Honeywell DCP552 Mark II user manual 10 1 Self-Diagnostic Functions and Alarm Code Displays

Chapter 10. TROUBLESHOOTING

10 - 1 Self-Diagnostic Functions and Alarm Code Displays

The DCP552 is equipped with the self-diagnostic functions described below. Alarm codes and the result of self- diagnostics are listed on the following pages.

■Power ON self-diagnostic routines

● RAM backup failures

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.

●Board configuration failures

This routine detects failures caused when boards (circuit boards) not designed to be used with the DCP552. Alarm codes are displayed when errors are detected.

■Self-diagnostic routines performed each sampling cycle

●Analog input failures

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.

■Self-diagnostic routines performed continuously during operation

●PROM failures

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.

●Adjustment data failures

This routine detects errors in analog inputs and output adjustment data stored in non-volatile memory. Alarm codes are displayed when errors are detected.

●Program failures

This routine detects failures in program setting data stored in a backup RAM.

Alarm codes are displayed when errors are detected.

●Parameter failures

This routine detects failures in parameters stored in a backup RAM. Alarm codes are displayed when errors are detected.

●Low battery voltage

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.

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