1. Visual inspection method It is the first method used by maintenance personnel, that is, when the fault diagnosis is performed, the inspection is performed one by one from the outside to the inside. Pay special attention to observe whether the components and circuits of the circuit board have burns, cracks, etc., whether there is a short circuit or open circuit on the circuit board, and the chip is in poor contact. For the repaired circuit board, pay attention to whether there are missing or wrong parts. Parts and disconnection.
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2. Function program test method The function program test method is to program the G, M, S, T, F functions of the numerical control system into a functional test program by programming method, and store them on the corresponding media, such as paper tape and tape. Run this program during troubleshooting to quickly determine the likely cause of the failure.
Functional program test method is often used in the following occasions
1) The machining of CNC machine tools causes waste and it is impossible to determine whether the programming operation is improper or the CNC system is faulty.
2) Random failure of the CNC system. It is difficult to distinguish between external interference or system stability.
3) When the CNC machine tool with a long idle time is put into use or when the CNC machine tool is regularly inspected.
3. Heuristic exchange method, in the case of analyzing the general cause of the fault, the maintenance personnel can replace the suspected part with the spare printed circuit board, integrated circuit chip or component, thereby narrowing the fault range to the printed circuit board or chip one. level.
Before using this method, the CNC machine should pay attention to whether the setting state of the standby board is exactly the same as the state of the original board. This includes checking the selection switch on the board, setting the position of the shorting bar, and the position of the potentiometer. Generally, do not put the CPU board and the memory board more easily. Otherwise, the program and machine parameters may be lost, causing the fault to expand. If it is an EPROM board or an EPROM chip, please note that the software version label attached to the memory chip is exactly the same as the original board. If they are inconsistent, they cannot be replaced.
4. Parameter check method When the CNC machine tool fails, the system parameters should be checked in time. The parameters are generally stored in the bubble memory or stored in the CMOS RAM to be held by the battery. Once the battery is insufficient or due to external interference, etc., the individual parameters are lost or Changes, confusion, and the machine does not work properly. At this point, the fault can be eliminated by checking and correcting the parameters.
5. Measurement comparison method When the CNC machine tool manufacturer designs the printed circuit board, in order to adjust and maintain the convenience, some detection terminals are designed on the printed circuit board. The maintenance personnel can check whether the working state of the circuit is normal by detecting the voltage or waveform of these measuring terminals. However, before using the test terminals for measurement, you should be familiar with the function of these test terminals and the electricity of the relevant parts. 