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The Reason And Treatment Method Of Shenyang No. 1 Machine Tool Inputting The Automatic Running Pause (Feed Pause) Signal


1. Shenyang No. 1 Machine Tool has input the automatic running pause (feed pause) signal

Use the PMC diagnostic function (PMCDGI) to check the status of the feed pause signal. Check the diagnosis number C0008’sP as the automatic running pause (feed pause) signal. When the automatic running pause button is not pressed, it is normal to be “l”, that is, when the automatic running pause button of Shenyang No. 1 machine tool is pressed, it is “O”.

2. Case analysis

The CSM-25RN gear shaper produced by Japan’s Karatsu Iron Works is equipped with the FANUCI1 system.

Fault phenomenon: When the automatic circulation mode suddenly stops working, the CRT has no display, and the seven-segment display on the main board displays the alarm A.

Fault analysis: Judging from the alarm A displayed on the seven-segment display, it indicates that the connection of the MDI/CRT unit is abnormal. For this kind of failure, generally first check the MDUCRT connector and optical fiber cable of Shenyang No. 1 Machine Tool, and then check the main board. After inspection, it was found that there is no problem.

From the perspective of no CRT display, it is believed that the problem lies in the power supply of the MDI/CRT. After inspection, it was found that there was a short circuit in the 24V power supply. Finally, 3 faults were found: fuses F21, F22 (3 2A) were blown; 1 capacitor iOOOpLF/35V) (at the C29 position of the printed circuit board) was short-circuited; 2 transistors Q15 (03164) were broken down.

After replacing the above three spare parts, the system returned to normal. It can also be seen from this example that the alarm prompt of the CNC system is of great benefit to Shenyang No. 1 Machine Tool to analyze the cause of the failure. However, this kind of prompt has its limitations after all, and it is impossible to indicate all the root causes of the failure.

That is to say. The FANUC11 system can’t go from alarm to report level: Therefore, when troubleshooting the fault, it should be analyzed according to its prompt and combined with the actual fault phenomenon, and must not be restricted by the prompt box.


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