Bentone B 70-3 - 22 Autotuning; 23 Alarms

54
Bentone
21. Autotuning
The autotuning facility can be used to automatically adapt the controller parameters to the
process.
The autotuning function determines the controller parameters for a PID controller or, if dt=0 is
set, for a PI controller in a closed control loop.
- The more sluggishly the process responds to setpoint changes, the
longer the autotuning procedure will take.
- This involves determining the controller parameters rt, dt, Pb1, Pb2,
Cy1, Cy2, dF and accepting them automatically after the end of tuning
22. Alarms
The autotuning facility can be used to automatically adapt the controller
parameters to the process.
The autotuning function determines the controller parameters for a PID controller
or, if dt=0 is set, for a PI controller in a closed control loop.
h Start with
I and D (press simultaneously for >2 sec)
“tUnE” is shown blinking in the green display
h Cancel with
I and D (press simultaneously).
IIIIIIIIIIII
I
I
I
I
I
I
I
I
I
I I I I I I I I I I I I I I
I
I
I
I
I
I
I
I
11 Alarms
Overrange / underrange covers the following events:
- probe break / short-circuit
- measurement is outside the controllable range for the probe connected
-display overflow
Displaying the software version
h Display version with
P and I (press simultaneously).
Display Cause Clear faults
check/rectify/replace
-1999
(blinking!)
Underrange for the value being
displayed.
Is the medium to be
measured within the range
(too hot - too cold?)
Check probe for probe
break / short-circuit.
Check the probe connection
and the terminals.
Check the cable.
9999
(blinking!)
Overrange for the value being
displayed.
All displays are on;
lower 7-
segment
display is blinking
Watchdog or power-on
triggers initialization (reset).
Replace controller if the
in
itialization takes longer
than 5 sec.
PrOF PROFIBUS error Can be suppressed by
setting the PROFIBUS
address to “0.
OPt Hardware configuration error Check which option boards
are installed in the slots.