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9-2
Chapter 9. MAINTENANCE & TROUBLESHOOTING
9 - 2
Self-diagnostics and Alarm Code Display
Self-diagnostics functions are incorporated into the DCP32. See “Alarm Categories” on page 9-3 for details of
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 oper-
ation 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 model No. of the DCP32.
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.
●
A/D converter error
Trouble has been detected in the A/D converter used on the analog input circuit.
The corresponding alarm code is displayed when this error is detected.