Yaskawa MP920 User's Manual Design - Manual (Page 493)

12.1 Overview of Troubleshooting
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12.1.2 Basic Troubleshooting Flow
When a problem occurs, it is important to determine the cause and treat the problem fast to
get the system up and running as quickly as possible. The following table shows the basic
troubleshooting flow.
No. Point Basic Details Examined
1 Visual Check • Equipment operation (status while stopped)
• Power ON/OFF
• I/O equipment status
• Wiring status
• Status of indicators (indicators on all Modules)
• Status of all switches (DIP switches and other
switches)
• Parameters and program content check
2 Error Check Observe whether the following alters the error in
any way.
• Stopping the Controller.
• Resetting the alarm.
• Turning power OFF and ON.
3 Narrowing the
Range Consider possible failure locations based on the
results of 1 and 2 above.
• Is the problem in the Controller or external?
• Is the problem in sequence control or motion con-
trol?
• Is the problem software or hardware?