Plasma cutting machine CNC system is the most important source of interference power section. It is generally taken to ignite the arc frequency arc. High-frequency transformer secondary voltage up 3000-6000V. Facing Hz pulse frequency. Radiation interference and pollution on the grid (interference) are very strong. There are high-current AC and DC contactors and various relays off the grid can also cause surges. Typically
plasma arc cutting machine together to cause the computer's internal chaos. Can not properly cut. The earliest CNC cutting machine even require the user to arc and then start the computer. Run the NC program. This not only makes complicated operation, the computer can not be fully utilized. And a serious impact on the life of the computer. The plasma is suppressed the occurrence of the interference power. Reduce pollution on the grid is the primary problem, specific measures:
a. high-frequency arc adds shield to reduce high-frequency radiation.
b. transformation of plasma cutting machine control circuit power supply.
Control supply original LG-200 plasma cutting machines directly from the mains voltage 220V. Start / interrupter control line leads directly to CNC cutting machine from the electrical cabinet. During power systems and CNC across tens of meters along the cable rack. Such high-frequency interference from plasma / interrupter caused. Electromagnetic interference caused by high current string directly into the grid. Measure is the strong increase in the electrical control line 220v isolation transformer. At the same time start / control signal interrupter relay isolation by relatively weak 24v AC line into the CNC control cabinet. Now PAC-200S to solve this problem.
c. Other anti-jamming measures
The main transformer primary side and secondary side increases RC snubber circuit and varistor. In the current contactors and relay coils at both ends of the parallel RC circuit. DC part of the set frequency bypass capacitor. The purpose of all these measures is to suppress the interference source, reducing pollution on the grid voltage.
