Super Systems X5 - Manual (Page 50)

it modifies the PID term para-
meters.
It is the ideal for all applications
where it is required to continu-
ously change the PID terms
parameters in order to adjust the
PID to the changes of the
process dynamic conditions.
In case of power OFF with the
Adaptive Tune enabled, the val-
ues of the PID terms parame-
ters are stored, in order to be
reused at the next power ON.
At power on the Adaptive Tune
starts automatically.
50
4 - Operation
4.5.5 INPUT MENU process conditions.
The self-learning adaptive auto-
tune is not intrusive. It does not
affect the process during the
phase of calculation.
Continuous adaptive tune is
particularly suitable for con-
trolling process whose control
characteristics change with
time or are not linear in rela-
tion to the Setpoint values.
It does not require any operation
by the user. It continuously sam-
ples the process response to the
various perturbations, determin-
ing the frequency and the ampli-
tude of the signals. On the basis
of this data and their statistical
values stored in the instrument,
Perturbation
New
parameters
Continuous adaptive tune
Input
filter
Time constant, in seconds, of
the RC input filter on the PV
input. When this parameter is
Off the filter is bypassed.
Measure
Bias
This value is added to the mea-
sured PV input value. Its effect
is to shift the whole PV scale of
its value (±60 digits).
Sampling
Time
Sampling time, in seconds, of
the instrument. This parameter
is normally used when control-
ling slow process, increasing the
sampling time from 0.1... 10 s.
#t.SaM
#In.sh
Filter response
100%
0
PV 63.2%
Filter time
Time
#t.fil
Fuzzy-Tuning is selected when,
at the start of the autotune
operation, the PV is far from
the Setpoint (more than 5% of
the span). This method has the
advantage of fast calculation
with a reasonable accuracy in
the term calculated.
Natural frequency is selected
when the PV is close to the SP.
This method has the advantage
of better accuracy in the terms
calculated with reasonable speed.
The Fuzzy Tuning automati-
cally determines the best
method to use to calculate
the PID term, according the
Natural frequency
PV variable
Control output
tuning start
End of the tuning
operating and
setting of the new
calculated terms
X5-SSI-uk 18-03-2009 17:54 Pagina 50