Omron E5CC User Manual page 216

6 Parameters
l.adj
This parameter is displayed after moving to the Adjustment Level. The four numeric digits to identify the
product code are displayed in the No. 2 display.
When a logic operation is set, a period "." will be displayed on the No. 2. display.
Function
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
• Both 100% AT and 40% AT are supported for AT.
Only 100% autotuning is supported for heating and cooling control or for floating
position-proportional 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.
• This parameter will not be displayed when either 100% or 40% AT execute/cancel is set to
be executed using an event input.
OFF:
AT-2:
Operation
AT-1:
• This parameter is normally off. Press the U Key and select at-2 or at-1 to execute
AT. AT cannot be 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 Parameters
See See
Proportional Band, Integral Time, and Derivative Time (Adjustment Level): Page 6-28
Proportional Band (Cooling), Integral Time (Cooling), and Derivative Time (Cooling)
(Adjustment Level): Page 6-29
PID ON/OFF (Initial Setting Level): Page 6-44
Heating/Cooling Tuning Method (Advanced Function Setting Level): Page 6-85
Close/Floating (Initial Setting Level): Page 6-57
6 - 20
Adjustment Level Display
• This parameter indicates that the Adjustment Level has been entered.
(The Adjustment Level parameter will not be displayed again even if the M Key is
pressed in the Adjustment Level to scroll through the parameters.)
AT Execute/Cancel
Setting rage
AT Cancel
100%AT Execute
40%AT Execute
000
The E5@C must be in operation, and control must
be 2-PID control. Event Input Assignment 1 to
Event Input Assignments 6 parameters must be
other than 100% or 40% AT Execute/Cancel.
Default
OFF
E5@C Digital Temperature Controllers User's Manual (H174)