Siemens SIPART PS2 Operating Instructions Manual page 184

Parameter assignment
9.4 Description of parameters
Requirement:
Possible settings:
Purpose:
Factory setting:
C1.LIMIT - Limit for leakage indicator
Adjustment range:
Purpose:
Factory setting:
184
The '52.XDIAG' Activating for extended diagnostics (Page 174)
parameter is set to 'On1', 'On2' or 'On3'.
• OFF
• On
Use this parameter to detect leakages in the actuator or in the pipe
installation. Monitoring is performed in three steps. To activate
monitoring, set the parameter to 'On'. Sub-parameters are dis-
played. Appropriately set the sub-parameters.
The current value is displayed in Diagnostic value '16.ONLK -
Pneumatic leakage' (Page 216). The positioner triggers a message
if the current value exceeds one of the three thresholds.
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 cali-
brated in such a way during the initialization (see section Commis-
sioning (Page 113)) that the leakage indicator remains below the
value 30. If a value above 30 is displayed, this means that a leak-
age exists. '30.0' is therefore an advisable setting for the parame-
ter. After a certain time this limit can be varied slightly depending
on the application.
To optimize the sensitivity of the monitoring of the pneumatic leak-
age to your specific application, follow these steps:
1. After initializing the positioner automatically, use a calibration
device to initiate a ramp movement.
2. Conditions for the ramp movement:
– The ramp covers the normal operating range of the valve.
– The steepness of the ramp matches the dynamic
requirements of the corresponding application.
– The characteristic of the ramp corresponds to the
characteristic of the setpoint that actually occurs.
3. During the ramp movement, the Diagnostic value '16.ONLK -
Pneumatic leakage' (Page 216) provides information about the
actual values. Define the limit of the leakage indicator
accordingly.
The positioner triggers a message if the current value exceeds one
of the three thresholds. How to set the three thresholds is de-
scribed below.
30.0
SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB