Pixsys ATR 142 - Auto-Tune; Manual Tuning; Automatic Tuning

16 - ATR142 - User manual
8.2 Auto-Tune
Tuning procedure calculates the controller parameters
and can be manual or automatic according to selection on
parameter 46
tune
.
8.3 Manual tuning
Manual procedure allows the user greater flexibility to decide
when to update PID algorithm parameters. The procedure
can be activated in two ways.
• Running Tuning by keyboard:
Press FNC key until display 1 shows the writing
tune
with
display 2 showing
o FF
, press “
n
”, display 2 shows
on
. The
T
led switches on and the procedure begins.
• Running Tuning by digital input:
Select
tune
on parameter 50
d Gt.i .
. At first activation of
digital input (commutation on front panel)
T
led switches
ON and at second activation switches off.
8.4 Automatic tuning
Automatic tuning activates whenever the controller is switched
on or when the setpoint is modified to a value over 35%.
To avoid an overshoot, the threshold where the controller
calculates new PID parameters is determined by the setpoint
value minus the “Set Deviation Tune” (Parameter 47
s.d.tu.
).
To exit Tuning and keep PID values unchanged, just press the
FNC key until display 1 shows the writing
tune
with the display
showing
on
, press “
m
” , display 2 shows
off
.
The
T
led switches off and the procedure finishes.
8.5 Soft start
To reach the setpoint the controller can follow a gradient
expressed in units (e.g. degree/hour).
Enter this gradient on parameter 51
Grad.
with the chosen
units/hour; only on subsequent activation the controller
uses soft start function.