There are many novices who are not familiar with the fake load when repairing the inverter, and the repair of the inverter saves many of their modules with the false load, because the novice repairer generally does not know how to do this, and now the light is on to make it clear that the module is going to be broken. The false load is to use a resistor of several hundred ohms (a light bulb can also be used), string it on the main circuit, if there is a fast melt, remove it, and install the resistor; If there is no fast melting, it can be disconnected anywhere on the main return, and the resistor can be strung on it! This resistor has a current limiting effect, and when the module has a short circuit, the module will not be burned off, and the output of the measurement inverter is normal after starting, and then the false load will be removed!
However, there are also several problems to be paid attention to in the connection of false loads:
1. It should be connected between the capacitor and the module, not between the rectifier and the capacitor, because the capacitor discharge is enough to burn out the module.
2. When the switching power supply is fast-melting, you can't put the false load on the fast-melting, otherwise the bulb will be on after the power is sent, and the switching power supply sometimes does not work!
3. The false load should also be connected behind the DC voltage detection point, so that when the inverter output is not normal, the inverter will not jump "low voltage", so that you can see which output is faulty!
The inverter has a common feature, that is, if the switching power supply of the inverter is not directly supplied from the filter capacitor of the main circuit, but from the input end to the main circuit separately and independently supplied, if the power supply is 380V, then the best transformer into 220V (rectification) and then supply the switching power supply, although the inverter will be complicated, but its fault rate will be greatly reduced! Because a large part of the inverter is related to the switching power supply! When the inverter is running, the DC voltage of the main circuit is unstable many times, if the switching power supply is supplied from the filter capacitor of the main circuit, the switching power supply is easy to break! Schneider Electric Smart Building Days.
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