Samson 3730-3 - Analysis and Monitoring

38 EB 8389 EN
Statistical information
− The 'Average value x short' contains the
average class assignment for the last
100 measured values.
The positioner saves the valve positions in a
circular buffer, which holds 100 measured
values at one time.
On changing scan rate in 'Scan rate short-
term histogram', all existing measured values
are deleted from the circular buffer.
Dening parameters
1. Set 'Scan rate short-term histogram'.
2. Select classication for status messages.
1.
Diagnosis > Statistical information > Travel
histogram x > Short-term
− Scan rate short-term histogram:
1 to 3600s, [1s]
1)
Types3730-2/-3/-4/-5 (1.5x) and Type3731-3:
2.
Settings > Positioner > Error control >
Classication report > Extended > ...
Shifting working range
− Shifting working range to closing position:
[
], , , ( ), ( )
− Shifting working range to max. opening
position:
[
], , , ( ), ( )
Working range
− Mostly near closing position:
[
], , , ( ), ( )
− Mostly near max. opening:
[
], , , ( ), ( )
− Mostly closing position:
[
], , , ( ), ( )
− Mostly max. opening:
[ ], , , ( ), ( )
Type3730-5 (1.6x) and Type3731-5:
2.
Settings > Positioner > Diagnosis
conguration > Classication
− Shifting working range: [
], , , ,
1)
Type3730-4: [864s]
4.3.1 Analysis and monitoring
Analysis of the histogram for control valves
starts one hour after the observation period
begins. No analysis is performed for on/off
valves.
If the control valve mainly works during the
observation duration near or in one of the
end positions, the positioner generates the
'Working range' message with the selected
status classication.
For analysis of the short-term monitoring, a
complete set of data (100 measured values)
is required.
The positioner generates the 'Shifting work-
ing range' message with the selected status
classication whenever a trend showing a
change in the working range is found from
the analysis of the histogram and the short-
term monitoring.
Diagnosis > Status messages > Extended
− Shifting working range
− Working range
1)
1)
Not Type3730-5 (1.6x) and Type3731-5
Note