Y-Ofs Up - Y Offset (Up); Y-Ofs Dn - Offset (Down) - ABB TZIDC Manual

30 TZIDC, TZIDC-200 DIGITAL POSITIONER | COI/TZIDC/TZIDC-200-EN REV. B
... 3 Configuration
... Parameter group 7: Controller parameters
Y-OFS UP – Y offset (up)
Note
In the case of most actuators, all control parameters can be
optimized by using Auto Adjust. Changes should only be made
when auto adjust cannot be executed or control stability cannot
be achieved.
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 %.
In manual modes MANUAL and MAN_SENS, the offset values are
issued to the I/P module for fine adjustment. With larger, slower
actuators, Autoadjust may determine offset values higher than
80 %. In these cases there will be no noticeable difference
between fine and coarse adjustment while in manual mode.
To compensate for existing asymmetries 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 tolerance band.
Use the Y-OFS UP parameter to adjust the Y-offset for the up
positioning direction (towards 100 %).
Y-OFS DN – Offset (down)
Note
In the case of most actuators, all control parameters can be
optimized by using Auto Adjust. Changes should only be made
when auto adjust cannot be executed or control stability cannot
be achieved.
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 %.
In manual modes MANUAL and MAN_SENS, the offset values are
issued to the I/P module for fine adjustment. For larger, slower
actuators Autoadjust may determine values higher than 80%. In
these cases there will be no noticeable difference between fine
and coarse adjustment while in manual mode.
To compensate for existing asymmetries 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 tolerance band.
Use the Y-OFS DN parameter to adjust the Y-offset for the down
positioning direction (towards 0 %).