Pixsys ATR226 - Auto-Tuning; Manual Tuning; Automatic Tuning; Soft-Start

User manual - ATR227 - 11
7.2 Auto-Tuning
Tuning procedure to calculate regulation parameters can be manual or automatic accor-
ding to selection on parameter
8 ( 3LG ).
7.3 Manual Tuning
Manual procedure allows the user a greater exibility to decide when to update PID
algorithm parameters
. After selected 0$Q on parameter 8 ( 3LG ), the procedure can be
activated in two ways:
t Running Tuning by keyboard:
Press
SET
until display 1 shows the writing WXQ( with display 2 showing R)) , press ,
display 2 shows RQ .
TUN led
switches on and the procedure starts.
t Running Tuning by digital input:
Select WXQ( on parameter 25 G*WL . At rst activation of digital input (commutation on
front panel)
TUN led switches ON while at second activation switches o.
7.4 Automatic Tuning
Automatic tuning procedure has been conceived to give user the possibility to have
a clear regulation also without knowledge of PID regulation algorithm. Setting
$XWR
on parameter
8
3LG , the controller will check process oscillations and will modify PID
parameters.
7.5 Soft-Start
At starting the controller can follow a gradient expressed in units (ex. Degree/Hour) to
reach the setpoint.
Enter this gradient on parameter 21 6)W* with the chosen units/hour: at next activation
the controller will execute the Soft-Start function.
If parameter 24
6WL0 is dierent from 0, after switch-on and elapsing of the time set
on parameter 24 , setpoint does not follow the gradient anymore, but it reaches nal
setpoint with maximum power.
7.6 Automatic/Manual Regulation for % Output Control
This function allows to select automatic functioning or manual command of the
output percentage.
By parameter 69
$XPD it is possible to select two modes:
1 First selection (
HQ ) pressing
SET
display 1 shows S , while on display 2 appears
DXWR
Press to select PDQ mode; it is now possible to modify the output percentage
using
and . To back to automatic mode, using the same procedure, select
DXWR on display 2: MAN led switches o and functioning backs to auomatic.
2
Second selection ( HQVW ) enables the same functioning, but with two important
variants:
t
If there is a temporary power failure or after switch-o, manual functioning as well as the