Charact - Characteristic Curve; Action - Direction Of Action (Setpoint Signal); Shut_Cls - Shut-Off Value 0; Shut-Opn - Shut-Off Value 100 - ABB TZIDC Manual

18 TZIDC, TZIDC-200 DIGITAL POSITIONER | COI/TZIDC/TZIDC-200-EN REV. B
... 3 Configuration
... Parameter group 2: Set point
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
ACTION – direction of action (setpoint signal)
The direction of action describes the relationship between the
analog set point and pneumatic output OUT1.
Increasing Set point 0 to 100%  Output 0 to 100%
Decreasing Set point 0 to 100%  Output 100 to 0%
Selection
DIRECT
Increasing
Setpoint signal 4 to 20 mA, or
Set point 0 to 100 % = Position 0 to 100 %
REVERSE Decreasing
Setpoint signal 20 to 4 mA, or
Set point 100 to 0 % = Position 0 to 100 %
SHUT_CLS – Shut-off value 0 %
The shut-off value SHUT_CLS is a percentage of the operating
range (with one decimal place) from which the 0 % position is
approached. Once the specified position limit value is reached,
the actuator moves into the 0% end position.
As a result, the valve is moved in control mode into the
mechanical 0% end position through full evacuation or
ventilation.
In the 0 % end position, it continues to be adjusted to the
position setpoint.
SHUT-OPN – Shut-off value 100 %
The shut-off value SHUT_OPN is a percentage of the operating
range (with one decimal place) from which the 100 % position is
approached. Once the specified position limit value is reached,
the actuator moves into the 100% mechanical end position.
In the 100 % end position, it continues to be adjusted to the
position setpoint.
When entering a value, the valve is moved in control mode into
the mechanical 100% end position through full evacuation or
ventilation.
Settings for Autoadjust:
Rotary actuators When the limit value is reached, the actuator is fully
= 99 ventilated.
Linear actuators
Controlling continues in the 100% position.
= 100