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10.3.4.4
4 Monitoring the number of total strokes
The diagnostics value "1 STRKS" is constantly compared with the thresholds that are
determined from the "L1.LIMIT" to "L4.FACT3" parameters. If the thresholds are exceeded,
the fault message output or the alarm outputs respond depending on the mode of the
extended diagnostics. These two functions can be deactivated using the parameter setting
"OFF" for "L. STRK".
10.3.4.5
5 Monitoring the number of changes in direction
The diagnostics value "2 CHDIR" is constantly compared with the thresholds that are
determined from the "O1.LIMIT" to "O4.FACT3" parameters. If the thresholds are exceeded,
the fault message output or the alarm outputs respond depending on the mode of the
extended diagnostics. These two functions can be deactivated using the parameter setting
"OFF" for "O. DCHG".
10.3.4.6
6 Monitoring the lower endstop / 7 Monitoring the upper endstop
If the parameter "F. ZERO" is set to "ON", monitoring of the lower endstop is activated. This
function can be used to detect the errors in the valve seat. An overshot limit indicates the
possibility of deposits or foreign bodies in the valve seat. An undershot limit indicates
probable wear and tear of the valve seat or flow restrictor. Even a mechanical misalignment
of the position feedback can trigger this fault message.
Monitoring is always carried out whenever the valve is in the "down tight closing" position.
The current position is compared with the position that was determined as the lower endstop
at the time of initialization. The activation of "down tight closing" ("YCLS" parameter) is
therefore the condition.
Example: A value of 3% is set. The position is normally adopted for "down tight closing". A
fault is reported if a value > 3% or < -3% is determined instead.
The fault message remains activated until either a subsequent monitoring remains within the
tolerance or a re-initialization process is executed. Even the deactivation of monitoring ("F.
ZERO"=OFF) may trigger an error message.
This monitoring function does not deliver any utilizable results if the end stops were not
determined automatically at the time of initialization, but the limits were set manually (manual
initialization, "5.INITM").
Similar diagnostics is carried out for the upper endstop. The "G. OPEN" parameter is used
to set the limit for this. The activation of "up tight closing" ("YCLS" parameter) is therefore the
condition.
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
Alarm, error, and system messages
10.3 Online diagnostics
227
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