Barnstead F62730, Operation Manual

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be active. Set a value between the control regions that
show the greatest change to achieve the best point of
transfer.
Tuning
The two sets of PID values can be manually set or auto-
matically tuned. To tune automatically you must tune
above and below the transfer point G.SP. If the process
value is below the transfer point G.SP, the calculated val-
ues will automatically be inserted into the (SEt 1) set and
if the process value is above G.SP, the calculated values
will automatically be inserted into the (SEt 2).
Autotuning
The Autotune feature automatically sets up the PID val-
ues in the control parameters to suit new process condi-
tions.
To tune your furnace using autotuning:
1. Load your furnace with a load similar to your
normal load and close the door.
2. Set the setpoint temperature.
3. Press the PAGE button until the display reads,
“Atun LiSt.”
4. Press the SCROLL button until “tunE OFF” is
displayed.
5. Press the UP or DOWN button to select “on.”
6. Simultaneously press the PAGE and SCROLL
buttons to return to the HOME DISPLAY. The
display will flash “tunE” while tuning is in
progress.
Adaptive Tuning
Adaptive tuning continuously evaluates tuning parame-
ters. Adaptive tuning automatically installs new values if
better accuracy is possible. Adaptive tuning should be
used when the characteristics of a process change due to
load or setpoint changes or, in a process that can not
handle the oscillation caused by a one-shot tune.
8 S
EGMENT
P
ROGRAMMABLE
M
ODEL W
/OTP
Note
Start tuning with the process at ambi-
ent temperature. This allows the tuner
to calculate the low cutback and high
cutback values more accurately.