12
7.2 Auto-tune
The Tuning procedure calculates the controller parameters and can be
manual or automatic according to selection on parameter 57
).
7.3 Manual Tuning
The manual procedure allows the user greater flexibility to decide
when to update PID algorithm work parameters. The procedure can be
activated in two ways.
•
By running Tuning from keyboard:
Press the
key until display 1 shows the writing
with
display 2 showing
, press
, display 2 shows
.
The
TUN
led switches on and the procedure begins.
•
By running Tuning from digital input:
Select
on parameter 61
.
On first activation of digital input (commutation on front panel) the
TUN
led switches on and on second activation switches off.
7.4 Automatic Tuning
Automatic tuning activates when the controller is switched on or when
the setpoint is modified to a value over 35%.
To avoid an overshoot, the treshold where the controller calculates the
new PID parameters is determined by the setpoint value minus the
“Set Deviation Tune” ( see Parameter 58
).
To exit Tuning and leave the PID values unchanged, just press the
key until display 1 shows the writing
with the display
showing
, press
, display 2 shows
.
The
TUN
led switches off and the procedure finishes.
