Omron E5*D series User Manual page 126

4 Basic Operation
100% AT
• Operation will be as shown in the following diagram, regardless of the deviation (DV) at the start
of AT execution. To shorten the AT execution time, select 100% AT.
PV
SP
AT started
The 100% autotuning is executed.
Operating Procedure
1
Press the M Key several times in the Adjustment Level to dis-
play at (AT Execute/Cancel).
2
Press the U or D Key to select at-2 (100% AT execute).
* The
3
When AT ends, the AT Execute/Cancel parameter is set to off.
Precautions for Correct Use
To execute autotuning, you must set the RUN/STOP parameter to RUN (default: RUN) and the
PID ON/OFF parameter to PID (default: PID). If the RUN/STOP parameter is set to STOP or the
PID ON/OFF parameter is set to ON/OFF, the settings for the AT Execute/Cancel parameter will
not be displayed.
Supplemental Information on AT Operation
• Perform AT with the control set point set and the power supply to the output side (e.g., heater)
turned ON.
• You can start AT from any current temperature.
Additional Information
• PID Constants
When control characteristics are already known, PID constants can be set directly to
adjust control. The PID constants are set in the following parameters in the Adjustment
Level: Proportional Band (P), Integral Time (I), Derivative Time (D), Proportional Band
(Cooling) (C-P), Integral Time (Cooling) (C-I), and Derivative Time (Cooling) (C-D).
• Integral/Derivative Time Unit
If the results of executing AT give a derivative time (D) of less than 10 seconds, we
recommend that you set the Integral/Derivative Time Unit parameter (Advanced Setting
Level) to 0.1 seconds and perform AT again.
4 - 26
Limit Cycle MV
Amplitude 100%
Time
AT ended
* The Limit Cycle MV Amplitude parameter is disabled.
indicator will light during autotuning.
Adjustment Level
at
off
at
at-2
Adjustment Level
at
off
E5@D Digital Temperature Controllers User's Manual (H224)
AT Execute/
Cancel
AT Execute/
Cancel