5.5 Initial Setting Level (2)
5-15
Parameters
SP mode
Proportional band
The proportional band (P) is set in this parameter. The proportional band for AT (auto-tuning) and
ST (self-tuning) can also be set automatically.
• P operation: Refers to control in which the MV is proportional to the deviation.
Setting range Unit Default
1 to 999 °C/°F 8
* When the proportional band is changed manually, the tuning selection
parameter automatically changes to AT (ST disabled).
ALM mode
Integral time
The integral time (I) is set in this parameter. The integral time for AT (auto-tuning) and ST
(self-tuning) can also be set automatically.
• I operation: Refers to a control action that is proportional to the time integral
of the deviation. With proportional control, there is normally an offset (control
error). Proportional action is thus used in combination with integral action. As
time passes, this control error disappears, and the control temperature
(process value) comes to agree with the set point.
Setting range Unit Default
0 to 1999 Second 233
0 to 99 Minute 4
* When the integral time is changed manually, the tuning selection
parameter automatically changes to AT (ST disabled).
IS mode
Derivative time
The derivative time (D) is set in this parameter. The derivative time for AT (auto-tuning) and ST
(self-tuning) can also be set automatically.
• D operation: Refers to a control action that is proportional to the time
derivative of the control error. The proportional control and integral control
correct for errors in the control result, and thus the control system is late in
responding to sudden changes in temperature. The derivative action
increases the MV in proportion to the slope of the change in the
temperature as a corrective action.
Setting range Unit Default
0 to 1999 Second 40
* When the derivative time is changed manually, the tuning selection
parameter automatically changes to AT (ST disabled).
Function
Setting
Function
Setting
Function
Setting
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