Fault Example 7
Fault phenomenon: when the equipment is running, the DC current has reached the rated value, but the DC voltage and intermediate frequency voltage are low. Observe the intermediate frequency voltage waveform with an oscilloscope, and the waveform is normal, and the front angle of the inverter is also normal.
Fault analysis and treatment: the fault phenomenon is not caused by the intermediate frequency power supply fault, but by the low impedance of the load, so it is necessary to readjust the load impedance.
A medium frequency furnace in the boost load circuit, due to the damage of series compensation capacitor, its removal, did not replace, or blindly require high power and uncontrolled increase of compensation capacitor, so that the load compensation over compensation, will cause this fault phenomenon. The solution is to readjust the compensation capacity of the compensation capacitor so that the equipment can operate at rated power.
B. the inductor has inter turn short circuit. If the inductor has the phenomenon of turn to turn short circuit, the impedance of the load will also be reduced. There are two possibilities of turn to turn short circuit: the copper tube of the inductor is directly short circuited; the fixed rubber column of the inductor is seriously carbonized. Due to the conductive characteristics of carbon, the fixed rubber column of the medium frequency induction furnace is directly connected between turns, resulting in turn to turn short circuit. The solution is to eliminate the phenomenon of inter turn short circuit.
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