Siemens SIPART Series Operating Instructions Manual page 178

Parameterizing/addressing
9.4 Description of parameters
9.4.3 Description of parameters A through P
9.4.3.1 Description of parameter A
A. PST - partial stroke test
Use this parameter to activate the partial stroke test for cyclic or manual testing of
open/closed and control valves. Set the "On" parameter value to activate the test. Sub-
parameters are displayed. If the sub-parameters are set to the desired parameter values,
initiate the partial stroke test using:
● Buttons on the device
● A binary input
● Communication
● A cyclic test interval
Sub-parameters are described below.
The factory setting is "OFF".
A1.STPOS - starting position
Use this sub-parameter to define the starting position of the partial stroke test in percent. To
this end, set the starting position within a range from "0.0" to "100.0".
The factory setting is "100.0".
A2.STTOL - starting tolerance
Use this sub-parameter to define the starting tolerance of the partial stroke test in percent.
Set the starting tolerance relative to the starting position in a range from "0.1" to "10.0".
Example: You have set 50% as a starting position and 2% as a starting tolerance. In this
case, a partial stroke test is initiated during operation only between a current position of 48
and 52%.
The factory setting is "2.0".
A3.STEP - stroke magnitude
Use this sub-parameter to define the stroke magnitude of the partial stroke test in percent.
To this end, set the stroke magnitude within a range from "0.1" to "100.0".
The factory setting is "10.0".
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SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11