3.5.1
Selecting the method (
ConF
/
Cntr
/
tunE
)
tunE
=
0
Step attempt during start-up (if X SP - 60 K):
The controller outputs 0% or
Y.Lo
and waits, until the process
is at rest. This is followed by:
2-point controller
: step attempt for heating loop. Then,
the determined parameters are used for
line-out to the set-point.
3-point controller
: as
2-point controller
. Now, the heating
output is frozen and a cooling pulse
(100%) for the cooling loop is output.
After determination of cooling parameters,
control is continued using the heating
and cooling parameters.
tunE
=
1
Pulse attempt during start-up (if X SP - 60 K):
Controller outputs 0% or
Y.Lo
and waits, until the process is
at rest. This is followed by:
2-point controller
: pulse attempt (100%) for heating loop.
followed by line-out to the set-point using
the determined parameters.
3-point controller
: as
2-point controller
. The heating output
is frozen and a cooling pulse (100%) for
the cooling loop is output.
After determination of cooling parameters,
control is continued using the heating
and cooling parameters.
tunE
=
2
Always step attempt during start-up:
see
TunE
=
0
g
With 3-point stepping controller configured, only the step attempt after start-up
is available for self-tuning (
tunE
=
0
).
3.5.2
Self-tuning start
Strt
=
0
Only manual start by pressing keys
Ù
and
È
simultaneously or via interface is possible.
Strt
=
1
Manual start by press keys
Ù
and
È
simultaneously
via interface and automatic start after power-on and detection
of process oscillations.
g
If the process value is higher than the set-point minus 60 K (X
≥
SP - 60 K) and
self-tuning is started manually, the control to the set-point is using the old
parameters followed by an
optimization at the set-point
.
Operation
Operating manual MIR-491
15
Self-tuning
