the load, mechanical parts jammed, inverter module soft breakdown damage and acceleration time is too short. Secondly, the inverter a power supply to report a fault, and can not "reset" to exclude, it is mostly because of the inverter internal drive circuit damage, current detection circuit damage caused by. The last phenomenon is the most extreme, the inverter in the moment of power or after a short delay, it will directly cause the upper level air open tripping at the same time the internal frying sound or sparks, the inverter rectifier unit, power inverter components and other direct breakdown caused by the fault.

Second, overvoltage

This fault phenomenon also often appears in the inverter failure. In addition to the exclusion of the supply voltage is too high, there is a situation in which this fault can also occur - when the inverter shutdown process. The main reason for this situation may be too short deceleration time or braking resistor and braking unit problems caused by.

Undervoltage

Corresponding to the above overvoltage fault is the inverter undervoltage fault, generally in addition to the exclusion of the power supply voltage is too low, there may be the following reasons: power shortage, rectifier circuit a bridge arm open circuit failure, the main circuit filter electrolytic capacitor capacity becomes small, or voltage detection circuit problems can also lead to the inverter undervoltage fault. In addition, if the internal slow-charging resistance of the inverter is not short-circuited, as long as the inverter starts with a load will also occur to report the undervoltage fault.

Fourth, overtemperature

Over-temperature is also a common fault of inverter, the fault is mostly caused by high temperature of inverter working environment, blocked cooling holes, damaged cooling fan, temperature sensor and temperature detection circuit damage, etc.

Through the above analysis of the four common faults of the inverter (of course, there are also overload, output imbalance and other faults), it is easy for you to see that the inverter to run smoothly and normally, but also need more efforts in the daily maintenance, and we need to actually use the site according to the situation to be flexible, as far as possible to prevent problems before they occur!

*** Translated with www.DeepL.com/Translator (free version) ***