TOHO TTM-i4N - AT Coefficient Setting; AT Sensitivity Setting

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■ AT coefficient setting
Character Name Description Initial Value
1
SET3
CNT
Setting Mode Selection
Screen
Control Parameter Mode
Settings about Control
9
ATG
AT coefficient setting Setting Range: 0.1–10.0
Setting Unit: Times
10
Multiplies the coefficient to the value of proportional band that shall be calculated during AT.
Note:
It is recommended to use the default value for AT coefficient setting parameter.
■ AT sensitivity setting
Character Name Description Initial Value
1
SET3
CNT
Setting Mode Selection
Screen
Control Parameter Mode
Settings about Control
10
ATC
AT sensitivity setting Setting Range: 0–999 or 0.0–999.9
Setting Unit: °C or °F
2
 Sets the sensitivity of the switching of ON/OFF during AT.
Switching of ON/OFF will be performed during AT.
Too much fluctuation in the measurement value during AT may affect the tuning result and may cause a miscalculation of
the PID constant.
In such a case, adjust AT Sensitivity to correct the tuning result.
Also, if AT sensitivity is small, fluctuations in the measurement value caused by the noise may occur or control may greatly
be affected by the external environment if it is operated in the temperature that is close to normal.
In such a case, the product may recognize the effect caused by the external environment as a characteristic of the subject of
control, and therefore, the product may not be able to come up with the optimal control characteristic.
Note: It is recommended to use the default value for AT sensitivity setting parameter.