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Configured controller type Configured parameter
Three-state controller
Three-step controller
Continuous controller
The configured control structure is not changed by the optimization if it is a PI or PID control structure. In all other cases,
it is optimized to PID control structure.
For 1st order control processes, the parameters required for the PI control structure are optimized, inde pendently of the
„Control structure" configured parameter.
Requirements for autotuning
The following aspects must be considered before starting autotuning:
•
Is the suitable controller type configured?
•
Check and/or adjust the control action of the controller.
•
Is it possible to sufficiently influence the process value in manual mode?
•
For a three-step controller, the actuator time (tt) must be determined and adjusted in the parameter ization.
Starting autotuning
Autotuning is started by long-pressing the „Up" and „Down" buttons at the same time for at least 5 s. The ongoing
autotuning is also stopped (aborted) in the same way.
With the corresponding configuration, autotuning can also be started or stopped by pressing the „Back" button or
through a digital signal. To do so, the controller must not be in manual mode and autotuning must not be inhibited.
A corresponding reference text appears on the display while autotuning is running. Autotuning is com pleted
when the display automatically changes to the basic status. The duration of autotuning depends on the
process.
NOTE!
Autotuning must be performed under real operating conditions; it can be performed any number of times.
NOTE!
If the actual value leaves the measuring range during autotuning, the autotuning process is aborted. In this case, the
configured parameters are not changed.
WARNING
During autotuning according to the oscillation method, output level limits Y1 and Y2 are not ac tive for switched
outputs or solid state outputs.
The output level may exceed or fall below the set limits.
u
It must be ensured that this does not result in damage to the plant.
Product:
Temperature controller XT-T1
Control structure 1 = PI
or
control structure 2 = PI
All other settings
Control structure 1 = PI
All other settings
Control structure 1 = PI
All other settings
Revision 2.0 – Issue September 2018
Optimized parameters
Xp1, Xp2, Tn1, Tn2, Cy1, Cy2, dF;
(Tv1/2 = 0)
Xp1, Xp2, Tv1, Tv2, Tn1, Tn2,
Cy1, Cy2, dF
Xp1, Tn1, dF
Xp1, Tv1, Tn1, dF
Xp1, Tn1, dF
Xp1, Tv1, Tn1, dF
Optimized con trol
structure
PI
E
PID
PI
PID
PI
PID
125/166
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