2
Statistical information AUTO
The signals x, w and y need to be analyzed
on a more precise basis to obtain advanced
diagnostic information also over the valve,
actuator and pneumatic air supply. The
positioner compiles raw data for this pur-
pose.
The signals are plotted, stored and analyzed
while the process is running. In addition, an
additional underlayed hysteresis test detects
any changes in friction.
The diagnostic tests do not have any affect
on the positioner’s control performance.
2.1
Data logger
The data logger allows the reference vari-
able w, controlled variable x in relation to
the working range, drive signal y and
setpoint deviation e to be plotted over time.
The measured data are saved in an FIFO
memory with a capacity to save 100 data
points in the positioner.
In addition to the permanent plotting of
data, the plotting can be automatically trig-
gered when a start condition is fulfilled. The
travel condition (setpoint) or the optional in-
tegrated solenoid valve (optional integrated
forced venting) can be used to trigger the
data logger.
The data logger is completely integrated into
the positioner.
The software is only necessary for activation
and to set the parameters.
In addition, the measured data can be
viewed as a graph or in a list by selecting
Upload from Device
in the
Device
menu or
by clicking
on the device toolbar.
Note!
Upon disconnection of the auxiliary
power or upon changing the operating
mode, the test is inactive and must be reacti-
vated.
Data logging
Select
Data logger
folder (>
Selection
) and
select
Permanent
or
Trigger
and set the
Scan
rate
parameter. Right-click the
Start data
EB 8388 EN
9
Statistical information AUTO
Fig. 2 · Statistical information AUTO
