The most effective way for the failure of the medium frequency furnace is to use the low current experiment to judge whether it is the fault of the rectifier circuit or the fault of the inverter part. In the low current experiment, when the DC voltage is less than 513v, it indicates that there is a phase loss fault in the DC rectifier part. Check the specific thyristor fault, and the pulse breaking method should be used to judge whether it is the thyristor fault or there is no trigger pulse.

If the over rectifier circuit is normal. You judge whether the three axle arm operates according to the start-up. Over short circuit and open circuit of three axle arm operation package. Short circuit refers to the breakdown of inverter thyristor. Open circuit means that the inverter thyristor has an open circuit, that is, there is no trigger pulse. But it should also be said that the circuit breaker also has the circuit breaker of the medium frequency furnace load. It refers to the fault of medium frequency boiler water cable. Through the above steps, the fault of medium frequency furnace can be solved quickly.