8 S
EGMENT
P
ROGRAMMABLE
M
ODEL W
/OTP
31
Tuning
The two sets of PID values can be manually set or
automatically 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
values 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 values
in the control parameters to suit new process conditions.
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.
Note
Start tuning with the process at
ambient temperature. This allows the
tuner to calculate the low cutback and
high cutback values more accurately.
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 parameters.
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 cannot handle the
oscillation caused by a one-shot tune.
To tune your furnace using adaptive tuning:
1.
Load your furnace with a load characteristic of
those you intend to heat in it.
