ABB 3HAC9710-1

ABB 3HAC9710-1

Important 

All control parameters are determined in an optimum way for most actuators during Autoadjust. Changes should only be made when Autoadjust cannot be executed or control stability cannot be achieved. 

The "offset for the output signal" linearizes the response of the I/P module used and enables fast control even for small control deviations. 

The value is limited a the low end by a minimum value (neutral zone) The offset substantially affects the controlling speed for control deviations smaller 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 dissymmetries in the controlled system, the offset should be set separately for both directions (up/down). 

For most actuators, satisfactory control is achieved with offset values between 40 and 80%. If the control stability for setpoint changes is less than 2% overshoot, both offset values should be decreased. 

Both offset values should be increased when the actuator stops outside the tolerance band. 

You can use parameter Y-OFS UP to adjust the Y offset for the positioning direction up (towards 100 %).

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