Condition: The '52.XDIAG' Activating for extended diagnostics (Page 162) pa‐
rameter is set to 'On1', 'On2' or 'On3'.
Operating mode 'Automatic' (AUT) is set for the leakage compen‐
sation.
Possible settings: ● OFF
● On
Purpose: 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 pa‐
rameter 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 227), Diagnostic value '58.LKPER - Period of the leak‐
age compensation pulse' (Page 227)
The leak monitoring is carried out in three stages for all control
phases (dynamic and static setpoints).
The current value of the monitoring is displayed in Diagnostic value
'16.ONLK - Pneumatic leakage' (Page 220).
Factory setting: OFF
C1.LIMIT - Limit
Adjustment range: 0.1 ... 100.0
Purpose: 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 cali‐
brated in such a way during the initialization (section Commission‐
ing (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
8.4 Description of parameters
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE 171
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