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Chapter 10. TROUBLESHOOTING
10-1 Self-Diagnostic Functions and Alarm Code Displays
The DCP551 is equipped with the self-diagnostic functions described below. Alarm codes and the result of self-diag-
nostics are listed on the following pages.
Power ON self-diagnostic routines
RAM backup failures
Board configuration failures
Self-diagnostic routines performed each sampling cycle
Analog input failures
Self-diagnostic routines performed continuously during operation
PROM failures
Adjustment data failures
Program failures
Parameter failures
Low battery voltage
This routine is designed to detect errors in the RAM backup function. When a failure is
detected, a general reset is performed. No alarm code is displayed.
This routine detects failures caused when boards (circuit boards) not designed to be used
with the DCP551. Alarm codes are displayed when errors are detected.
Failures are detected when the analog input signal due to disconnection or other cause
lies outside the –10.0 to +110.0% range.
Alarm codes are displayed when errors are detected.
This routine is designed to detect errors in system programs stored in the PROM. Not
totally infallible, there are cases where errors go undetected and result in measuring
device operation failure.
Alarm codes are displayed when errors are detected.
This routine detects errors in analog inputs and output adjustment data stored in non-
volatile memory. Alarm codes are displayed when errors are detected.
This routine detects failures in program setting data stored in a backup RAM. Alarm
codes are displayed when errors are detected..
This routine detects failures in parameters stored in a backup RAM. Alarm codes are
displayed when errors are detected.
This routine detects low voltage conditions in the battery that backups RAM data. The
BAT LED on the console goes on when battery voltage is too low.
10-1
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