Monitoring Of Dynamic Control Valve Behavior 'B.\\Devi - Siemens SIPART PS2 Operating Instructions Manual

9.3.3.2

Monitoring of dynamic control valve behavior 'b.\\DEVI'

b. DEVI - Monitoring of dynamic control valve behavior
Requirement:
Possible settings:
Purpose:
Factory setting:
b1.TIM - Time constant of low-pass filter
Possible settings:
Purpose:
Factory setting:
SIPART PS2 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00127926-AB
The '50.XDIAG' Activation of extended diagnostics (Page 170) pa‐
rameter is set to 'On1', 'On2' or 'On3'.
● OFF
● On
This parameter allows you to monitor the dynamic control valve be‐
havior. The actual position course is compared with the expected
position course for this purpose. This comparison helps in drawing
a conclusion about the correct operational response of the control
valve. Monitoring is performed in three steps. To activate monitoring,
set the parameter to 'On'. Sub-parameters are displayed. Appropri‐
ately set the sub-parameters.
The current value is displayed in Diagnostic value '15.DEVI - Gen‐
eral control valve fault' (Page 259). The positioner triggers a mes‐
sage if the current value exceeds one of the three thresholds.
OFF
● Auto
● 1 ... 400
Use this sub-parameter to define the attenuation effect of the low-
pass filter. The unit is seconds. The time constant 'b1.TIM' is calcu‐
lated from the travel times 'uP' and 'doWn' determined during the
initialization. This time constant becomes effective when the
'b1.TIM' parameter is set to 'Auto'.
If the time constant is inadequate, the setting of 'b1.TIM' can be
changed manually. Set the time constant in a range from '1' to '400'.
In this case:
● Setting '1' indicates a very weak attenuation.
● Setting '400' indicates a strong attenuation.
The currently determined deviation is displayed in Diagnostic value
'15.DEVI - General control valve fault' (Page 259). The positioner
triggers a message if the current value exceeds one of the three
parameterizable thresholds.
Auto
Parameter assignment
9.3 Description of parameters
179