91
Adjustment Level Section 5-4
This parameter sets the PID parameters. Note that PID is automatically set
when AT and ST are executed.
Proportional action: P refers to control in which the MV is proportional to the
deviation (control error).
Integral action: I gives a control action that is proportional to the time
integral of the control error. With proportional control,
there is normally an offset (control error). So, proportional
action is used in combination with integral action. As time
passes, this control error disappears, and the set point
comes to agree with the control temperature (process
value).
Derivative action: D gives a control action that is proportional to the time
derivative of the control error. As proportional control and
integral control correct for errors in the control result, the
control system will be late in responding to sudden
changes in temperature. Derivative action enables con-
trol that is proportional to a predicted process output to
correct for future error
Note Set “none” as the unit for Controllers with Analog Inputs.
■ Related parameters
“AT execute/cancel” (adjustment level)
Proportional band
The control must be 2-PID control.
Integral time
Derivative time
Parameter
Setting Range Unit Default
Proportional band 0.1 to 999.9 EU (See note.) 8.0
Integral time 0 to 3999 Second 233
Derivative time 0 to 3999 Second 40
Function
Setting
See
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