Controller Functions; Modification Of Main And Alarm Setpoint Value; Automatic Tune; Manual Tune - Pixsys ATR244-12ABC Manual De Instalación

8

Controller Functions

8.1

Modification of main and alarm setpoint value

Setpoint value can be modified from keyboard as follows:
Press Display

1 Value on display 2 changes.

Visualizes the other setpoints on display 1.
2 SET
Display 2 shows the setpoint type.

3 Value on display 1 changes.

8.2

Automatic Tune

Automatic tuning procedure allows a precise regulation without delving into the PID regulation
algorithm. Selecting Auto on par. 73
regulation loop 2), the controller analyzes the proces 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.
8.3

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
of digital input (commutation on front panel) led
switches off.
• Running Tuning by serial input:
Write 1 on word modbus 1216 (command 1) or 1217 (command 2): led
procedure starts. Write 0 to stop the tuning.
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.
8.4

Tuning once

Set on parameter 73
once
Autotuning procedure is executed only once at next ATR244 restart. If the procedure doesn't work, will
be executed at next restart.
18 - ATR244 - User manual
tun. 1
on par. 73 , or on par. 98
tun. 1
(or on par. 239
d. i . 1 .F.
, or on parameter 98
tun. 1
Do
Increases or decreases the main setpoint
value.
Increases or decreases the alarm setpoint
value.
(for the regulation loop 1), or on par. 98
, the procedure can be activated in three ways:
tun.2
, par. 247
d. i .2.F. d. i .3.F.
TUN led switches on and at second activation
or par. 99
s.d.t. 1
is 20.0∞C the threshold to calculate PID parameters
s.d.t. 1
.
tun.2
, par. 255 ) . At first activation
d. i . 4 .F.
TUN switches ON and the
)
s.d.t.2
(for the
tun.2