Reducing power consumption is also a key point reflected, because Taiwan imports power proportion of 99%, improve power efficiency, comprehensive development of power transformation is the absolute direction, in the future Schneider each new product will also buckle the two major tones of energy saving and intelligence, the words quite Schneider from the power expert identity and then include industrial control energy saving experts. Schneider inverter intelligent professional life.
The DC530V power supply is added to the starting end of the switching power supply oscillation chip through R133 and R134 at the moment of power-on to supply the starting current/voltage. Under normal working conditions, if you ignore the voltage drop between the 14th and 8th pins of the oscillation chip, it can be seen that R133 and R134 are actually C1*-C4* voltage equalizing resistors, but they are connected in parallel at both ends of C1*-C4*.
R104 and R103 are the starting circuits of the power supply/driver board switching power supply, which come from the slow charging branch of the capacitor during power-up. Its effect and principle are the same as those of R133 and R134, and will not be repeated.
In the normal state of R133 and R134, the J10 test point happens to be the midpoint of DC530V. And after powering on, the LCD display screen has relevant content, let us know that the terminal board is good, and the inverter is also powered on. If any component of R133 or R134 is broken, the inverter will not be visible after powering on.
In the normal state of R104 and R103, after powering on, the cooling fan gets the power supply of the switching power supply, and the wind is whistling, and the momentum is amazing. When it is broken, even if the LCD screen appears normal, the inverter is silent, silent, and quiet.
Take no obvious fault as an example: in the fault, if J10 is used as the reference voltage point, the voltage drop between C1 and C2 is measured, and it is found that the bias is severe and the voltage is uneven. For example, the voltage at both ends of C1 becomes 230V, and the voltage at both ends of C2 becomes 300V, but it is good to measure the "first group of voltage equalization resistances" R138 and R137. In the measurement of the "second level of voltage equalization resistance" R133 and R134, it was found that the resistance value of R134 was obviously larger. Replacing R134 not only shows normal, but also measures the voltage at both ends of C1 and C2, and the voltage is also equalized.
It can be seen that the three groups of voltage equalization voltages, any one of which is bad, will form a bias of about 60V at both ends of C1 and C2; Among them, R133, R134, or R104, R103 will be broken, and at the same time, the power supply/driver board or terminal board/panel circuit will be malfunctioned - loss of working power supply.
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