12.3.4.8 9 Partial stroke test
On the one hand, this fault message appears when a manual or cyclic partial stroke test is
initiated and the test cannot be started since the valve is not within the starting tolerance. On
the other hand, the fault message appears when one of the three thresholds of the partial stroke
test that are determined from the 'A9.PSTIN' reference stroke time multiplied by factors
'AA.FACT1', 'Ab.FACT2' and 'AC.FACT3' is violated. The severity of the fault message is
shown by the number of bars on the display. The severity of the fault message is simultaneously
displayed using the fault message output or alarm outputs depending on the mode of the
advanced diagnostics.
12.3.4.9 10 Monitoring of dynamic control valve behavior
The monitoring of the operational behavior responds when the actual valve position shifts from
a narrow corridor between the setpoint and the expected position course. In this case, the
deviation between the expected and actual position course is filtered, displayed and compared
with the configured thresholds that are determined from the "b2.LIMIT" limit multiplied by the
factors "b3.FACT1" to "b5.FACT3".
12.3.4.10 11 Monitoring/compensation of pneumatic leakage
This fault message appears if a leakage is present. For additional information, see Monitoring/
compensation of pneumatic leakage 'C.\\LEAK' (Page 170).
12.3.4.11 12 Monitoring of stiction (slipstick)
If the stiction of the control valve increases during operation or if an increasing number of
Slipjumps is detected, "d1.LIMIT" could be exceeded and result in this fault message.
12.3.4.12 13 Monitoring the lower limit temperature
This fault message appears when the lower limit temperature thresholds are undershot.
12.3.4.13 14 Monitoring the upper limit temperature
This fault message appears when the upper limit temperature thresholds are overshot.
12.3.4.14 15 Monitoring the position average value
This fault message appears when a position value calculated after the expiry of a comparison
interval deviates from the reference value by more than the configured thresholds.
12.3.4.15 16 Monitoring the plausibility of values for the partial stroke test
This error message is triggered if, when starting a partial stroke test, the plausibility check of the
"A1.STPOS", "A3.STRKH" and "A4.STRKD" parameters was not successful.
Diagnostics and troubleshooting
12.3 Online diagnostics
SIPART PS2 with PROFIBUS PA
276 Operating Instructions, 05/2019, A5E00127926-AC
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