CNC machining center has now become the main equipment of modern automation and electrical integration production development, and is now also a large number of and widely used in the machinery manufacturing and processing industry, the electrical equipment and its line in the machine tool play a very important role, directly determines the performance and operational stability of the machine tool, but also affects the control of the machine tool, equipment functions and safety performance. Therefore, it is necessary to comprehensively deepen the ability of machine tool electrical fault diagnosis and maintenance. The following Kunshan Duyang CNC to share with you CNC machining center electrical failure and how to repair. 1. Electrical equipment failure 1. The action command signal is abnormal The abnormality of the action instruction signal will lead to the failure of the operation execution of the machine tool, and the action execution failure is also divided into the fault of the parts and components themselves and the fault of the mechanical parts. Electrical equipment that is prone to the failure of parts and components are servo motor system, drive shaft controller, mechanical positioning system, solenoid valve control, solenoid coil, proportional valve, motor, high and low voltage distribution system, oil pipeline, etc. Once the failure of these parts and components, it will cause the machine tool to stop reporting errors, and even may cause safety accidents. Therefore, such action command signal abnormal electrical equipment failure, it is necessary to carry out the parts of the execution of the action signal is normal, such as the action command signal is correctly transmitted, parts of the components are powered on, signal electrical equipment and circuit system voltage and current is normal, in addition to the parts of the electrical equipment connected to the mechanical equipment should also be detected. 2. The intermediate control is faulty There are two common fault modes of intermediate control fault, which are CNC system fault and auxiliary device and electrical equipment control circuit fault. The intermediate control failure at this stage will be timely fed back to the numerical control device when it occurs, make an alarm alarm in time, and stop immediately, which is easier to solve than other faults or hidden dangers that are difficult to find. 3. The signal detection is abnormal The occurrence of abnormal signal detection work usually has two kinds of fault of the detection equipment itself and the signal fault of the mechanical processing parts related to the detection equipment. The testing equipment includes speed and position information testing equipment for cutting tools and worktables, speed measuring motors, position encoders, grating induction devices and various sequence control testing equipment, such as air switches, solenoid valves, pressure switches and so on. All of the above detection devices are more or less connected to the relevant machining parts they control or the gas-liquid pipelines of CNC machine tools, so the connection signal detection of the relevant machining parts can not be ignored when the signal detection work of the testing equipment itself is fully carried out. Second, electrical fault maintenance 1. Signal indication analysis CNC machining center machine tools have been set up in the early design of the numerical control system, electrical equipment, servo system of the electronic anomaly detection and alarm system, once detected abnormal or fault will be timely feedback to the numerical control system, and hardware alarm such as the top alarm fault indicator light, The operator can analyze and judge the cause of the fault and the location of the component according to the alarm fault indicator light and the error code in the numerical control system, and timely handle the fault and eliminate the danger alarm. 2. Check the interface status For the CNC machining center machine tool electrical system and related equipment and pipelines, it is entirely possible to use power detection instruments such as multimeters, ammeters, voltmeters, etc., to carry out DC power supply or pulse signal detection of the electrical system, and find the cause of possible failures from the circuit. Through the multimeter detection of the circuit, power supply or circuit board related signal status measurement, oscilloscope pulse signal detection, PLC programming program to find the cause of the fault and the approximate location, etc., can effectively improve the machine tool electrical equipment diagnosis, maintenance level and efficiency. 3. Test program import method This method compiles the functional test program by CNC program itself or external manual programming, and then imports it into the CNC system of CNC machine tools for the analysis and integration of various operating parameters and data and the self-test and diagnosis of the program, which can effectively detect and diagnose various electrical equipment and its pipelines. The stability and accuracy of the machining working parts connected with PLC are tested, so as to realize the diagnosis and maintenance of the causes and possible parts of the machine tool failure.