Interpretation of the numerical control lathe fault and processing steps

CNC lathe shutdown failures:

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CNC lathe CNC numerical control lathe manufacturer to stop when they make a lot of sound, workshop of main power trip. First check workshop electrician to check the power supply system, the automatic air circuit breaker tripping where, due to the environmental humidity switch box, tripping linkage have been corrosion, moreover three-phase contact is only a small part of the contact can touch. Second, the small workshop power transformer capacity, the overload operation. The normal phase voltage is 340 v only. Finally, thyristor CNC lathe has been burnt, check the drive circuit, trigger pulse is short, only a quarter of the normal trigger pulse amplitude, further verify the trigger circuit amplifier tube performance is bad.

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failure analysis:

CNC numerical control lathe factory thyristor rectifier in a state of lack and inverter in the state of lack of phase results are different. In rectifier state always thyristor trigger potential is higher, at the same time make the previous phase thyristor inverting voltage and shut off. During thyristor turn-off is given priority to with reverse phase blocking state. Even after a thyristor trigger, and thyristor at a certain moment will automatically shut off because of the zero. But if it is in the park when slow down, that is, under the condition of the inverter, also trigger the thyristor conduction of high potential, and make the former a thyristor to withstand back pressure and shut off, at this time of thyristor in turn off there is a long time in the forward blocking state.

so, if after a thyristor conduction, not due to the effect of discharge of the inductor, make the thyristor continue conducting a cycle and into the positive half cycle, thyristor will continue the conduction block at the back of the thyristor conduction at the same time. So, thyristor output forward voltage and motor produce very big electric current electric potential superposition, then produce inverter, namely light burn out the fuse, or burn the thyristor. If CNC lathe workshop voltage power supply system is normal, no large fluctuations, may not burn out thyristor. Ac power grid voltage fluctuation is large, workshop transformer capacity is small, the overload operation, plus phase B is the set of trigger pulse amplitude is small, and the damage of the total power supply system switch box and other comprehensive reasons caused the failure.

processing methods:

1. Replace the automatic air circuit breaker;

2。 Replace the new thyristor;

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3。 Looking for to maintenance adjustments.

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