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If the rectifier circuit is normal
The most effective method for the failure of the intermediate frequency furnace is to use a small current experiment to judge whether the rectifier circuit is faulty or part of the inverter fault. When the DC current is less than 513 volts during the small current experiment, it indicates that the DC rectifier part has a phase loss fault. It is the thyristor fault, the method of breaking pulse should be used to judge whether the thyristor is faulty or there is no trigger pulse.
If the rectifier circuit is normal. You are based on the start to determine whether the three arms are running. The three-legged arm runs over short circuit and open circuit. Short circuit refers to the phenomenon that the inverter thyristor has breakdown. Open circuit means that the inverter thyristor has an open circuit, that is, there is no trigger pulse. But also to say, the open circuit also has an open circuit load of the intermediate frequency furnace. Refers to the failure of the intermediate frequency furnace water cable. Through the above steps, the intermediate frequency furnace failure can be quickly solved.