Purpose: This parameter is used to drive the control valve to the mechanical
stops. If the parameter is not activated, the control valve controls
the two positions which were determined during the initialization.
With tight closing, the control valve requires longer to leave the
stops. With fast closing, the stops of the control valve are left im‐
mediately.
The tight closing and fast closing functions are activated on one
side or for both stops. Parameter 'YCLS' becomes effective if the
effective setpoint:
● Is at or below the value set in the ''37.YCDO' Value for tight
closing/fast closing Down (Page 151)' parameter.
● Is at or above the value set in the ''38.YCUP' Upper value for
tight closing / fast closing (Page 152)' parameter.
Factory setting: no
See the figure in the description of the '34.YNRM' Manipulated variable standardization
(Page 149) parameter and the figure in the description of the '10.SL0' ... '30.SL20' Setpoint
turning point (Page 147) parameters.
Note
Activated tight closing/fast closing function
If the function is activated, then the monitoring of control deviation is turned off in the respective
overflow direction for the ''46.\\LIM' Response threshold of fault message 'Control deviation'
(Page 157)' parameter. The following applies: 'YCDO: < 0 %' and 'YCUP: > 100 %'. This
functionality is especially advantageous for valves with lining. For long-term monitoring of the
position of the stops, we recommend that you activate the 'F. ZERO' and 'G. OPEN'
parameters.
8.3.2.10 '37.YCDO' Value for tight closing/fast closing Down
Requirement: Parameter '36.YCLS (Page 150)' is set to 'do', 'uP do', 'Fd', 'Fu Fd',
'uP Fd' or 'Fu do'
Adjustment range: 0.0 ... 100.0
Purpose: Use the parameter '37.YCDO' to set the value as of which the "Tight
closing/fast closing Down" function is activated. If the effective set‐
point is at or below the value set here, the actuator moves in tight
closing Down or fast closing Down.
Factory setting: 0.0
Note
The value in the parameter "37.YCDO" is always smaller than that in "38.YCUP (Page 152)".
The tight closing function has a fixed hysteresis of 1%. The parameter "37.YCDO" refers to the
mechanical stops. "37.YCDO" is independent of the value that is set in the parameters "6.SDIR
(Page 145)" and "35.YDIR (Page 150)".
Parameter assignment
8.3 Description of parameters
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC 151
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