Heavy CNC Control System Maintenance and Maintenance of CNC Machine Tools

August 07, 2023

In addition to the CNC devices (including the spindle drive and feed drive servo systems), the numerical control machine tool electrical control system also includes the machine tool power control system. The machine power control system is mainly composed of the drive of an ordinary AC motor and the logic control device PLC and operation panel of the machine tool. Here is a brief introduction to the maintenance and maintenance of common relay contactor control systems and PLC programmable controllers in the machine power control system.
1 Maintenance and Maintenance of Ordinary Relay Contactor Control System

In addition to the CNC system, CNC machine tools have an ordinary 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 contactors and relays in power cabinets. Contactors, relays and other electromagnetic components in the power cabinets of CNC machine tools are all interference sources of the CNC system. Due to the AC contactor, when the AC motor is frequently started and stopped, the electromagnetic induction phenomenon will cause noises such as spikes or surges in the control circuit of the CNC system and interfere with the normal operation of the system. Therefore, we must take measures to eliminate these electromagnetic interferences. For AC contactor coils, for example, RC networks are connected in parallel at both ends or 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

PLC programmable controller is also an important electrical control part of CNC machine tools. In addition to the auxiliary motion and auxiliary motion control of the machine tool, the CNC power control system also includes the 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 strong electrical control system of the numerical control machine tool, thus realizing the 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 located outside the numerical control device, it constitutes a stand-alone PLC. As the structure of the PLC is similar to the CNC device, its maintenance and maintenance can refer to the maintenance and maintenance of the CNC device.

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Author:

Ms. SU LAN RONG

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susu@cn-tianhui.com

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