Pixsys ATR 401, Руководство пользователя, Страница: 20 / 124

20 ATR401 - User manual
8.2
Auto-Tuning
Tuning procedure to calculate regulation parameters can be manual or
automatic and according to selection on parameter 28

.
8.3
Manual Tuning
Manual procedure allows the user more fl exibility on deciding when to update
regulation parameters of P.I.D. algorithm.
Press key
FNC
until display 1 visualizes writing

and display 2 visualizes

.
Pressing , display 2 visualizes

. Led TUN switches on and procedure starts.
8.4
Automatic Tuning
Automatic tuning starts when the controller is switched-on or when setpoint
value has been modifi ed over 35%.
To avoid overshooting, the threshold where controller calculates new P.I.D.
parameters is determinated by setpoint value minus “Set Deviation Tune”
value (see parameter 29

). To interrupt Tuning keeping the P.I.D. values
unchanged, press key
FNC
until display 1 visualizes writing

and display
2 visualizes

. Pressing , display 2 visualizes

, led TUN switch off and
procedure ends. Setting

on parameter 28

autotuning procedure
starts only once when instrument is switched on: after calculating P.I.D.
parameters parameter 28

returns to

8.5
Automatic / Manual Regulation for % Output
Control
This function allows to switch from automatic functioning to manual control of
output porcentage. With parameter 83

, it is possible to select two modes.
1 First selection (

). Pressing key
FNC
display 1 visualizes writing

on
display 1, while display 2 visualizes

. Press key to select manual
mode

. Whit and change output percentage. To return to
automatic mode with the same procedure select

on display 2: led
MAN switches on and operation returns to automatic mode.
2 Second selection (

). Enable the same functioning, but with two
important variants:
• In case of power failure or after a switch-off , at restart both the manual
functioning and the previously fi xed output percentage value will be
maintained.
• If during automatic functioning there is a sensor failure, controller will
automatically switch to manual mode while maintaining command output
percentage unchanged as generated by P.I.D. immediately before failure.