CGS XT-T1 Betriebsanleitung Seite 123

Parameter
Controller output type 2
Standby output
Step size
Application of switching
period
Start/stop signal
Inhibit signal
Method
The standard method is the oscillation method, whereas the step response method is used specifically in the plastics
industry. With the oscillation method, the output level is set alternately to 100 % and 0 %, which produces oscillation of
the control variable. With the step response method, a step of a specified size is made from the standby output. In both
cases, the controller determines the optimum controller parameters from the response of the actual value.
Optimization according to the oscillation method
In the case of a large control deviation between the setpoint value and actual value (for example, in the startup pha-
se), the controller determines a switching line around which the control variable performs a forced oscillation during
autotuning. The switching line is determined so that the actual value does not exceed the setpoint value if possible.
In the case of minor control deviation (e.g. if the control loop is in a steady state during operation), oscil lation is forced
around the setpoint value. Here, the setpoint value is exceeded in any case.
The controller automatically chooses between two procedures depending on the extent of the control de viation:
Autotuning during the startup phase
x
w
t1
x = actual value
S = switching line
Product:
Temperature controller XT-T1
Selection/text/value
(like output type 1)
-100 to +100 (0)
10 to 100 (30)
Off
On
Digital selector
No selection
Digital selector
No selection
S
t
Revision 2.0 – Issue September 2018
Description
Type of the second controller output (for three-state
controller)
Output level (in percent) at start of autotuning for step
response method
Size of output level step (in percent) for step re sponse
method
Application of Cy cycle time after completion of au-
totuning
The determined value will not be applied.
The determined value will be applied.
Signal (active for rising edge) for starting and stop ping
autotuning
Autotuning is started by a rising edge. If autotuning is
active, it is stopped by a rising edge.
Signal (high-active) for inhibiting autotuning
Autotuning during operation
x
w
t1
w = setpoint value
t1 = start of autotuning
E
t
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