Siemens SIPART PS2 Operating Instructions Manual page 175

Requirement:
Possible settings:
Purpose:
Factory setting:
C1.LIMIT - Limit
Adjustment range:
Purpose:
SIPART PS2 with and without HART
Operating Instructions, 05/2017, A5E00074631-AC
The '52.XDIAG' Activating for extended diagnostics (Page 166) pa‐
rameter is set to 'On1', 'On2' or 'On3'.
Operating mode 'Automatic' (AUT) is set for the leakage compen‐
sation.
● OFF
● On
This parameter is used to activate leak monitoring and leakage
compensation. Leakages mainly occur in the actuator or in the pipe
installation. To activate monitoring or compensation, set the param‐
eter to 'On'. Sub-parameters are displayed. Appropriately set the
sub-parameters.
The leakage compensation compensates the leakage in control
phases with constant setpoint. The control quality is increased by
reducing or preventing the typical, periodic oscillations of leaky
valves. The leakage compensation compensates leakages up to 2%
of the positioner's air performance.
The two following diagnostics values indicate the length and period
of the current leakage compensation pulse:
Diagnostic value '57.LKPUL - Length of the leakage compensation
pulse' (Page 213), Diagnostic value '58.LKPER - Period of the leak‐
age compensation pulse' (Page 213)
The leak monitoring is carried out in three stages for all control pha‐
ses (dynamic and static setpoints).
The current value of the monitoring is displayed in Diagnostic value
'16.ONLK - Pneumatic leakage' (Page 205).
OFF
0.1 ... 100.0
Use this sub-parameter to set the limit of the leakage indicator in
percent. Set the limit in a range from '0.1' to '100.0'. If no leakage
exists, monitoring of the pneumatic leakage is automatically calibra‐
ted in such a way during the initialization (section Commissioning
(Page 105)) that the leakage indicator remains below the value 30.
A value above 30 means that a leakage exists. '30.0' is therefore an
advisable setting for the parameter. After a certain time this limit can
be varied slightly depending on the application.
Parameter assignment
9.4 Description of parameters
175