An alarm is generated after a change in
zero point or when a zero point shift outside
of the zero point limit is detected.
Enter the zero point limit in the
Positioner
folder (>
Error control
>
Zero point limit
) or
over Code 48 in the positioner, selecting d5
(default setting 5 %).
Note!
The valve end position is also logged when
the valve moves to the fail-safe position over
the forced venting option and with an
actuator with AIR TO OPEN.
Graph versions
Select
Trend of valve end position
folder to
view a graph of the recorded end positions.
The reference value is represented by a
straight line in the graph.
The graph highlights a trend and a change
in the end position.
The
Lower end position
folder contains a
table of the measured data (valve position x,
drive signal y) with time stamp.
Data and the reference value can be reset in
the
Status messages
(
> Reset
) folder.
20
EB 8388 EN
Statistical information AUTO