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  • When the DC voltage rises to more than 500V, the DC voltage decreases.
  • 2018/1/6 number of times read:[865]
  • Fault phenomenon: startup and operation is normal. When DC voltage rises to 500V, DC voltage will decrease, fluctuate and even flow, sometimes burn fast.

    Fault analysis and processing: This is the problem of rectifying phase shift circuit.


    The zero line on the A. control board is unconnected. The synchronous signal circuit on the control board needs zero line. If it is lacking, the phase shift deviation will occur, and the conduction angle is more than 0 degrees, and the above phenomenon appears.


    B. users did not connect the zero line to the cabinet or the zero line.

    There is a problem in the W4 potentiometer (150 degrees) of the C. rectifying circuit. When the adjustment is excessive, the conduction angle is more than 0 degrees. When a given circuit on the front end of the control board has a problem, the conduction angle will also appear to be more than 0 degrees.

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