The CNC plasma cutting machine sometimes has high-frequency interference during work. At present, there is no particularly good way to solve this problem, but we can use other methods to minimize the interference. Today, we introduce to you a method: safe specification of CNC plasma cutting machine wiring operation. Overflow And Jet Dyeing Machine Overflow And Jet Dyeing Machine,Jet Dyeing Machine,Dyeing Jet Machine,Jet Machine For Dyeing HESHAN CITY HONGFA COMPLETE SOLUTIONS MACHINE LTD. , https://www.hshongfamachine.com
Compared to general CNC equipment, plasma cutting is relatively complicated because of the relatively special environment in which the design of various lines in the factory building is relatively complicated. In order to reduce the interference of plasma arc ignition and the impact of other equipment on it, the relevant lines The connection requirements are as follows:
First, the plasma cutting machine power input line adopts the power line of shielded wire CNC plasma arc cutting system. The cathode wire of the cutting tool and the plasma start/extinguishing control wire are suspended together on the sliding bracket, which is equivalent to several tens of meters of parallel wiring. The starting/extinguishing control wire and the cathode wire of the cutting tool come from the plasma power supply and the cathode of the cutting tool. The on-line DC current is more than 100 amps. The electromagnetic field generated by it and the high-frequency signal of the high-frequency arc runner will cause electromagnetic interference to the power supply of the CNC and the servo unit.
Shielded cables with copper and aluminum shields can effectively suppress high-frequency electromagnetic interference. After the shield layer is grounded, it can also suppress the electrostatic induction of the core by changing electric fields.
Second, the use of plasma cutting machine power transformer Use a shielded power transformer, the shield should be connected with the primary winding of the AC zero line, can prevent interference into the secondary side of the power transformer, shielded power supply for the numerical control device and servo unit Separate transformers also prevent mutual interference. The numerical control device can be replaced with a purified AC stabilizer or an interference suppressor made by using the principle of spectrum equalization, which will enhance its ability to resist grid interference.
Third, the plasma cutter wiring design requirements to avoid the ground resistance to the AC power line to introduce the interference to the control device, both to ensure the safety of the control system device internal devices, but also can improve the reliability and stability of the system, reduce the strong current device Ground current interference.
In addition, on the line connection, it is necessary to mainly float the logic and separate it from the analog ground. Floating refers to the non-conductor connection between the logic ground and the analog ground of the control device and the ground, and is systemized by the floating “groundâ€. Reference level. This makes external radiation interference such as plasma arcs and electrostatic interference largely suppressed.
Due to the logic increase in the interference induction of the analog circuit, a good method is to connect the analog ground and the logic ground to the respective busbars, and then pass the analog ground bus through a grounding point where the capacitor is grounded at a little street. . For analogs, DC floating grounds are formed and the common ground system is exchanged.
IV. Other Precautions When the conditions permit, the power supply of the numerical control device uses the lighting power, because the lighting power is relatively clean; the DC relay coils continue to flow through the diodes, and the AC relay coils and the RC RC circuit suppress the transient interference.
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