Spirax Sarco SP7-10 - CHARACT: Characteristic Curve Configuration; ACTION: Setpoint Signal Direction

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IM-S51-07 CTLS Issue 1
SP7-10, SP7-11, SP7-12 and SP7-20, SP7-21, SP7-22 Parameterization
The direction of action describes the relationship between the analog setpoint and pneumatic output OUT1.
Increasing Setpoint 0 ... 100 % to Output 0 ... 100 %
Decreasing Setpoint 0 ... 100 % to Output 0 ... 100 %
Selection
DIRECT
Increasing
Control signal 4 ... 20 mA, and
setpoint 0 ... 100 % = position 0 ... 100 %
REVERSE
Decreasing
Control signal 20 ... 4 mA, and
setpoint 100 ... 0 % = position 0 ... 100 %
3.6.3 CHARACT – Characteristic curve
Use this parameter to select a function that adjusts the behavior of the positioner to the analog input signal according to a predefined
course.
This linearizes the characteristic curves for the valves and fittings and improves the behavior of the overall control loop.
In addition to five predefined characteristic curves, you can also select a user-configurable characteristic curve, which can only be
generated and saved in the device via a PC with the appropriate configuration program (and not locally).
Selection
LINEAR Linear
EP 1/25 equal percentage 1:25
EP 1/50 equal percentage 1:50
EP 25/1 equal percentage 25:1
EP 50/1 equal percentage 50:1
USERDEF configurable by user
USERDEF LINEAR
3.6.4 ACTION – Direction of action (setpoint signal)