10 EB 8389-1S EN
Description
NOTICE
Kp level changes affect the set point
deviation.
After changing the proportional-action coef-
cient 'Kp level', we recommend to recali-
brate the ne lter in the positioner. Use the
'Fine-tuning after Kp change' function for
this.
Start-up > Control parameters
− Proportional-action coefcient Kp level
(Code 17): 0 to 17, [7]
− Derivative-action time Tv level (Code 18): Off, 1
to 4, [2]
− Fine-tuning after Kp change
1.3 Diagnostic functions
There are two different types of diagnostic
functions:
1. Monitoring functions
Data are compiled, saved and analyzed
by the positioner while the process is
running without disrupting the process.
The positioner follows the set point to po-
sition the valve. A classied status alarm
or fault alarm is generated if the posi-
tioner detects an event.
2. Dynamic tests
Similar to the monitoring function, data
are compiled, saved and analyzed by
the positioner. However, in this case, the
valve position is not determined by the
set point, but by the settings of the test.
The dynamic tests can only be started
when the conditions in the plant allow it
(e.g. plant shutdown or service work in
the workshop). For reasons of safety, the
dynamic tests, except for partial stroke
testing, can only be performed in the
MAN operating mode.
A dynamic test is stopped and the posi-
tioner changes to the fail-safe position
when the electrical signal falls below a
certain level or when the solenoid valve
is triggered or the forced venting func-
tion is activated.
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