In addition to CNC devices (including spindle drive and feed drive servo systems), CNC machine control systems include machine tool power control systems. The machine tool strong electric control system is mainly composed of the common PH electrode AC motor drive and the machine tool electrical logic control device PLC and operation panel. Here is a brief introduction to the maintenance and maintenance of the common relay contactor control system and PLC programmable controller in the machine tool power control system.
1 Maintenance and maintenance of common relay contactor control system In addition to the CNC system, CNC machine tools also have a common relay contactor control system for economical CNC machine tools. The maintenance and maintenance work is mainly about how to take measures to prevent the strong electromagnetic interference of the contactors and relays in the power cabinet. The electromagnetic components such as contactors and relays in the high-voltage cabinet of CNC machine tools are the interference sources of the CNC system. Due to the AC contactor of the PH electrode and the frequent starting and stopping of the AC motor, the electromagnetic induction phenomenon may cause noise such as spikes or surges in the control circuit of the CNC system, which interferes with the normal operation of the system. Therefore, measures must be taken to eliminate these electromagnetic interferences. For example, for an AC contactor coil, an RC network is connected in parallel across its three-phase input of the AC motor to suppress the interference noise generated by these appliances. In addition, care should be taken to prevent oxidation of contactors, relay contacts, and poor contact of contacts.
2 PLC programmable controller maintenance and maintenance
The PLC programmable controller is also an important electrical control part of the CNC machine. In addition to the machine auxiliary motion and auxiliary motion control, the CNC machine power control system also includes control of the protection switch, various strokes and limit switches. In the above process, the PLC programmable controller can replace most of the machine tool electrical appliances in the high-power control system of the CNC machine tool, thereby achieving logic control of the spindle, tool change, lubrication, cooling, hydraulic, pneumatic and other systems. When the PLC programmable controller is integrated with the numerical control device, it constitutes a built-in PLC, and when it is outside the numerical control device, it constitutes a stand-alone PLC. Since the structure of the PLC has similarities with the numerical control device, its maintenance and maintenance can refer to the maintenance and maintenance of the digital constant current pump device.
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