The illumination of the OP light is actually a self-protection mechanism of the medium-frequency electric furnace’s control system. When the system detects an overcurrent in the electric furnace, it will automatically activate overcurrent protection and cut off the power supply to prevent damage to the furnace body and the control system. At the same time, the OP indicator light will turn on to alert the operator that a fault has occurred.
If the electrodes are deviated or broken, it will cause unstable electric arcs and result in transient overcurrent. This is one of the common causes of OP protection activation.
If there are metal conductors on the furnace lining or the material surface, it may cause a short circuit between the coil and the furnace body, thereby triggering the overcurrent protection.
The control system of the medium-frequency electric furnace itself may also malfunction, such as damage to the control board or software abnormalities, leading to the false triggering of overcurrent protection.
Faults or aging of the parallel capacitor assembly in the medium-frequency electric furnace may also cause overcurrent.
Voltage fluctuations or excessively high harmonic content in the grid power supply system may also trigger the OP protection action.
First, immediately stop the operation of the electric furnace and cut off the power supply to prevent the fault from worsening.
Check the reading of various parameters in the control system, including current, voltage, power, etc., to initially determine the cause of the fault.
Based on the parameter readings, check each component that may cause the OP fault one by one, such as electrodes, furnace lining, parallel capacitors, and power supply system, to find the fault source.
Once the faulty component is identified, it is necessary to repair or replace it, and reset and re-commission the control system.
Before restarting the electric furnace, check and optimize various process parameters to ensure good operating conditions.
For each OP fault, detailed records of the fault phenomenon, cause, and handling process should be kept to provide a basis for future fault diagnosis and prevention.
In conclusion, the illumination of the OP fault light on a medium-frequency electric furnace indicates that the furnace has a serious overcurrent fault, which requires high attention from the operator and prompt measures. Only by promptly and accurately identifying the cause of the fault and taking targeted maintenance or adjustments can the safe and stable operation of the electric furnace be ensured.
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