Troubleshooting and Maintenance 6-1
Troubleshooting and Maintenance
Any troubleshooting or maintenance to this Analyzer that requires access to the
interior of the various components must be performed by qualified service person-
nel only. There are no operator level serviceable parts, expendables, or maintenance
needs inside this equipment.
System Alarms
The system alarm contacts are activated when a condition exists which makes the analyzer output
questionable. The following error messages will be displayed on the bottom line of the analyzer display
when a system alarm condition exists:
CELL TEMP ALERT Moisture Cell temperature control is suspect (signal sent from
field unit).
LOW CELL FREQUENCY Activates when measured cell frequency is < 500 Hz.
HIGH CELL FREQUENCY Activates when measured cell frequency is > 3500 Hz.
NEGATIVE DELTA FREQUENCY Activates when delta frequency is < –1 Hz.
GEN TEMP ALERT Moisture Generator temperature control is suspect (signal sent
from field unit).
CAL ERROR Activates when the new calculated span value (Moist_Span)
exceeds the limits Max_Cal_Err or Max_Span Refer to Part III:
Alarm Button for more information on these limits. Deactivates
after successful calibration.
DISPLAY OVER-RANGED A displayed value exceeds the allotted display area.
MEMORY IS CORRUPTED The RAM or RAM battery has failed causing factory default
parameters to be loaded into memory.
It is common for some of these system alarms to activate momentarily during normal operation, espe-
cially during equilibration periods between measurement cycles. If system alarm persists, there may
be a problem with the measuring cell, the moisture generator, or the thermal controller.
Computer Operating Properly Alarm
This alarm, also known as the COP or watchdog alarm, activates when normal CPU logic flow is dis-
rupted. Possible triggers of this alarm are power failure, internal power failure, software problems, or
extreme electronic interference. When activated, the COP alarm generates a system reset but software
configuration parameters are retained. The system does not have to be reconfigured.
!
WARNING
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