Maintenance and Troubleshooting | 6-35
Operating in Standby Mode (Fault Alarm)
When the detection of the HCDP is improbable, the built-in diagnostic
function activates and latches the Fault Alarm relay, turns LED 2 On, and
places the analyzer in Standby Mode. While in Standby Mode, the User
Interface flashes to alert the operator that immediate attention is required.
Since the Fault Alarm is latched, it can only be cleared manually, by the
operator. The analyzer continues to execute the measuring cycle and,
if the Fault is due to a problem in one of the internal optical paths, the
HCDP temperature is set to full-scale, 40 °C (104 °F).
The reason for the Standby Mode condition is provided in the SCode and
XSCode menus. SCode and XSCode are seen by repeatedly pressing the
‘+’ or ‘–’ button while viewing SCode or XSCode data. Detailed informa-
tion and corrective action for all of the SCode and XSCode conditions can
also be seen in the troubleshooting charts (see “Status Code, Alarm Condi-
tions, and Corrective Action”).
To verify that the Fault Alarm condition is real, and not simply caused by
electronic noise (e.g., due to an AC power surge or brown-out), attempt to
return the analyzer to normal operation by resetting the current alarms.
To reset alarms, view the “En\Dis Alrm?” prompt (Stat\History menu)
and press ‘+’ to clear the alarms.
If another Fault Alarm occurs during the next measuring cycle, attempt
to return to normal operation by resetting the Microcontroller board
(press the and ‘–’ buttons simultaneously). If yet another Fault Alarm
occurs during the first measuring cycle after the system reset, the ana-
lyzer requires service. See Chapter 7 for information about how to receive
customer support.
RUN Mode
Stat\HistorySCode (or
XSCode)
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