Pixsys ATR 243, Руководство пользователя, Страница: 17 / 96

ATR243 - User manual - 17
7.4 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
SET
key until display 1 shows the
writing
tune
and display 2 shows
on
. Press , display 2 shows
off
. TUN led switches off
and procedure finishes.
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.
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 does not work when only the par.
GrAd.
is different from 0. If parameter 63
ma.ti.
is different from 0 and parameter 57
tune
is set on
Auto
the autotuning starts
when Soft-Start time is finished, while if parameter 57
tune
is set on
Man.
the autotuning
can be started only when Soft-Start finishes.
7.6 Automatic / Manual Regulation for % Output Control
This function allows to select automatic functioning or manual command of the output
percentage.
With parameter 60
Au.ma.
the operator can select two methods:
1 First selection (
en.
)
Pressing
SET
key display 1 shows
p.---
, while display 2 shows
Auto
.
Pressing key display shows
Man.
; it is now possible to change the output percentage
using and . To return to automatic mode, using the same procedure, select
Auto
on display 2: led MAN switches off and functioning returns to automatic mode.
2 Second selection (
EN.ST,
)
enables the same functioning, but with two important variants:
• 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 moves to manual
mode while maintaining the output percentage command unchanged as generated
by the P.I.D. immediately before breakage.