ABB PositionMaster EDP300 Operating Instruction page 61

PositionMaster EDP300 DIGITAL POSITIONER | OI/EDP300-EN REV. D
Menu / parameter Value range
Controller (continued)
Y-Offset Up 1 to 100.0 %
Y-Offset Down 1 to 100.0 %
Note
In the case of most actuators, all control parameters can be optimized by using Auto Adjust. The parameters should only be changed
if Auto Adjust cannot be executed or does not result in satisfactory control behavior.
Description
Use this parameter to adjust the Y offset for the up positioning direction (towards 100 %).
The 'offset for the set point signal' linearizes the behavior of the I/P module used and enables rapid
compensation even in the case of small control deviations. The value is limited at the lower end by a
minimum value (measuring range lower limit).
The offset significantly affects the control speed for control deviations of less than 5 %.
To compensate for existing dissymmetries in the controlled system, the offset should be configured
separately for both positioning directions (up / down).
For most actuators, satisfactory control behavior is achieved with offset values between 40 and 80 %. If,
in the event of set point changes, the control behavior demonstrates an overshoot of less than 2 %, both
offset values should be decreased.
Both offset values should be increased when the actuator stops outside the dead band.
Use this parameter to adjust the Y offset for the down positioning direction (towards 0 %).
The 'offset for the set point signal' linearizes the behavior of the I/P module used and enables rapid
compensation even in the case of small control deviations. The value is limited at the lower end by a
minimum value (neutral zone).
The offset significantly affects the control speed for control deviations of less than 5 %.
To compensate for existing dissymmetries in the controlled system, the offset should be configured
separately for both positioning directions (up / down).
For most actuators, satisfactory control behavior is achieved with offset values between 40 ... 80 %. If, in
the event of set point changes, the control behavior demonstrates an overshoot of less than 2 %, both
offset values should be decreased.
Both offset values should be increased when the actuator stops outside the dead band.
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