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Alarm, error, and system messages
10.3 Online diagnostics
10.3.4.7
8 Monitoring deadband
If the deadband increases disproportionately when adjusting it automatically ("DEBA"=Auto
parameter), it indicates an error in the system (e.g. severely increased packing gland friction,
play in the position displacement sensor, leakage). A limit can therefore be entered for this
value ("E1.LEVL3", threshold for deadband monitoring). An error message output is
activated when this value is exceeded.
10.3.4.8
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, this fault message appears when one of the three thresholds of the partial
stroke test that are determined from the "A6.PSTIN" reference stroke time multiplied by
factors "A7.FACT1" to "A9.FACT3" is violated. The degree of the fault message is shown in
the number of columns on the display. The degree of the fault message is simultaneously
displayed using the fault message output or alarm outputs depending on the mode of the
extended diagnostics.
10.3.4.9
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 reference variable 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".
10.3.4.10
11 Monitoring the pneumatic leakage
This fault message appears when the leakage indicator exceeds the configured thresholds.
Keep in mind that the complete sensitivity of this function can be used only if a ramp
movement was initiated after initialization to set the leakage indicator (see explanations for
"C1.LIMIT").
10.3.4.11
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.
10.3.4.12
13 Monitoring the lower limit temperature
This fault message appears when the lower limit temperature thresholds are undershot.
10.3.4.13
14 Monitoring the upper limit temperature
This fault message appears when the upper limit temperature thresholds are overshot.
228
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
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