Due to the significant advantages of BB inverters in speed regulation and energy saving, Wuxi Jincheng Electric's products are increasingly using inverters for variable frequency speed regulation. This article will briefly explain the repair and maintenance of BB inverters. . How to select the capacity of the inverter when a BB inverter is equipped with multiple motors?
In principle, it is not recommended to use one frequency converter to drive multiple motors. If you use one frequency converter to drive multiple motors in parallel, please make the sum of the motor's rated capacity less than the rated output current of the frequency converter and leave a margin.
How to solve the problem of high harmonics?
The diode rectifier circuit will produce high-order harmonics of 1 and 3 times. It will cause the current to increase, the power factor to decrease, etc., which will not have much impact on the circuit under low power conditions, and generally no special measures need to be taken. When the motor power is large, a reactance capacitor (about 3 voltage drop) can be installed.
What are the requirements for the input side transformer of the frequency converter?
When installing large-capacity equipment, please confirm the transformer impedance value in advance and whether the transformer capacity is appropriate. In addition, in the following three cases, please install a reactor on the input side of the inverter.
Especially when small-capacity inverters and large-capacity inverters are installed in the same place, pay attention to the following three points:
When the transformer capacity exceeds
When the distance between the transformer and the inverter is less than /> When the input current value is greater than the rated output current value of the frequency converter
The smaller the power grid inductance, the greater the high-order harmonic current will be, and may even cause damage to the rectifier bridge of the frequency converter.
How to solve the voltage imbalance problem?
Sometimes a small voltage imbalance can cause a serious current imbalance or even phase loss. It can cause damage to the rectifier bridge and damage to the electrolytic capacitor (due to the increase in pulsating current). If the current of a certain phase exceeds the rated output current of the frequency converter, a reactor must be installed. If current imbalance occurs at light load, the machine will not be damaged.
What are the requirements for input voltage fluctuation?
The general input voltage range is quite wide, so it can basically adapt to any area in the country. However, be sure to confirm the input voltage in advance during installation.
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