Tsup' Setpoint Ramp Up / '11.Tsdo' Setpoint Ramp Down; Sfct' Setpoint Function - Siemens SIPART PS2 Operating Instructions Manual

9.4.2.4

'10.TSUP' Setpoint ramp UP / '11.TSDO' Setpoint ramp DOWN

Possible settings:
Purpose:
Factory setting:
9.4.2.5

'12.SFCT' Setpoint function

Possible settings:
Purpose:
Factory setting:
Seven valve characteristics are stored in the positioner and are selected using the "SFCT"
parameter:
Valve characteristics
Linear
Equal percentage
Equal percentage
Equal percentage
Inverse equal percentage
Inverse equal percentage
SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB
With "TSUP"
• Auto
• 0 ... 400
The setpoint ramp is effective in "Automatic" mode and limits the
speed of change of the effective setpoint. This parameter is used
to set the value in seconds. When switching over from "Manual"
mode to "Automatic" mode, the setpoint ramp is used to adjust the
effective setpoint to the setpoint of the positioner.
This smooth switching from "Manual" mode to "Automatic" mode
prevents pressure excess in long pipelines.
The parameter "TSUP = Auto" means the slower of the two actuat-
ing times determined during initialization is used for the setpoint
ramp. Parameter value "TSDO" then has no effect.
0
• Lin
• 1 - 25
• 1 - 33
• 1 - 50
• n1 - 25
• n1 - 33
• n1 - 50
• FrEE
This parameter is used to linearize nonlinear valve characteristics.
Optional flow characteristics as shown in the figure in the descrip-
tion of the "'13.SL0' ... '33.SL20' Setpoint turning point (Page 162)"
parameter are simulated for linear valve characteristics.
Lin
1:25
1:33
1:50
25:1
33:1
Parameter assignment
9.4 Description of parameters
With "TSDO"
• 0 ... 400
Set with parameter value
Lin
1-25
1-33
1-50
n1-25
n1-33
161