17
Note
Furnace must be at ambient
temperature before starting a tune.
Note
Tune has completed when “tunE”
stops flashing on display.
S
INGLE
S
ETPOINT
M
ODELS W
/OTP
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 recom-
mends you use this feature to provide the best temper-
ature accuracy the controller can attain. To use the tun-
ing 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 DIS-
PLAY. 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.
Note
“Stat” and “Sp.rr” in Sp list must be
set to OFF or “tunE” will not initiate.
