Pixsys ATR224 Manuel Utilisateur page 15

7.6 Automatic / Manual regulation for % output control
This function allows to switch from automatic functioning to manual command of the output
percentage.
With par. 48 (for regulation loop 1) it is possible to select two modes.
A.ma. 1 .
1 First selection (
enab.
showed
autom.
Press SET to visualize
keys c and d the output percentage. To back to automatic, with the same procedure, select
on display 2: immediately led
2 Second selection (
• If there is a temporary power failure or after switch-off, the manual functioning as well as the
previous output percentage value will be maintained at restarting.
• If the sensor breaks during automatic functioning, the controller switches to manual mode while
maintaining the output percentage command unchanged as generated by the PID immediately
before breakage.
Ex: on an extruder the command in percentage of the resistance (load) is maintained also in case of
input sensor failure.
7.7 LATCH ON Function
For use with input
pot.
value of the scale (par. 4
) to the maximum position of the sensor (par. 10
u.L. i . 1
It is also possible to fix the point in which the controller will display 0 (however keeping the scale range
between and
L.L. i . 1 u.L. i . 1
the virtual zero must be reset at each switching on; selecting
u.0.t.on.
fixed once calibrated. To use the LATCH ON function, configure the par.
Then refer to the following table for the calibration procedure:
Press Display
Exit parameters configuration. Display 2
1 FNC
visualizes writing
Store value on minimum.

2
Display shows
Store value on max.

3
Display shows
Set virtual zero. Display shows
4 FNC If "Virtual zero at start"is selected, point 4
must be repeated at each starting.
1 The tuning procedure starts by exiting the confi guration after changing the parameter.
) allows to enable with
; it's now possible, during the process visualization, modify through the
manu.
MAN switches off and functioning backs to automatic.
) enables the same functioning but with two important variants:
en.sto.
and with linear input (0..10 V, 0..40 mV, 0/4..20 mA) it is possible to associate start
) to the minimum position of the sensor and value of the scale end (par. 5
L.L. i . 1
) using the "virtual zero" option by selectin
Latc.
Low.
HiG.
FNC the writing
configured as
Ltc. 1
Do
Place the sensor on minimum operating
value (corresponding to
Place sensor on maximum operating value
(corresponding to
To exit standard proceeding press SET.
For "virtual zero" setting, place the sensor to
zero point.
ero.
To exit procedure press SET.
on display 1, while on display 2 is
p.---
).
stndr
on par. 10
u.0.sto.
the virtual zero will remain
u.0.sto.
Ltc. 1 1
L.L. i . 1
).
u.L. i . 1
User manual - ATR224 - DRR224 - 15
autom.
. Selecting
Ltc. 1
)