Using PID_3Step
5.2 PID_3Step V2
PID control
Function Manual, 03/2017, A5E35300227-AC
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The value specifies the proportional gain of the controller. PID_3Step does not work with a
negative proportional gain. Control logic is inverted under Basic settings > Controller type.
The integration time determines the time behavior of the integral action. The integral action is
deactivated with integration time = 0.0.
The derivative action time determines the time behavior of the derivative action. Derivative
action is deactivated with derivative action time = 0.0.
Derivative delay coefficient
The derivative delay coefficient delays the effect of the derivative action.
Derivative delay = derivative action time × derivative delay coefficient
● 0.0: Derivative action is effective for one cycle only and therefore almost not effective.
● 0.5: This value has proved useful in practice for controlled systems with
dominant
time constant.
● > 1.0: The greater the coefficient, the longer the effect of the derivative action is delayed.
Proportional action weighting
The proportional action may weaken with changes to the setpoint.
Values from 0.0 to 1.0 are applicable.
● 1.0: Proportional action for setpoint change is fully effective
● 0.0: Proportional action for setpoint change is not effective
The proportional action is always fully effective when the process value is changed.
Derivative action weighting
The derivative action may weaken with changes to the setpoint.
Values from 0.0 to 1.0 are applicable.
● 1.0: Derivative action is fully effective upon setpoint change
● 0.0: Derivative action is not effective upon setpoint change
The derivative action is always fully effective when the process value is changed.
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