1. Intuitive method This is the most basic method. Maintenance personnel can often reduce the fault range to a module or a printed circuit board by observing various abnormal phenomena such as light, sound and taste during the fault and carefully checking each part of the system. This requires maintenance personnel to have a wealth of practical experience, a multidisciplinary wide knowledge and comprehensive judgment. 1. Farm Fence: This is a type of fence that is used on farms to keep animals in specific areas and prevent them from wandering off. It is usually made from wood, metal, or a combination of both. Farm Fence,Galvanized Wire Fence,Farm Fence Wire,Horse Fence Wire Hebei Aibuer trading co., Ltd , https://www.ablewiremesh.com
2. Self-diagnostic function method Although the modern numerical control system has not yet reached a high degree of intelligence, it has already possessed a strong self-diagnosis function. The hardware and software of the CNC system can be monitored at any time. Once an anomaly is found, an alarm message is immediately posted on the CRT or the LED is used to indicate the approximate cause of the fault. The self-diagnosis function can also display the status of the interface signal between the system and the host to determine whether the fault occurred in the mechanical part or the CNC system part, and to identify the approximate part of the fault. This method is the most effective method for current maintenance.
3. Functional program test method The so-called function program test method is to use the manual function or special programming method of the common functions and special functions of the numerical control system, such as linear positioning, circular interpolation, thread cutting, fixed cycle, user macro program, etc. The function program tests the tape, feeds it into the CNC system through the tape reader, and then starts the CNC system to run it, thereby checking the accuracy and reliability of the machine performing these functions, and then judging the possible cause of the failure. This method is difficult to determine whether it is a programming error or an operation error for the inspection of the long-time idle CNC machine when the machine is turned on for the first time and the machine tool processing causes waste, but there is no alarm, or the judgment of the machine fault is a good one. method.
4. Exchange method This is a simple and easy method and one of the most commonly used methods for on-site judgment. The so-called exchange method is to analyze the fault cause, the maintenance personnel can replace the suspected part with the spare printed circuit board, template, integrated circuit chip or component, thereby reducing the fault range to the printed circuit board or chip one. level. It is actually verifying the correctness of the analysis.
Before the standby board is exchanged, you should check whether the standby board is in good condition and check that the status of the standby board is exactly the same as the original board. This includes checking the selector switch on the board, the set position of the shorting bar, and the position of the potentiometer. When replacing the memory board of the CNC device, it is often necessary to initialize the memory of the system (such as the bubble memory used by the FS-6 system of FaNUC Corporation of Japan, this work is required), and reset various numerical control data. Otherwise the system will still not work properly. Another example is to replace the memory board of the 7-system of the FaNUC company, and then re-enter the parameters and assign the memory area. The latter step is missing, and once the part program is entered, an alarm No. 60 will be generated (the memory capacity is insufficient). Some CNC systems require some specific operations after the motherboard has been replaced. For example, if FNUC is in the FS-10 system, you must enter the parameters from 9000 to 9031 according to certain operating procedures, and then enter the system parameters and PC parameters from 0000 to 8010. In short, it must be strictly in accordance with the requirements of the system operation and maintenance instructions.
5. Transfer method The so-called transfer method is to exchange two printed circuit boards, modules, integrated circuit chips or components with the same functions in the CNC system to observe whether the fault phenomenon is transferred. Thereby, the fault location of the system can be quickly determined. This method is actually a kind of exchange method. Therefore, the relevant precautions are as described in the exchange method.
6. The parameter inspection method is well known, and the numerical control parameters can directly affect the functions of the numerical control machine tool. The parameters are usually stored in the bubble memory or stored in the CMOS RaM that needs to be held by the battery. Once the battery is insufficient or due to some external interference, the individual parameters will be lost or changed, and the machine will not work properly. At this point, by checking and correcting the parameters, the fault can be eliminated. When the machine tool is idle for a long time, if there is an abnormal phenomenon or a fault without an alarm, the relevant parameters should be checked and corrected according to the fault characteristics.
In addition, after long-term operation of CNC machine tools, due to the wear of mechanical transmission components, electrical changes in the performance of components, etc., it is also necessary to adjust the relevant parameters. Some machine tool failures are often caused by not modifying certain unsuitable parameters in time. Of course, these faults are all in the category of faults.
7. Measurement and comparison method When the CNC system manufacturer designs the printed circuit board, a plurality of detection terminals are designed on the printed circuit board for the convenience of adjustment and maintenance. Users can also use these terminals to compare the difference between a normal printed circuit board and a faulty printed circuit board. The voltage or waveform of these measurement terminals can be detected to analyze the cause of the fault and the location of the fault. Even sometimes, "faults" can be artificially created on normal printed lines, such as disconnecting or shorting, dialing components, etc., to determine the cause of a real fault. To this end, the maintenance personnel should accumulate the correct waveform and voltage value of the key parts of the printed circuit board or the faulty parts at normal times. Because CNC system manufacturers often do not provide information on this.
8. The fault that occurs when the system is struck is that if there is no time, the location of the fault can often be detected by tapping. This is because the CNC system is composed of a plurality of printed circuit boards, each of which has a plurality of solder joints, and the boards or modules are connected by connectors and cables. Therefore, any solder joint or poor contact may cause a malfunction. When the insulator is used to gently tap the suspected spot with weak soldering and poor contact, the fault will definitely be repeated.
9. After the long-term operation of the localized temperature-increasing CNC system, the components are aging and the performance will deteriorate. When they are not completely damaged, the failures that occur sometimes become absent. At this time, a hot hair dryer or a soldering iron can be used to locally heat up the suspected components and accelerate their aging to completely expose the faulty components. Of course, when using this method, you must pay attention to the temperature parameters of the components, etc., do not burn the original good device.
10. The principle analysis method can logically analyze the logic level and characteristic parameters (such as voltage value or waveform) of each point according to the composition principle of the CNC system, and then measure, analyze and compare with a multimeter, logic pen, oscilloscope or logic analyzer. Thereby positioning the fault. Using this method requires maintenance personnel to have a clear and deep understanding of the principles of the entire system or each circuit.
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