EB 8389 EN
49
Statistical information
4.6 Drive signal diagram
steady-state
3730-2 3730-3 3731-3 3730-4 3730-5 3731-5
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The 'Drive signal diagram steady-state' re-
cords the drive signal y in relation to the
valve position x.
The drive signal y is based on the internal
control signal of the i/p converter. This sig-
nal runs directly proportional to the signal
pressure p
out
in the pneumatic actuator, in re-
lation to the valve position.
This test helps pinpoint faults in the supply
pressure, pneumatics or actuator springs.
Data are recorded in the background re-
gardless of the operating mode selected. Da-
ta logging does not need to be activated.
The positioner records the
valve position x
and its associated
drive signal y
in closed-
loop operation after the pressure conditions
have settled (steady-state). Each pair of mea-
sured values recorded is assigned to a valve
position class. The average drive signal is
calculated for each class. The stored data
can be read out. The drive signal y is plotted
in a graph against the
valve position x
.
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Reference values are used in cases where
no data could be compiled for valve
positions x as the valve did not move to
those positions or a steady state could not
be reached.
Note
Fig. 6:
Diagnosis > Statistical information > Drive signal diagram > Steady-state
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