EB 8389 EN 59
Statistical information
4.8 Trend of travel end position
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• • • • • •
The travel end position trend is used to detect
an alternating zero point or a creeping zero
point shift due to seat and plug wear or dirt
between the seat and plug.
Data are recorded in the background re-
gardless of the operating mode selected if
the tight-closing function (Code 14) is active.
Data logging does not need to be activated.
The course of end position records the valve
position x and the drive signal y together
with the time stamp by the operating hours
counter when the valve moves to the lower
end position. The new recorded valve posi-
tion is compared to the last saved zero point.
If it differs by the 'Recording threshold' from
the last value, the data of the new zero point
are saved.
A graph of the recorded valve positions at
the lower end position is plotted over the
number of measurements.
The positioner saves the valve positions in a
circular buffer, which holds 30 measured
values at one time. The recorded measured
data are listed in the 'Lower end position'
folder.
Fig.8: Diagnosis > Statistical information > Trend of travel end position
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