Mitsubishi Electric E80 Series, Maintenance Manual

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M800/M80/E80 Series Maintenance Manual
5 Troubleshooting
140 IB-1501273-F
5Troubleshooting
If trouble occurs during operation, the accurate cause must be found so that adequate measures can be taken. Perform the
following checks for this.
5.1 Troubleshooting
Confirm "when", "when doing what", "what kind of trouble" and "how frequently" the trouble occurred. Also check how many
years the machine has been operated, and how many hours a day it is used.
(1) General confirmation items
 MTB and type of machine
(2) When?
 What time did the trouble occur?
 How long had passed after the power was turned ON?
(3) What kind of trouble?
 What was displayed on the Alarm Diagnosis screen of the display unit?
Display the Alarm Diagnosis screen, and check the alarm details.
 What was displayed for the machine sequence alarm?
(4) What were you doing when this occurred?
 What was the NC operation mode?
During automatic operation: Program No., sequence No. and program details when the trouble occurred.
During manual operation: manual operation
 What was the operation procedure?
 What were the previous and next steps?
 What screen is displayed on the display unit of MTB?
 What is the state of the peripheral devices?
 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?
(5) How frequently does the trouble occur?
If the trouble occurs infrequently or if it occurs during the operation of another machine, the cause may be an error in
the power voltage or the 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.
 How frequently does the trouble occur in a day? (Times/day)
 Were the peripheral devices operating?
 Check whether the same trouble is repeated during the same operation. (Repeatability)
 Check whether the same trouble occurs when the conditions are changed.
 Does the trouble occur during a specific mode?
 What is the frequency in the same workpiece?
 What is the ambient temperature?
(Was there a sudden change in the temperature?)
 Is there any contact defect or insulation defect in the cables?
(Is there any oil or cutting oil splattered onto the cables?)