Siemens SIPART PS2 series User Manual

8.4.3.6 Monitoring of lower endstop 'F.\\ZERO'
F. ZERO - Monitoring of lower endstop
Note
Fault detection
Monitoring of 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: The '52.XDIAG' Activating for extended diagnostics (Page 162) pa‐
rameter is set to 'On1', 'On2' or 'On3'.
The '39.YCLS' Tight closing/fast closing with manipulated variable
(Page 153) parameter is set to one of the following values: 'do',
'uP do', 'Fd', 'Fu Fd', 'uP Fd', 'Fu do'.
Possible settings: ● OFF
● On
Purpose: Use this parameter to activate continuous monitoring of the lower
endstop. Monitoring is always carried out if the '39.YCLS' Tight
closing/fast closing with manipulated variable (Page 153) parame‐
ter is set to one of the following values: 'do', 'uP do', 'Fd', 'Fu Fd',
'uP Fd', 'Fu do'
It checks whether the lower endstop has changed compared to its
value during initialization. Monitoring is performed in three steps.
Set the following sub-parameters appropriately. To activate moni‐
toring, set the parameter to 'On'. Sub-parameters are displayed.
The current value is displayed in Diagnostic value '18.ZERO - Low‐
er endstop' (Page 220). The positioner triggers a message if the
current value undershoots one of the three thresholds.
Factory setting: OFF
F1.LEVL1 - threshold 1
Adjustment range: 0.1 ... 10.0
Purpose: Use this sub-parameter to set threshold 1 for the lower endstop in
percent. Set the threshold in a range from '0.1' to '10.0'.
The positioner triggers a threshold 1 message if the difference be‐
tween the lower endstop and the initialization value undershoots
threshold 1. This message is only output if threshold 2 or 3 is not
unsershot at the same time. The process to activate and display this
message is described in the 'XDIAG' parameter.
Factory setting: 1.0
Parameter assignment
8.4 Description of parameters
SIPART PS2 with 4 to 20 mA/HART
176 Operating Instructions, 11/2019, A5E00074631-AE

Siemens SIPART PS2 series Specifications

General

Brand	Siemens
Model	SIPART PS2 series
Category	Valve Positioners
Language	English