Inverter is an important drive material in modern industrial production, as a power equipment, it is working hard all the time, so its fault rate is very high, and the rapid processing of inverter faults, to ensure the continuity of industrial production, is the skill that every maintenance electrician and on-site commissioning electrical engineer should grasp. However, many people don't know why, and they are at a loss as to why the inverter has problems, and it will be unorganized to deal with it.
Overload is a momentary concept, which refers to the load exceeding a certain multiple of the rated load in successive moments.
The most important concept of overload is successive moments. For example, if an inverter is overloaded to 160% for one minute, it means that there is no problem if the load reaches 1.6 times the rated load for one minute in a row. If the load suddenly decreases at 59 seconds, the overload alarm will not be triggered. Only after 60 seconds will the overload alarm be triggered.
Overcurrent is a quantitative concept, which refers to how many times the load suddenly exceeds the rated load.
The moment of overcurrent is very short, and the multiple of excess is very large, generally more than ten or even dozens of times. For example, when the motor is working, the mechanical shaft suddenly stalls, then the current of the motor will rise rapidly in a short period of time, resulting in overcurrent problems.
For a more vivid picture, it can be described with a truck. For example, if you load a truck with a rated load of 10 tons and you load 16 tons of cargo, and after one minute on the road, the engine stalls, which is an overload. If you load 100 tons of cargo, then as soon as it starts, the engine stalls, which is overcurrent. Or if you load 10 tons of cargo and are traveling normally, and suddenly 100 tons of cargo fall from the sky and hit your car, then the engine will stop in a very short time.
Therefore, the overcurrent is caused by the sudden stalling of the machine, or the sudden excessive load. The overload is generally caused by the wear and tear of the machine part, or the poor lubrication, or the mechanical aging caused by improper maintenance.
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