Tsup' Setpoint Ramp Up / '8.Tsdo' Setpoint Ramp Down; Sfct' Setpoint Function - Siemens SIPART PS2 Operating Instructions Manual

Parameter assignment
9.3 Description of parameters
9.3.2.2

'7.TSUP' Setpoint ramp UP / '8.TSDO' Setpoint ramp DOWN

Possible settings:
Purpose:
Factory setting:
9.3.2.3

'9.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
Inverse equal percentage
Freely adjustable
158
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 actuating
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 description
of the "'10.SL0' ... '30.SL20' Setpoint turning point (Page 159)" pa‐
rameter are simulated for linear valve characteristics.
Lin
1:25
1:33
1:50
25:1
33:1
50:1
With "TSDO"
● 0 ... 400
Set with parameter value
Lin
1-25
1-33
1-50
n1-25
n1-33
n1-50
FrEE
SIPART PS2 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00127926-AB