Siemens SIPART Series - 9.4.3.6 Description of parameter F

Parameterizing/addressing
9.4 Description of parameters
SIPART PS2 with and without HART
186 Operating Instructions, 10/2013, A5E00074631-11
9.4.3.6
Description of parameter F
F. ZERO - zero point displacement
Note
Fault detection
The monitoring unit for the zero point displ
acement responds to the fault in the valve. If the
limit thresholds of the zero point displacement are exceeded due to misalignment of the
position feedback, the misalignment also triggers a diagnostics message.
Use this parameter to activate the test to monitor the zero point displacement. The test is
executed whenever the valve is in the "down tight closing" position. The test checks whether
the value of the lower end stop has changed with respect to its value at the time of
initialization (zero point P0).
Configure the following settings to activate the test:
1. Ensure that the parameter "YCLS" manipulated variable tight closing parameter is set to
values "do" or "uP do".
2. Set the "F.
ZERO" parameter to "On". Sub-parameters to set the test parameters are
displayed. The test is activated.
3. Set the suitable parameter values in sub-parameters. The setting options available in
sub-parameters are described below.
The current zero point displacement is displayed in the "17 ZERO" diagnostics parameter.
The positioner triggers a fault message if the current value undershoots a threshold.
If the value undershoots a threshold, the fault message is saved in a power fail-safe manner
until:
● No fault occurs during a repeat test.
● The device is re-initialized.
● The "F.
ZERO" parameter is deactivated.
The factory setting is "OFF".
F1.LEVL1 - threshold 1
Use this sub-parameter to set a threshold in percent. Use threshold 1 to monitor the lower
hard end stop. Set the threshold in a range from "0.1" to "10.0".
The positioner triggers a fault message if the difference between the lower hard end stop
and the initialization value undershoots threshold 1. The process to activate and display this
fault message is described in the "XDIAG" parameter.
The factory setting is "1.0".