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The reason why the medium frequency furnace can not be started normally

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The reason why the medium frequency furnace can not be started normally

2019-11-18

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Why can't the medium frequency electric furnace start normally? Many people have called to inquire about this matter. Today, the manufacturer of medium frequency electric furnace equipment will give you a unified introduction:

I. if electric furnace equipment fault phenomenon: high DC current, low DC voltage and if voltage when starting, equipment sound dull overcurrent protection, analysis and treatment of the thyristor with one arm of the inverter bridge may be short circuited or open circuit, resulting in the operation of the three arm bridge of the inverter bridge.

II. Analysis and treatment of the fault phenomenon of if electric furnace equipment, such as large DC current, low DC voltage and abnormal if voltage during starting, use multimeter to find out the short-circuit capacitance and replace the short-circuit capacitance.

III. fault phenomenon of medium frequency electric furnace equipment when heavy load cold furnace starts, all electrical parameters and sound are normal, but the power cannot be raised, analysis and treatment of overcurrent protection.

1. The inverter converter angle of the energy-saving medium frequency electric furnace is too small. Use an oscilloscope to watch the converter angle of the inverter thyristor and adjust the converter angle to the appropriate value.

2. If the insulation resistance value of the furnace body of the energy-saving medium frequency electric furnace is low or short circuited, use a megger to detect the resistance value of the furnace body and eliminate the short circuit point of the furnace body.

3. If the resistance of charge steel to induction coil of energy-saving medium frequency electric furnace is low, use a megger to detect the resistance of charge to induction coil; if the resistance is low, rebuild the furnace.

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