IM-S51-07 CTLS Issue 1
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SP7-10, SP7-11, SP7-12 and SP7-20, SP7-21, SP7-22 Parameterization
3.11.5 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 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 %.
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 ... 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 tolerance band.
Use the parameter Y-OFS UP to adjust the Y offset for the upward positioning direction (towards 100 %).
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