Daily Maintenance of Medium-Frequency Induction Furnaces and Power Supply Care

Sep 03,2020

Weifang Kanda Electric Furnace Co., Ltd. We specialize in the manufacture of steel-shell furnaces, medium-frequency induction melting furnaces, medium-frequency power supplies, medium-frequency quenching furnaces, closed cooling towers, and medium-frequency commissioning production lines, among other equipment. Our products have an extremely low failure rate. Today, Kangda’s editor will analyze some common faults found in medium-frequency induction furnaces.
When repairing a medium-frequency heating furnace, the first thing we need to understand is what types of power sources the furnace can use: The first type is a medium-frequency generator set; the second is a thyristor-based static frequency converter; and the third is a frequency multiplier.
After confirming the power supply, the most important step is to test the power supply section of the board and check whether the circuit board’s power stage is functioning properly. Typically, power supply failures will show some signs of damage or degradation in the integrated circuits. Even if the power supply section of the intermediate-frequency heating furnace appears to be fine, don’t let your guard down—be sure to also inspect the rectifier section to ensure it’s operating normally. To do this, examine the output waveform: specifically, check whether the phase shift between the waveforms is within the expected range of approximately 120 degrees, and verify that the pulse width and spacing are consistent with the specifications. In this way, you can use an oscilloscope to measure the current and confirm whether each channel is operating as it should.
Generally, manufacturers who have used medium-frequency induction furnaces are well aware that when such furnaces break down, the control panel is often the component that suffers damage. And if the control panel of a medium-frequency induction furnace isn't repaired properly, it can lead to secondary damage. Over time, this cumulative effect can easily render the entire medium-frequency induction furnace unusable. Therefore, to ensure the long-term, trouble-free operation of a medium-frequency induction furnace, repairing the control panel thoroughly becomes a top priority. In fact, when we repair medium-frequency induction furnaces, paying close attention to just three small details can significantly reduce the likelihood of damage occurring in the first place.