It turns out that when the machine fails, there is a higher value of clutter on the power supply; at the same time, the write end of the memory has a downward pulse. After detecting the waveform of the power supply, there are also clutter. This confirms the author's inference. At this point, it can be confirmed that the main cause of the machine tool failure is that electromagnetic interference from the outside causes the machine part parameters to be lost, so that the machine tool cannot work normally. It was later confirmed that electromagnetic interference was caused by a high-power electric welder in another workshop. After the power supply plus a smoothing reactor, the machine tool has been used so far, and no such problems have occurred. Example 2: In March 1999, our factory purchased two THK46100 horizontal machining centers from Kunming Machine Tool Co., Ltd., which uses a full-closed FANUCSERIESO-MC numerical control system.
After the installation is completed, after checking all the errors, the power supply starts the CNC system, and the following alarm information appears on the CRT screen: Therefore, the key inspection checks the No. 339 alarm. Check the feedback line and power line, and there is no short circuit or open circuit. Replacement of the axle card is invalid. Replace the Z-axis motor and encoder, driver, interface board, etc., the boot test failure remains. The Z-axis motor encoder feedback line M185 is interchanged with the X-axis M195. At this time, the alarm disappears, but the Z-axis motor sounds abnormally and produces a howling sound (the Z-axis motor power is greater than the x-axis power). This shows that there is no problem with the system, motor and wiring. After inspection, there is no problem with the setting of each parameter. Based on past experience, the author believes that electromagnetic interference may cause machine faults. Thus, each grounding system is re-determined. When the Z-axis motor cable is pulled out of the junction box, the malfunction disappears immediately. (Finish)
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