Operating instructions

Parameterizing/addressing
10.4 Description of parameters
SIPART PS2 with and without HART communications
Operating Instructions, 09/2008, A5E00074631-08
153
10.4.2.10 Description of parameters 38
38.YDIR - Direction of manipulated variable for display
This parameter is used to set the direction of action of the display and the position feedback
I
Y
. The direction can be rising or falling.
The factory setting is "riSE".
10.4.2.11 Description of parameters 39
39.YCLS - Manipulated variable tight closing
This parameter is used to move the valve into its seat with the maximum force of the
actuator (permanent contact of the piezo valves). The tight closing function is activated on
one side or for both end positions. The parameter "39.YCLS" becomes effective if the
effective setpoint is below the parameter "40.YCDO" or above the parameter "41.YCUP".
See figure in
Description of param
eters 37 (Page 151) and figure in Description of
parameters 13 through 33 (Page 150).
Note
Activated tight closing function
If the tight closing function is activated, then for parameter "49.
LIM" the monitoring of
regulation deviation is turned off in the appropriate overflow direction. Here, "YCDO: < 0 %"
and "YCUP: > 100 %" apply. This functionality is especially advantageous for valves with soft
seats. For a long-term monitoring of the end stop positions, we recommend activating the
parameters "F.
ZERO" and G. OPEN".
The factory setting is "no".
10.4.2.12 Description of parameters 40 and 41
40.YCDO - Lower value for tight closing
The factory setting is "0.5".
and