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Parameterizing/addressing
9.4 Description of parameters
9.4.3.6
Monitoring the lower endstop "F._ZERO"
F. ZERO - Monitoring the lower endstop
Note
Fault detection
Monitoring the lower endstop not only responds to faults in the valve. If the limit thresholds of
the lower endstop are exceeded due to misalignment of the position feedback, the
misalignment also triggers a diagnostics message.
Requirement:
Possible settings:
Purpose:
Factory setting:
188
The "'52.XDIAG' Activating for extended diagnostics (Page 174)"
parameter is set to "On".
• OFF
• On
Use this parameter to activate continuous monitoring of the lower
endstop. The monitoring is executed whenever the valve is in the
"down tight closing" position. It checks whether the lower endstop
has changed compared to its value during initialization.
Configure the following settings to activate the function:
1. Ensure that the "'39.YCLS' Tight closing with manipulated
variable (Page 166)" parameter is set to "do" or "uP do".
2. Set the "F. ZERO" parameter to "On". Sub-parameters are
displayed. Monitoring is activated.
3. Set the suitable parameter values in sub-parameters. The
setting options available in sub-parameters are described
below.
The current value is displayed in "Diagnostics parameter
'18.ZERO' Lower endstop (Page 214)". The positioner triggers a
fault message if the current value exceeds one of the three config-
urable limit thresholds.
If the value undershoots a threshold, the fault message is saved in
a power fail-safe manner until:
• A fault no longer occurs.
• The device is re-initialized.
• The "F. ZERO" parameter is deactivated.
Sub-parameters are described below.
OFF
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
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