Pixsys ATR224 Manuel Utilisateur page 14

7.2 Automatic Tune
Automatic tuning procedure allows a precise regulation without delving into the PID regulation
algorithm. Selecting Auto on par. 73
oscillations and optimizes the PID parameters.
Led TUN flashes.
If the PID parameters are not yet selected, at the device switch-on, it is automatically launched the
manual Tuning procedure described into the next paragraph.
7.3 Manual Tune
Manual procedure allows the user greater flexibility to decide when to update
PID algorithm parameters. During the manual tuning, the device generates a step to analyze the
system inertia to be regulated and, according to the collected data, modifies PID parameters.
After selecting
Manu.
• Running Tuning by keyboard:
Press FNC until display 2 shows tunE with display 1 on dis. and then press SET: display 1 shows Enab.
Led TUN switches ON and the procedure starts.
• Running Tuning by digital input:
Select t on par. 231
unE
led switches on and at second activation switches off.
To avoid an overshoot, the treshold where the controller calculates new PID parameters is determined
by this operation:
Tune threshold = Setpoint - "Set Deviation Tune" (par. 74
Ex.: if the sepoint is 100.0∞C and the Par.32
is (100.0 - 20.0) = 80.0∞C.
For a greater precision on PID parameters calculation it is suggested to start the manual tuning
procedure when the process deviates from the setpoint.
7.4 Tuning once
Set on parameter 73
once
Autotuning procedure is executed only once at next device restart. If the procedure doesn't work, will
be executed at next restart.
7.5 Digital input functions
The ATR224 and DRR224 functions related to digital inputs, can be enabled by parameter 231
• : Two threshold setpoint modification: with digital input active the device regulates on SET2,
2t.Sw.
otherwise reulates on SET1;
• : The regulation is enabled only with digital input active,
run.
• : Enables/disables the Tuning if par. 73
tune
• : If par. 48
au.ma. i .
device switches the related regulation loop, from automatic to manual and vice versa.
• : If par. 48
au.ma.c.
regulation loop, with digital input active, otherwise the regulation is automatic.
• : the device execute a cooling type regulation with digital input active, otherwise the
Act.ty.
regulation is of heating type;
• : Allows the reset of the output if manual reset is active for the alarms and for the command
M.reS.
outputs.
14 - ATR224 - DRR224 - User manual
tun. 1
on par. 73 , the procedure can be activated as follows:
tun. 1
. At first activation of digital input (commutation on front panel) led
d. i . 1 .F.
.
tun. 1
is selected as
a.ma. 1 .
is selected as
a.ma. 1 .
(for the regulation loop 1), the controller analyzes the proces
s.d.t. 1
is 20.0∞C the threshold to calculate PID parameters
s.d.t. 1
is selected as
tun. 1
or , with impulse command on digital input, the
enab. en.sto.
or the devices switches to manual the related
enab. en.sto.
)
;
manu.
TUN
.
d. i . 1 .F.