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Types of inverter overcurrent faults


The overcurrent fault of the inverter can be divided into short circuit, light load, heavy load, acceleration, deceleration, and constant speed overcurrent. When analyzing the reasons for the overcurrent fault of the inverter, two aspects should be considered: one is the external cause; the other is the inverter its own reasons.


The three common types of overcurrent faults in frequency converters are as follows.


(1) When restarting, it trips as soon as the speed increases. This is a very serious phenomenon of overcurrent. The main reasons are that the mechanical parts of the load short-circuit are stuck, the inverter module is damaged, and the torque of the motor is too small.


(2) It jumps when it is powered on. This phenomenon generally cannot be reset. The main reasons are module damage, drive circuit damage, and current detection circuit damage.


(3) It does not trip immediately when restarting, but trips during acceleration. The main reasons are that the acceleration time setting is too short, the current upper limit setting is too small, and the torque compensation (V/F) setting is high.


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