Emerson Rosemount 3051 Manual page 119

Status
Shows the state of the diagnostic is currently in.
• No Detections - Monitoring the process and no detections are
currently active.
• Inactive - User Command in "Idle", SPM not Enabled, or the
block is not scheduled.
• Learning - Detect has been set in the User Command, and the
baseline values are being calculated
• Verifying - Compares the learned values to the current calculated
values to verify the process is stable.
• Not Licenced - SPM is not currently purchased or enabled in this
device.
Mean Change Detected
Alert resulting from the Mean Change exceeding the Threshold
Mean Limit. Can be caused by a set point change, a load change in
the flow, or other obstruction or the removal of an obstruction in the
process.
High Variation Detected
Alert resulting from the Stdev Change exceeding the Threshold
High Variation value. This detection is a possible indicator for one
impulse line being plugged, equipment failure such as a pump, an
increase in the flow, or other flow turbulence.
Low Dynamics Detected
Alert resulting from the Stdev Change exceeding the Threshold Low
Dynamics value. This is an indicator for all impulse lines being
plugged, a lower flow, or other change resulting in a lowing of the
turbulence in the flow.
USER NOTE
In fieldbus devices, a wealth of information is available to the user.
Both process measurement and control is feasible at the device level.
The devices themselves contain both the process measurements and
control signals that are necessary to not only control the process, but to
determine if the process and control is healthy. By looking at the
process measurement data and control output over time, one can gain
additional insight into the process. Under some load conditions and
process demands, changes could be interpreted as degradation of
instruments, valves or major components such as pumps, compressors,
heat exchangers, etc... This degradation may also indicate that the loop
control scheme needs to be re-tuned or re-evaluated. By learning a
healthy process and continually comparing current information to the
known healthy information, problems due to degradation and eventual
failure can be avoided and remedied ahead of time. These diagnostics
are to aid in the engineering and maintenance of the devices. These
diagnostics can not possibly be 100% accurate in every process,
temperature, and circumstance. False alarms and missed detections
may occur. If a reoccurring problem in your process exists, please
contact Rosemount for assistance with the diagnostics.
Block Information
C-25