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How to Perform Fault Diagnosis on Intermediate-Frequency Induction Furnaces—Identifying the Causes of Faults in Intermediate-Frequency Induction Furnaces
Aug 14,2020
Medium-frequency electric furnace Fault inspection
1. The standard for checking the forward and reverse resistance of an inverter thyristor is as follows: Under system-connected conditions, the forward and reverse resistances typically match the value of the externally connected resistor—5 kΩ. If the component is damaged, the resistance will drop to tens of ohms or even zero ohms.
2. Inspection of the insulation condition of the transformer in the inverter section: 380/10V, 10V, 10V, 10V transformers.
For a 4000/100V, 50V transformer, the insulation condition of each coil relative to the transformer’s enclosure must be tested using an insulation megger. The resistance value should approach infinity. Additionally, insulation tests must be performed between each pair of transformer windings; the resistance values here should also approach infinity and there must be no short circuits. A short circuit will definitely damage the thyristor.
3. Use the DC setting on a multimeter to test the pulse trigger boards, ensuring that each trigger board has a trigger pulse of approximately 2 volts.
4. Test the forward and reverse resistance of the thyristors in the rectifier section, and ensure that each thyristor in the rectifier section receives a trigger pulse.
5. Thoroughly check whether the output filter capacitor and the inverter capacitor have suffered breakdown by examining their physical deformation and measuring the resistance between the positive and negative terminals. Alternatively, you can use a dedicated capacitance meter. When performing the test, be sure to disconnect the capacitor’s terminal connections to ensure accurate results.
6. When replacing the circuit board, avoid causing self-induced faults. Carelessly connecting wires incorrectly can lead to even more serious malfunctions. As a general rule, take photos with your mobile phone before disassembling to keep a record.
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Kangda Electric Furnace specializes in the manufacture of the following equipment: KGCL series medium-frequency power supplies, KGPS series medium-frequency power supplies, GTR series medium-frequency induction heating furnaces...
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Address: Yuhe Industrial Park, Weicheng District, Weifang City, Shandong Province
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