Omron E5AC-T User Manual page 288

at
This parameter executes auto-tuning (AT).
• The MV is forcibly increased and decreased around the set point to find the
characteristics of the control object. From the results, the PID constants are automatically
set in the Proportional Band (P), Integral Time (I), and Derivative Time (D) parameters.
Function
• AT can be set to 100% AT, 40% AT, All PID 100% AT, or All PID 40% AT.
You can specify only 100% AT or All PID 100% AT during heating and cooling control or
during position-proportional floating control.
• For heating/cooling control, select the tuning methods that is suitable for the cooling
control characteristics in the Heating/Cooling Tuning Method parameter.
• If autotuning is performed with the default settings, the cooling PID constants (i.e.,
Proportional Band (Cooling), Integral Time (Cooling), and Derivative Time (Cooling)
parameters) have the same values as the heating PID constants.
ATA1:
Operation
ATA2:
OFF:
AT-2:
AT-1:
• This parameter is normally off. at-2, at-1, ata1, or ata2 to execute AT.
Auto-tuning is not executed when control is stopped or during ON/OFF control.
• The TUNE indicator will light during autotuning.
• When AT execution ends, the parameter setting automatically returns to off.
Related Sections
See
See
4-9 Determining PID Constants (Autotuning and Manual Setting) (page 4-49)
5-14 Determining PID Constants for PID Sets (Autotuning for All PID Sets) (page 5-45)
Related Parameters
Proportional Band, Integral Time, and Derivative Time (Adjustment Level): Page 6-36
Proportional Band (Cooling), Integral Time (Cooling), and Derivative Time (Cooling)
(Adjustment Level): Page 6-37
PID*Proportional band, PID*Integral time, PID*Derivative time (PID setting level): Page
6-46
PID ON/OFF (Initial Setting Level): Page 6-63
Heating/Cooling Tuning Method (Advanced Function Setting Level): Page 6-103
Close/Floating (Initial Setting Level): Page 6-75
E5@C-T Digital Temperature Controllers User's Manual (H185)
AT Execute/Cancel
Setting rage
All PID 40% AT Execute
All PID 100% AT Execute
AT Cancel
100%AT Execute
40%AT Execute
Control must be set to 2-PID control and the Reset
Operation parameter must be set to fixed SP
operation, or the Reset Operation parameter must
be set to stop operation and the Controller must
not be on standby or performing a reset.
Default
OFF
6 Parameters
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