Kim loại lò nóng chảy can be started, and there is overcurrent when the power is increased. Common causes:

①The intermediate frequency transformer is damaged or defective,

②The inverter pulse transformer is damaged or defective,

③Inverter SCR soft breakdown or intermittent,

④Leakage of the primary series capacitor of the intermediate frequency transformer,

⑤The electric heating capacitor has soft breakdown, and the insulation of the furnace ring or copper bar is not well grounded or slightly short-circuited.