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stroke test that are determined from the "A6.PSTIN" reference step 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 digital display. The degree of the fault message is simultaneously
displayed using the fault message output or alarm outputs depending on the mode of the
advanced diagnostics.
10 General control valve fault
The monitoring of the operational response 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 set thresholds that are determined from the "b2.LIMIT" limit
multiplied by the factors "b3.FACT1" to "b5.FACT3".
11 Pneumatic leakage
This fault message appears when the leakage indicator exceeds the set 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").
12 Static friction/slipstick effect is too large
If the static friction of the control valve increases during operation or more Slipjumps are
detected, it may exceed the corresponding limits and lead to this fault message.
13 Temperature undershot
This fault message appears when the lower limit temperature thresholds are undershot.
14 Temperature overshot
This fault message appears when the upper limit temperature thresholds are overshot.
15 Monitoring of the position average
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 set thresholds.
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
Alarm, fault and system messages
12.3 Online diagnostics
235
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