The lack of phase protection alarm occurs The possible reasons are: serious imbalance of three-phase power, lack of one phase of three-phase power supply, open circuit of air switch or power supply line, etc. 6. It is easy to jump (stop working suddenly), the speed of the workpiece entering and leaving the induction ring is too fast, the short circuit and ignition phenomenon exist between the workpiece and the induction ring or the induction ring itself, the gap between the workpiece and the induction ring is too small, and the shape and size of the self-made induction ring are incorrect.
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