Siemens SIPART PS2 6DR50xx Manual page 113

C. LEAK
C1.LIMIT
C2.FACT1
C3.FACT2
C4.FACT3
SIPART PS2 Manual
A5E00074631--06
Pneumatic leakage
This parameter is used to activate the function for the detection of a
pneumatic leakage. To do so, the changes of position and the internally
used controller output are recorded and filtered, depending on the
direction. The filter result provides a coefficient that allows the detection
of any leakage.
Note that the detection of a leak can only provided clear results for
spring-loaded actuators.
Limit for the leakage indicator
Sets the limit for the leakage indicator The leakage indicator is scaled
within the range of 0.0 to 100.0. Factory setting for the limit is 30.0.
In other words, there is leakage below this limit. A leak can be
expected if this value is exceeded.
To be able to make full use of the sensitivity of the detection process,
it is recommended to perform a ramp test with a calibrator after the
automatic initialization of the device. The ramp should cover the
standard operating range of the valve and correspond in steepness to
the approximate dynamic requirements of the application. During the
ramp test, parameter 15.ONLK of the diagnosics menu provides
information on the values shown by the leakage indicator. This allows
the limit for the leakage coefficient to be defined above the maximum
ramp test value.
Factor 1
Input of the factor for the threshold 1 error message. This factor refers
to the limit for the leakage indicator. Factory setting for factor 1 is 1.0.
That means, for C1.LIMIT = 30.0 and factor 1 = 1.0, the first leakage
error message is triggered at a leakage indication of 30.0.
Factor 2
Input of the factor for the threshold 2 error message. This factor refers
to the limit for the leakage indicator. Factory setting for factor 2 is 1.5.
That means, for C1.LIMIT = 30.0 and factor 2 = 1.5, the second
leakage error message is triggered at a leakage indication of 45.0.
Factor 3
Input of the factor for the threshold 3 error message. This factor refers
to the limit for the leakage indicator. Factory setting for factor 3 is 2.0.
That means, for C1.LIMIT = 30.0 and factor 3 = 2.0, the third leakage
error message is triggered at a leakage indication of 60.0.
Operation
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