Tuning Your Furnace - Barnstead F46110CM Operation Manual

O P
PERATION OF ROGRAMMABLE
NOTE
The automatic control has automatic
tuning features which install optimum
tuning parameters to give the best
temperature accuracy. No manual
loading of tuning parameters is
needed. We recommend that you tune
the furnace to your specific application
to obtain the best results. To provide
the best temperature accuracy pos-
sible, use these features when you
install your furnace and whenever you
change your application or
procedure.
NOTE
The self-tune feature is inactive while
running a program. The adaptive tune
feature is active only in the dwell seg-
ments of a program.
22
M
ODELS

Tuning Your Furnace

The SAT Self and Adaptive Tuning feature starts the
controller in the Self Tune mode, then automatically
switches over to the Adaptive Tuning mode. Self Tuning is a
one-time function which permits the user to tune the
instrument control parameters to suit new process condi-
tions.
Adaptive tuning takes over when the self tune is completed
and continuously evaluates the tuned parameters. Adaptive
tuning automatically install new values if better accuracy is
possible.
To Tune Your Furnace:
1. Load your furnace with a load characteristic of those
you intend to heat in it.
2. Depress scroll button until SAT is displayed. Depress
the up and down buttons simultaneously to start self-tuning.
During Tuning, the A-T indicator is illuminated (upper right
hand corner) and the lower display indicates the set point at
which the self-tune sequence will occur. The "SP" indicator
will flash for 1 minute, during which time the set point may
be changed. (If you will be using the controller as a single
Setpoint Controller, set the furnace's setpoint to the tem-
perature you intend to use for your application. If you will be
running a multi-step program, set the furnace's setpoint to
the value of PL1 (Program Level #1).) At the end of one
minute, the "SP" indicator will stop flashing, indicating that
the set point can no longer be changed. The A-T indicator
will start flashing and continue to flash until the self-tune is
completed. After the self-tune is completed, adaptive tune
takes over and the A-T indicator will remain illuminated.
4. To stop tuning function, scroll until SAT is displayed
and simultaneously push up and down buttons.
5. Operate your controller normally as described in
Operating the Controller.