7 Configuration
62
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.
It must be ensured that this does not result in damage to the plant.
7.9.4 Control loop monitoring (setup only)
Control loop monitoring monitors the control response during startup of a plant and in the event of a set-
point step by analyzing the change of the actual value during an output level change. An alarm is issued
if the actual value does not respond according to the specifications.
Parameter Selection/text/value Description
Function Off Control loop monitoring is not active.
On Control loop monitoring is active.
Response time 0 to 9999 Time period (in seconds) in which the actual value
must leave the monitoring band.
"0" setting means:
Response time = reset time Tn
Monitoring band 0 to 9999 Range that the actual value must leave within the
response time.
"0" setting means:
Monitoring band = 0.5 × proportional band (Xp)
To Next Page
Loading...
Need help?
General
