Omron E5CN-HT User Manual page 230

Adjustment Level
l.adj
Adjustment Level Display
Function
at
AT Execute/Cancel
Function
Operation
208
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. dis-
play.
• 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 parame-
ters.)
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 con-
stants 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 position-
proportional floating control.
• This parameter will not be displayed when either 100% or 40% AT exe-
cute/cancel is set to be executed using an event input.
Setting rage
OFF: AT Cancel
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. Auto-tuning is not executed during resets or during ON/
OFF control.
• When AT execution ends, the parameter setting automatically returns to
off.
Conditions for Displaying AT Exe-
cute/Cancel Parameter
Operation must be in Auto Mode and
the PID ON/OFF parameter must be
set to PID.
The Reset Operation parameter
must be set to Fixed SP Operation,
or the Reset Operation parameter
must be set to Stopping Control and
operation must not be on standby or
being reset.
The Event Input Assignment 1 to 4
parameters must not be set to 100%
AT Execute/Cancel or 40% AT Exe-
cute/Cancel.
Default
OFF
Section 5-5