Pixsys ATR227 Series User Manual

12 - ATR227 - User manual
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 Auto
on parameter 8 P.i.d. , 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 SFt.G. with the chosen units/hour: at next activation
the controller will execute the Soft-Start function.
If parameter 24 S.tiM. 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 Au.ma. it is possible to select two modes.
1 First selection ( en. ) pressing
SET
display 1 shows p.--- , while on display 2 appears
auto.
Press to select man mode; it is now possible to modify the output percentage
using and . To back to automatic mode, using the same procedure, select
auto on display 2: MAN led switches o and functioning backs to auomatic.
2 Second selection ( en.st. ) enables the same functioning, but with two important
variants:
• If there is a temporary power failure or after switch-o, manual functioning as well as the
previous output percentage value will be maintained at restarting.
• If the sensor breaks during automatic functioning, controller moves to manual mode
while maintaining the output percentage command unchanged as generated by the PID
immediately before breakage.
Ex: on an extruder the resistance percentage command (load) is kept also in case of
input sensor failure.
7.7 Digital input functions
On ATR227 digital input can be enabled by parameter 25 dGt.i.
• 2.SPv. : Switch between two setpoint thresholds: with digital input active ATR226
regulates on SET2, otherwise on SET1;
• run. : Regulation is enabled only with digital input active;
• tune : Enables/disables Tuning, if parameter 8 P.i.d. is set on man. ;
• au.ma. : (Automatic/Manual) if par. 19 au.ma. is set on en. or en.st. , ATR227 regulates in

Pixsys ATR227 Series Specifications

General

Brand	Pixsys
Model	ATR227 Series
Category	Controller
Language	English