Barnstead F62730, Operation Manual

Page: 16 / 80

16
Tuning
This controller incorporates a self-tuning feature which
determines the optimum control parameters for the best
temperature accuracy with your load and setpoint. Use
this feature the first time you use your furnace and each
time you change either your setpoint or the type of load
you are heating. Barnstead|Thermolyne recommends you
use this feature to provide the best temperature accuracy
the controller can attain. To use the tuning feature:
1. Adjust the setpoint to your desired value.
2. Press the PAGE button until display reads,
“Atun.”
3. Press the SCROLL button. Display will read,
“tunE.”
4. Press the UP or DOWN button to select, “on.”
5. Simultaneously press the PAGE and SCROLL
buttons to return to the HOME DISPLAY. The
display will alternately flash between “tunE” and
the HOME DISPLAY while tuning is in progress.
6. The controller will then turn the heating on and
off to induce an oscillation. When the measured
value reaches the required setpoint the first
cycle will end.
7. Tuning will be complete after two oscillation
cycles and then the tuner will turn itself off.
8. Normal control function will resume after the
controller calculates tuning parameters.
S
INGLE
S
ETPOINT
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.
Note
“Stat” and “Sp.rr” in Sp list must be
set to OFF or “tunE” will not initiate.