Individual Functions
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PI Feedback Input Methods
Select one of the following PI control feedback input methods
If H3-09 is set to 16, the PI differential mode is activated. Both analog inputs (A1 and A2) become feedback
inputs and the difference between both (A1 - A2) becomes the feedback value for the PI controller. The moni-
tor U1-24 becomes the feedback 1 monitor, U1-53 becomes the feedback 2 monitor.
In PI differential mode the PI target value can be set using parameter b5-07 (PI offset or PI differential set-
point).
îš„PI Adjustment Examples
Suppressing Overshoot
If overshoot occurs, reduce Proportional gain (P), and increase integral time (I).
Set a Rapidly Stabilizing Control Condition
To rapidly stabilize the control even if overshoot occurs, reduce integral time (I).
Suppressing Long-cycle Vibration
If vibration occurs with a longer cycle than the integral time (I) set value, lengthen the integral time (I) to sup-
press the vibration.
Input Method Setting Conditions
Analog input A2
Set H3-09 (Analog Input A2 Function Selection) to B (PI feedback).
(Default when PI control is enabled)
Analog input A1
(Differential Mode)
Set H3-09 to 16. Analog input A1 becomes the feedback 1 input and the analog input
A2 becomes the feedback 2 input.
Response
Before adjustment
After adjustment
Time
Response
Before adjustment
After adjustment
Time
Response
Before adjustment
After adjustment
Time
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