E5CNH E5AN-H E5EN-H Digital Controllers User's Manual - OMRON

Adjustment Level Section 5-4
l.adj Adjustment Level Display
Function
at AT Execute/Cancel
Function
Operation
See
192
This parameter is displayed after moving to the adjustment level.
When a logic operation is set, a period "." will be displayed on the No. 2. 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.)
The ramp must be in operation, and
2-PID control must be used. Event
Input Assignments 1 to 4 parameters
must be other than 100% or 40% AT
Execute/Cancel.
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.
Both 100% AT and 40% AT are supported for AT.
Only 100% AT can be executed for heating/cooling control and positionproportional
floating control.
This parameter will not be displayed when either 100% or 40% AT execute/cancel
is set to be executed using an event input.
Setting rage Default
OFF: AT Cancel
OFF
AT-2: 100%AT Execute
AT-1: 40%AT Execute
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.
When AT execution ends, the parameter setting automatically returns to
off.
■ Related Parameters
PID * proportional band, PID * Integral time, PID * Derivative time (PID setting
level): Page 217
PID ON/OFF (initial setting level): Page 228