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

Shenyang No. 1 Machine Tool is a renowned name in the machine tool industry, known for its precision and reliability. Automatic running and feed pause signals play a crucial role in ensuring the smooth operation of these machines, preventing potential damages, and ensuring the safety of operators.

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. Understanding the Automatic Running Pause (Feed Pause) Signal

The feed pause signal is a command that temporarily stops the automatic operation of a machine tool. It is designed to halt the feed of the cutting tool or workpiece movement, allowing for adjustments, inspections, or troubleshooting.

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.

3. Common Reasons for Inputting Feed Pause Signal

  • Mechanical issues: Worn-out parts, misalignments, or mechanical failures can trigger the feed pause signal.
  • Electrical issues: Faulty wiring, sensor malfunctions, or electrical overloads can cause interruptions in the feed system.
  • Software and programming errors: Incorrect programming codes or software glitches can lead to unintended pauses in operation.
  • Environmental factors: Temperature fluctuations, humidity, or contaminants can affect machine performance and trigger feed pause signals.

4. Diagnostic Methods

To identify the root cause of the feed pause signal, various diagnostic methods can be employed:

  • Visual inspection: Checking for visible signs of wear, damage, or misalignment.
  • Electrical testing: Using multimeters and oscilloscopes to test electrical components and wiring.
  • Software diagnostics: Reviewing the machine’s programming and software logs for errors.
  • Consultation with technical support: Seeking expert advice and guidance from the machine manufacturer or technical support team.

5. Treatment Methods

Based on the diagnosis, appropriate treatment methods can be applied:

  • Mechanical adjustments and repairs: Replacing worn-out parts, realigning components, or repairing mechanical failures.
  • Electrical repairs and replacements: Fixing faulty wiring, replacing damaged sensors, or addressing electrical overloads.
  • Software updates and reprogramming: Updating the machine’s software or reprogramming to correct errors.
  • Environmental adjustments: Implementing measures to control temperature, humidity, or contaminants.

6. Preventive Measures

To avoid feed pause signal issues in the future:

  • Regular maintenance: Scheduling routine inspections and maintenance activities.
  • Operator training: Providing training to operators on proper machine operation and troubleshooting techniques.
  • Monitoring and early detection systems: Installing sensors and monitoring systems to detect issues early.
  • Environmental controls: Implementing measures to control the machine’s operating environment.

7. Case Studies

  • Case Study 1: A machine experiencing frequent feed pause signals due to a misaligned part. Diagnosis revealed a worn-out bearing, which was replaced, and the machine resumed normal operation.
  • Case Study 2: An electrical overload caused by faulty wiring led to repeated feed pause signals. Electrical testing identified the issue, and the wiring was repaired to resolve the problem.

8. Conclusion

Understanding the reasons for inputting the automatic running pause (feed pause) signal in Shenyang No. 1 Machine Tool is essential for maintaining optimal machine performance. Timely diagnosis and treatment of issues can prevent downtime, reduce repair costs, and ensure the safety and efficiency of machine operations. By implementing preventive measures and regular maintenance, operators can minimize the occurrence of feed pause signals and prolong the lifespan of their machine tools.

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