1) There is a thyristor breakdown or no operation in the intermediate frequency melting furnace rectifier bridge.
2) There is a thyristor breakdown or no operation in the inverter bridge of the intermediate frequency melting furnace.
3) There is a fast-melting damage in the intermediate frequency melting furnace rectifier bridge.
4) The intermediate frequency melting furnace is limited in pressure or current limiting.
Intermediate frequency melting furnace automatic trip or overcurrent protection - intermediate frequency melting furnace
Fault condition: When the intermediate frequency melting furnace is started, when the intermediate frequency start switch is turned on, the main circuit switch protects trip or overcurrent protection.
Analysis of the cause of the phenomenon:
1. Intermediate frequency melting furnace current regulator failure - When the current regulator circuit is faulty, especially when the current transformer is damaged or the wiring is open, the current feedback suppression is started, and the DC voltage will directly hit the maximum (Q angle 20 degrees). The DC current will directly hit the maximum value, causing overcurrent protection or tripping of the main circuit switch. Treatment method: Check whether the current transformer is damaged; whether the current transformer to the circuit board is disconnected; whether the current regulator part has component damage or open circuit.
2, the intermediate frequency melting furnace power adjustment knob in the highest position - in addition to the quenching load, other loads require the intermediate frequency melting furnace to put the power adjustment knob at the minimum position at the start, if it is no longer the minimum position, it will be too much because of the current impact Current protection or main circuit switch protection trips.
