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

Parameter assignment
9.4 Description of parameters
AC.FACT3 - Factor 3
Adjustment range:
Purpose:
Factory setting:
9.4.3.2

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
Possible settings:
Purpose:
172
0.1 ... 100.0
Use this sub-parameter to set the factor for formation of threshold
3.
Set the factor in a range from '0.1' to '100.0'. The threshold is the
product of the reference stroke time and 'AC.FACT3'. The process
to determine the reference stroke time is described under
'A9.PSTIN'.
The threshold 3 message is displayed when threshold 3 is excee‐
ded. The process to activate and display this message is described
in the 'XDIAG' parameter.
The positioner responds in accordance with the option set in the sub-
parameter 'A7.FLBH'.
5.0
The '52.XDIAG' Activating for extended diagnostics (Page 166) 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 Diagnostics value '15.DEVI - Dy‐
namic control valve behavior' (Page 205). The positioner triggers a
message 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'.
SIPART PS2 with and without HART
Operating Instructions, 05/2017, A5E00074631-AC