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5 - Automatic tune
5 AUTOMATIC
TUNE
Start/stop of the Fuzzy Tuning
The Tuning operation can be
started or stopped any time.
The green led 3 goes on when the
Fuzzy Tuning is in progress. At the
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 according 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.
274.8
tune
stop
strt
Operator
mode
press until
To start
select
strt
To stop
select
stop
Step response
SP
Natural frequency
Start of autotune
operation
PV variable
Control output
PV variable
Control output
tuning start
End of the tuning
operating and setting of
the new calculated
terms.
Setpoint change
End of the tuning
operating and setting of
the new calculated
terms.