CNC plasma cutter wiring requirements and precautions
CNC plasma cutting machine wiring contains the power control cabinet and torch control signal line connection work, safety specifications of CNC plasma cutting machine wiring operation can effectively reduce the plasma cutting machine caused by high-frequency interference impact, which is the current CNC plasma cutting machine too dependent on the control system anti-jamming ability design, is undoubtedly a good complement.
Plasma cutting relative to general numerical control equipment, due to the use of a relatively special environment, plant cutting and processing of various line design connections will be relatively complex, in order to reduce the interference of plasma arc, and other equipment to its interference impact, the relevant line connection requirements are as follows:
First, plasma cutting machine power supply line using shielding line
The power cord of the CNC plasma arc cutting system. The cathode line of the cutting and the plasma start/arc control line hang together on the sliding bracket, which is equivalent to tens of meters of flat walking line, while the cathodic line of the start/arc control line and cutting gear comes from the plasma power supply, the cut's cathode line DC current hundreds of amperes, and the high-frequency signal of the cutting electromagnetic field and high-frequency arcing device is coupled to cause electromagnetic interference to the CNC device (CNC) and servo unit.
Shielded cables with copper and aluminum as shielding layers can effectively suppress high-frequency electromagnetic interference, and the shield can also inhibit static induction of changing electric field to core swire after grounding.
Second, the use of plasma cutting machine power transformer
With a shielded power transformer, the shield layer is connected to the AC zero line of a side winding, which prevents interference from entering the secondary side of the power transformer, and the separate shielded power transformer used by the CNC and servo unit prevents interference with each other. Among them, the numerical control device can be used to purify the AC stabilizer, or increase the interference suppressor made of spectral equalization method, which will enhance its ability to resist grid interference.
Third, plasma cutting machine wiring design requirements
Avoid ingerified interference from AC power lines to control devices due to ground resistance, which not only ensures the safety of the internal devices of the control system, but also improves the reliability and stability of the system and reduces the geocurrent interference of strong current equipment.
In addition, in the line connection to mainly the logical floating and analog land separate, floating surface refers to the control device of logical, analog land and land between the non-conductor connection, to float the "ground" as the system reference level. This allows external radiation interference such as plasma arcs and static interference to a large extent to be suppressed.
Because of the logical increase of interference sensing of the analog circuit, a good method allows the analog ground and logically separate disconnection sending the respective convection row, and then the simulated sink flow through a capacitor at a point of the bottom of the street. For analog quantities, a DC floating ground, AC-co-ground system.
Other considerations
Conditional, the cnc device's power supply uses lighting power, because the lighting power is relatively clean, DC relay coil and continuous flow of secondary tube, AC relay coil and RC capacity circuit, to suppress transient interference.
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