ABB PositionMaster EDP300 Operating Instruction page 38

Mask contents Value range
TV Up 10 ... 800 ms
TV Down 10 ... 800 ms
Y-Offset Up 1 ... 100.0 %
Y-Offset Down 1 ... 100.0 %
IMPORTANT (NOTE)
In the case of most actuators, all control parameters can be optimized by using Autoadjust. The parameters should
only be changed if Autoadjust cannot be executed or does not result in satisfactory control behavior.
38 OI/EDP300-EN | PositionMaster EDP300
Description
The TV value is the derivative time of the controller.
The control speed and stability are affected by the TV value in such a way that it counteracts the
KP value dynamically. The control speed decreases as the TV value increases.
To compensate for existing dissymmetries in the controlled system, the TV value should be
configured separately for both positioning directions (up / down).
Use this parameter to adjust the TV value for the up positioning direction (towards 100 %).
The TV value is the derivative time of the controller.
The control speed and stability are affected by the TV value in such a way that it counteracts the
KP value dynamically. The control speed decreases as the TV value increases.
To compensate for existing dissymmetries in the controlled system, the TV value should be
configured separately for both positioning directions (up / down).
Use this parameter to adjust the TV value for the down positioning direction (towards 0 %).
The "offset for the setpoint 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 (lower measuring range 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 ... 80 %. If, in the event of setpoint 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 up positioning direction (towards 100 %).
The "offset for the setpoint 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 setpoint 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 %).