In addition to the numerical control device, the electrical control system also includes the electrical control system of the machine tool. The strong electronic control system of the machining center is mainly composed of plc and operation panel of ordinary AC motor drive and machine tool logic control device. The maintenance and maintenance of the relay contactor control system and plc programmable controller in the machine tool power supply control system were studied.
1. Dimensional control system of the relay total contactor control system In addition to the numerical control system, there is also an economical machining center relay contactor control system. Its maintenance work is mainly about how to take measures to prevent the strong electromagnetic interference of the contactors and relays in the strong electric cabinet. Contactors, relays and other electromagnetic components are the sources of interference in CNC systems. Due to the existence of the AC contactor, the frequent start and stop of the AC motor, electromagnetic induction will cause the peak or surge noise of the system control circuit, affecting the normal operation of the system. Therefore, we must take measures to eliminate these electromagnetic interference. For example, for AC contactor coils, connect parallel rc networks at both ends of the AC motor or three-phase input to suppress the interference noise generated by these devices. In addition, care should be taken to prevent oxidation of the contactor and relay contactor and poor contact.
2. Maintenance and maintenance of PLC programmable controller PLC is also an important electronic control component of the machining center. In addition to the auxiliary motion and auxiliary motion control of cnc machine tools, it also includes protection switches, various strokes and limit switches. In the above process, the PLC programmable controller can replace most of the machine tools in the CNC machine tool of the strong electric control system, and realize the control of the spindle tool change, lubrication, cooling, hydraulic, pneumatic and other systems. The PLC programmable controller is combined with the numerical control device and the device to form an internal PLC, and an independent PLC is formed outside the numerical control device. Since the structure of plc is similar to that of numerical control device, plc maintenance can refer to the maintenance of numerical control device.
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