It is generally caused by the thinness of the green 1 ton induction melting furnace lining. After the lining is thinned, the equivalent impedance is reduced, and the power cabinet will be operated with a limited current. For a normal smelting system, the current limiting operation occurs at the beginning of the smelting and the metal in the furnace is almost full, and the current limiting operation time is generally It accounts for about 50% of the total melting time. If the equivalent impedance of the electric furnace is too small, the output voltage is relatively low when the current is limited. The current regulator on the main board cannot work very stably. If there is disturbance (such as feeding), the output current will fluctuate more than Protect the upper limit, causing overcurrent protection. Normally, the thickness of the lining can be judged by weighing the weight of each furnace. For a KGPS thyristor intermediate frequency furnace, if the molten metal of a furnace is greater than 1.3 times its rated capacity, the lining should be replaced.
Inverter thyristor water-cooled jacket has a reduced water or heat dissipation effect - replace the water-cooled jacket. Sometimes it is sufficient to observe the water output and pressure of the water jacket, but often due to water quality problems, a layer of scale is attached to the wall of the water jacket, because the scale is an object with poor thermal conductivity, although there is enough water flow. However, because the segregation of scale is greatly reduced in its heat dissipation effect. The method of judging is: running the power at a power lower than the overcurrent value for about ten minutes, stopping quickly, and quickly touching the core of the thyristor component by hand after stopping, if the hand feels hot, the fault is caused by Caused by this.
1 ton induction melting furnace The connecting line of the tank has poor contact and disconnection - check the connecting line of the tank, and handle it according to the actual situation. When the connection line of the tank circuit has poor contact or disconnection, the fire will rise after a certain value rises, which will affect the normal operation of the equipment and cause the equipment to protect. Sometimes a transient overvoltage occurs across the thyristor due to a fire. If the overvoltage protection action is too late, the thyristor component will burn out. This phenomenon often occurs when overvoltage and overcurrent occur simultaneously.
