Mitsubishi Electronics C6/C64 Benutzerhandbuch

3.2  Troubleshooting 

 
 

II - 18 

Confirm "when", "when doing what", and "what kind of" trouble occurred. 

 

What time did the trouble occur? 

 

What was the NC operation mode? 

•  During automatic operation  .........   Program No., sequence No. and program details when the 

trouble occurred. 

•  During manual operation .............  What was the manual operation mode? 

What was the operation procedure? 

What were the previous and next steps? 

•  What was the setting and display unit screen? 

•  Did the trouble occur during input/output operations? 

•  What was the machine side state? 

•  Did the trouble occur while replacing the tools? 

•  Did hunting occur in the control axis? 

 

•  What was displayed on the setting and display unit's Alarm Diagnosis screen? 

  Display the Alarm Diagnosis screen, and check the alarm details. 

•  What was displayed for the machine sequence alarm? 

•  Is the LCD screen normal? 

 

•  When did the trouble occur? What was the frequency? (Does it occur when other machines 

are operating?) If the trouble occurs infrequently or if it occurs during the operation of another 

machine, there may be an error in the power voltage or the trouble may be caused by noise, 

etc. Check whether the power voltage is normal (does it drop momentarily when other 

machines are operating?), and whether noise measures have been taken. 

•  Does the trouble occur during a specific mode? 

•  Does the trouble occur when the overhead crane is operating? 

•  What is the frequency in the same workpiece? 

•  Check whether the same trouble can be repeated during the same operation. 

•  Check whether the same trouble occurs when the conditions are changed. (Try changing the 

override, program details, and operation procedures, etc.) 

•  What is the ambient temperature? 

  (Was there a sudden change in the temperature? Was the fan at the top of the control unit 

rotating?) 

•  Is there any contact defect or insulation defect in the cables? 

  (Has any oil or cutting water splattered onto the cables?)