User manual
- DRR245 17
8.3
Manual Tuning
Manual procedure allows the user greater flexibility to decide when to update
P.I.D. algorithm work parameters. The procedure can be activated in two ways:
•
Running Tuning by keyboard:
Press
|
key until display 1 shows the writing
tunE
with display 2 showing
off
, press
c
, display 2 shows
on
.
TUN
led switches on and the procedure begins.
•
Running Tuning by digital input
:
Select
tune
on parameter 61
dGt.i.
At first activation of digital input
(commutation on front panel)
TUN
led switches on and at second activation
switches off.
8.4
Automatic Tuning
Automatic tuning activates when the controller is switched on or when the
setpoint is modified 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
|
key until display 1
shows the writing
tune
and display 2 shows
on
. Press
d
, display 2 shows
off
.
TUN
led switches off and procedure finishes.
8.5
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.
If parameter 59
op.mo.
is set on
cont.
and parameter 63
ma.ti.
is different from
0, after switch-on and elapsing of the time set on parameter 63, setpoint does
not follow the gradient anymore, but it reaches final setpoint with maximum
power.
Autotuning, manual or automatic, works
ONLY
when the Soft-Start time is
expired and if parameter 59
op.mo.
is set on
cont.
and parameter 63
ma.ti.
is
different from 0.
Summary of Contents for DRR 245
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