Barnstead F62730 Operation Manual - page 32

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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.