Automatic Tune; Step Response; Natural Frequency - ascon M1 line Manual

5 - Automatic tune

5 AUTOMATIC
Start/stop of the Fuzzy Tuning
The Tuning operation can be
started or stopped any time.
274. 8
Operator
mode
press until
tune
stop
To start
select
strt
strt
To stop
select
stop
28
The green led 3 goes on when the
Fuzzy Tuning is in progress. At the
TUNE
end of this operation, the calculat-
ed PID terms parameter are stored
and used by the control algorithm
and the controller goes back to the
operator mode. The green led 3
becomes off.
This function allows the calculation
of the optimal PID terms parame-
ters, monitoring the response of the
process to disturbances.
The controller provides 2 types of
"one shot" tuning algorithm, that
are selected automatically accord-
ing to the process condition when
the operation is started.

Step response

This type is selected when, at the
start of the autotune operation, the
PV is far from the Setpoint of more
than 5% of the span.
This method has the big advantage
of fast calculation, with a reasonable
accuracy in the term calculation.

Natural frequency

This type is selected when the PV is
close to the SP setpoint.
This method has the advantage of
a better accuracy in the term cal-
culation with a reasonable speed
calculation.
The Fuzzy Tuning determines
automatically the best method to
use to calculate the PID term,
according the process conditions.
Step response
SP
Setpoint change
operating and setting of
the new calculated
PV variable
Control output
Natural frequency
tuning start
PV variable
operating and setting of
the new calculated
Control output
End of the tuning
terms.
Start of autotune
operation
End of the tuning
terms.