
GOSSEN METRAWATT GMBH
27
Self-Tuning
Sequence
–
The setpoint which is active when tuning is started remains valid and can no longer be changed (slave
controllers: changing external setpoints are only displayed).
–
Activation or deactivation of setpoint 2 does not become effective.
–
Selected setpoint ramps are not taken into consideration.
–
If started at the operating point (actual value approximates the setpoint value), overshooting cannot be
avoided.
Abort
–
Self-tuning can be aborted at any time with the
keys (
→
automatic operating mode), or by
switching to manual / off with the
key.
–
If an error occurs during self-tuning, the controller no longer reads out an actuating signal. Self-tuning
must be aborted in this case.
Additional information regarding error messages upon request.
Self-tuning is used to achieve optimized controller dynamics, i.e. parameters
Pb 1
,
Pb11
,
tu
and
tc
are determined.
Read-out cycle time
tc
is not changed during self-tuning.
We recommend for
tc
a value of
tu
/12
to guarantee satisfactory controller
dynamics. When controlling contactors,
tc
should be adequately increased.
Preparation
–
Complete configuration must be performed before self-tuning is started.
–
The setpoint value is adjusted to the value which is required after
self-tuning.
Start
–
Briefly press the
keys simultaneously at the operating level (auto-
matic or manual / off operating mode) in order to trigger self-tuning. Self-
tuning cannot be started in the “actuator” or “limit transducer” mode.
–
tun1
...
tun8
blinks at the display at all operating levels during self-tuning.
–
The controller is switched to the automatic operating mode after self-tuning has been successfully com-
pleted.
–
In the case of 3-step controllers (controller sorts 4 and 5), cooling is activated if the upper limit value is
exceeded in order to prevent overheating. Self-tuning then performs an oscillation test around the set-
point.
Start
Abort
Slow Blinking
or
I
II
A1
A2
W2
Current
I
II
A1
A2
W2
Current
Current