ABB PositionMaster EDP300 Operating Instruction page 54

54 PositionMaster EDP300 DIGITAL POSITIONER | OI/EDP300-EN REV. D
... 9 Operation
... Parameter descriptions
Menu / parameter Value range
Device Setup / Setpoint (continued)
SP Charact. Curve Linear
1:25 AM
1:50 AM
25:1
50:1
Custom
SP Direction Direct
Reverse
Description
Use this parameter to select a function that adjusts the behavior of the positioner to the analog input
signal in accordance with 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).
Note
If the 'SP Charact. Curve' parameter is changed, any switching points for digital position feedback which
may have been set previously will shift in relation to the valve range.
The action describes the relationship between the analog set point and pneumatic output 1.
• Direct: Rising, set point 0 to 100 % -> output 0 to 100 %
• Reverse: Falling, set point 0 to 100 % -> output 100 to 0 %