SX25 Series Process Controller - Spirax Sarco

Two tuning methods are provided:
• Initial one shot Fuzzy-tuning
• Continuous, self learning
Adaptive Tuning
Fuzzy-Tuning allows the calculation of
the optimal PID parameters by
monitoring the response of the
process.
The controller provides 2 types of
tuning algorithms, that are selected
automatically according to the
process condition when the
operation is started.
Step response
This type is selected when the
process is started.
There must be a difference between
the set point and the PV of more then
5% of the input scan.
This method has the big advantage
of fast calculation, with a reasonable
accuracy in the PID calculation.
Natural frequency
This is selected when the Process
Variable (PV) is close to the Setpoint
(SP).
46
7 Automatic tuning
This method provides a more
accurate PID calculation but will
take more time to complete.
If the natural frequency tune is
taking too long to complete, try
the step response time.
Operator
mode
press until
To start
select
strt
To stop
select
stop
The green led will flash when
the Fuzzy Tuning is in operation.
At the end of this operation, the
calculated PID values are stored
and used by the control algorithm
and the controller automatically
returns to the operator mode. The
green led will switch off.
IM-P323-25 CH Issue 3