Siemens SIPART PS2 Operating Instructions Manual page 172

Parameter assignment
8.3 Description of parameters
Factory setting:
C2.FACT1 - Factor 1
Adjustment range:
Purpose:
Factory setting:
C3.FACT2 - Factor 2
Adjustment range:
Purpose:
Factory setting:
172
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 263) 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 described
below.
30.0
0.1 ... 100.0
Use this sub-parameter to set the factor for formation of threshold 1.
Set the factor in a range from '0.1' to '100.0'. The threshold is the
product of 'C1.LIMIT' and 'C2.FACT1'.
A leakage was detected when threshold 1 is exceeded. The control
quality is not affected. The threshold 1 message is shown. This
message is only output if threshold 2 or 3 is not exceeded at the
same time.
The process to activate and display this message is described in the
'XDIAG' parameter.
1.0
0.1 ... 100.0
Use this sub-parameter to set the factor for formation of threshold 2.
Set the factor in a range from '0.1' to '100.0'. The threshold is the
product of 'C1.LIMIT' and 'C3.FACT2'.
A leakage was detected when threshold 2 is exceeded. The control
quality is affected. Maintenance is recommended. The threshold 2
message is shown. This message is only output if threshold 3 is not
exceeded at the same time.
The process to activate and display this message is described in the
'XDIAG' parameter.
1.5
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC