If the heating power of induction smelting furnace cannot be sent up, it can be investigated and dealt with from the following three situations.

1) The low power of the induction furnace works normally. When the power increases, the over-current or over-voltage protection action can be handled according to the following conditions:

① Whether the thyristor of the main circuit is aging or not, its current and voltage tolerance will decline.

② Whether the SCR resistance capacitance absorption circuit of the main circuit is in poor contact, damaged or broken.

③ Whether the turn to turn insulation of reactor and load inductor is good.

④ Whether the cooling water path is blocked, whether the water temperature is too high, and whether the water pressure is too low.

⑤ Whether the withstand voltage of load compensation capacitor decreases.

⑥ Whether the anti-interference performance of the control system declines (especially the SCR trigger circuit), because with the increase of intermediate frequency power, the interference will also increase, and the over-current or over-voltage protection may malfunction.

⑦ If the front trigger pin of the inverter circuit is too small, when the current rises, the over-current protection will act due to unsuccessful commutation.

⑧ Whether the SCR waveform of the main circuit is normal (whether the rectifier circuit output is lack of phase, whether the inverter circuit output is lack of phase).

⑨ Whether the ground insulation of the main circuit has dropped.

⑩ Whether the setting value of over-current voltage changes.

2) Both DC voltage and intermediate frequency voltage can send out rated value, while DC current is very low. When UD rises to the maximum value, rated intermediate frequency power can not be sent out, which can be handled according to the following conditions:

① The front foot of inverter trigger is not set properly.

② The matching between load inductor and compensation capacitor is improper, and the equivalent impedance of load current is too high.

Yiphee Electric Furnace Co.,Ltd specializes in producing induction furnace.Tel(WhatsApp):+86-13450756789, yiphee@yiphee.cn