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Chapter 9. TROUBLESHOOTING
9-1
Chapter 9. TROUBLESHOOTING
9-1 Self-diagnostics and Alarm Code Display
Self-diagnostics functions are incorporated into the controller. The table on the following page shows the alarm codes
that are displayed as a result of self-diagnostics.
■ Self-diagnostics at power ON
● PROM error
An error in the system program stored to PROM has been detected. However, note that
not all PROM errors are detected. Some errors are detected as controller operation errors.
The corresponding alarm code is displayed when this error is detected.
● Adjustment value error
An error in the analog I/O adjustment data stored to volatile memory has been detected.
The corresponding alarm code is displayed when this error is detected.
● RAM backup error
An error in the RAM backup function has been detected.
When this error is detected, a general reset is carried out.
An alarm code is not displayed for this error.
● Board configuration error
An error in the board configuration (combination of different PCBs) has been detected
according to the catalog No. of the controller.
The corresponding alarm code is displayed when this error is detected.
■ Self-diagnostics at each sampling cycle
● Analog input error
A probable cause of this error is a disconnected analog input. This error is detected when
the analog input is outside the -10.0 to 110.0% range.
The corresponding alarm code is displayed when this error is detected.
● MFB (motor feedback) input error
Disconnected MFB input or a short-circuit has been detected on 2G output models.
The corresponding alarm code is displayed when this error is detected.
■ Intermittent self-diagnostics during operation
● Program error
An error in the program setup data stored to backup RAM has been detected.
The corresponding alarm code is displayed when this error is detected.
● Parameter error
An error in the parameter setup data stored to backup RAM has been detected.
The corresponding alarm code is displayed when this error is detected.
● Low battery voltage error
A drop in the battery voltage for backing up RAM data has been detected.
When the low battery voltage error is detected, the red BAT LED on the console blinks.