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Advanced Function Setting Level Section 5-8
• Normally use the default values for these parameters.
• The AT Calculated Gain parameter sets the gain for when PID values are
calculated using AT. When emphasizing response, decrease the set
value. When emphasizing stability, increase the set value.
• The AT Hysteresis parameter sets the hysteresis for limit cycle operation
during autotuning when switching ON and OFF.
• The Limit Cycle MV Amplitude parameter sets the MV amplitude for limit
cycle operation during autotuning.
Note When the temperature unit is °F, the default is 1.4.
■ Related Parameters
AT execute/cancel (adjustment level): Page 179
at-g AT Calculated Gain
Control must be set to 2-PID control.
at-h AT Hysteresis
lcma Limit Cycle MV Amplitude
Parameter name Setting range Unit Default
AT Calculated Gain 0.1 to 10.0 --- 0.8
AT Hysteresis Universal input:
0.1 to 999.9
°C or °F 0.8 (See note.)
Analog input:
0.01 to 9.99
%FS 0.20
Limit Cycle MV
Amplitude
5.0 to 50.0 % 20.0
Function
Setting
See
See
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