4.3
Self-tuning
After starting by the operator, the controller makes a self-tuning attempt. The
controller uses the process characteristics for quick line-out to the set-point wit-
hout overshoot.
g
Self-tuning start can be locked via BlueControl (engineering tool) (
P.Loc
).
g
ti
and
td
are taken into account only, if they were
≠
OFF
previously.
4.3.1
Self-tuning start (
Ù
+
È
)
The operator can start self-tuning at any time. For
this, keys
Ù
and
È
must be pressed simultane-
ously. The AdA LED starts blinking.
The controller outputs 0% or
Y.Lo
, waits until the
process is at rest and starts self-tuning (AdA LED
lit permanently).
The self-tuning attempt is started when the following prerequisite is met:
w
The difference between process value
i
set-point must be
≥
10% of the
set-point range (
SP.Hi
-
SP.LO
) (with inverse action: process value smaller
than set-point, with direct action: process value higher than set-point).
After successful self-tuning, the AdA-LED is off and the controller continues
operating with the new control parameters.
4.3.2
Self-tuning cancellation
By the operator:
Self-tuning can always be cancelled by the operator. For this, press
Ù
and
È
key simultaneously. With manual-automatic switch-over configured via
Ò
key,
self-tuning can also be canceled by actuating
Ò
key. The controller continues
operating with the old parameters in automatic mode in the first case and in ma-
nual mode in the second case.
By the controller:
If the Err LED starts blinking whilst self-tuning is running, successful self-tuning
is prevented due to the control conditions. In this case, self-tuning was cancelled
by the controller.
Dependent of control type, the output status is:
w
3-pnt. stepping controller:
actuator is closed (0% output)
w
2-pnt./ 3-pnt./ continuous controller:
If self-tuning was started from the automatic mode, the controller output is
0%. With self-tuning started from manual mode, the controller output is Y2.
Controller
18
Self-tuning
Digital 280-1
FUNC
ADA
OUT1
OUT2
OUT3
ERR
Digital 280-1
Summary of Contents for Digital 280-1
Page 48: ...12 Notes Notes Digital 280 1 48...
Page 49: ...Notes 49 Digital 280 1...
Page 50: ...Digital 280 1 50...
