User manual

18 - URDR0001 - User manual
7. 2 Auto-Tuning
Tuning procedure calculates the controller parameters and can be manual or
automatic according to selection on parameter 57 (
tunE ).
7. 3 Manual Tuning
Manual procedure allows the user greater exibility to decide when to update
P.I.D. algorithm work parameters. The procedure can be activated in two ways:
• RunningTuningbykeyboard:
Press
SET
key until display 1 shows the writing tunE with display 2 showing
off , press , display 2 shows on .
TUN led switches on and the procedure begins.
•RunningTuningbydigitalinput:
Select
tune on parameter 61 d G t .i . At rst activation of digital input
(commutation on front panel) TUN led switches on and at second activation
switches o.
7.4 Automatic Tuning
Automatic tuning activates when the controller is switched on or when the
setpoint is modied to a value over 35%.
To avoid an overshoot, the treshold where the controller calculates new P.I.D.
parameters is determined by the setpoint value minus the “Set Deviation Tune”
(see parameter 58
S.D. tu . ).
To exit Tuning and keep P.I.D. values unchanged, press
SET
key until display 1
shows the writing
tune and display 2 shows on . Press , display 2 shows
off . TUN led switches o and procedure nishes.
7. 5 Soft-Start
To reach the setpoint the controller can follow a gradient expressed in units
(example: Degree/Hours).
Enter the gradient on parameter 62
GrAd . with chosen Units/Hours; only on
subsequent activation the controller uses Soft-Start function.