16
Operation of Automatic Models
(Models F46110CM, F46110CM-33, F46118CM,
F46230CM, F46230CM-33, F46238CM)
Control Parameters
PR = program ramp rate, the rate of heat increase or
decrease in °C/minute. Pushing the up or down button will
give the current setting of this ramp. Push up or down
button to set.
SP2. SP2 is not configured into control and nonfunctional.
Set to 20.
ST = Self-tune automatically loads PID values on initial
start up. This function does not have a value, it is
either “ON” or “OFF”. (See Furnace Operation for
function of Self-tune).
AT = Adaptive Tune, which analyzes and inputs optimum
PID values when temperature has reached set point. This
function does not have a value, it is either “ON” or
“OFF”. (See Furnace Operation for function of Adaptive
Tune).
SAT = Self-Adaptive Tune when engaged starts controller in
self-tune mode then automatically switches to Adaptive
Tune (AT). This function does not have a value, it is either
“ON” or “OFF”. (See Furnace Operation for function of
Adaptive Tune).
ATR = Adaptive Tune Range setting determines the
operational band width of the adaptive tuning function.
Self-tuning automatically determines this setting.
AL1 = Alarm 1 is a full scale alarm which protects load
and furnace when temperature exceeds preset value.
Furnace will control temperature at the preset
temperature value, it will not shut off furnace.
The next five parameters: proportional (PB), integral (+i),
derivative (+d), cutback low (cbl) and cut back high (cbh)
are for high accuracy control. These parameters are set
during Self-Adaptive Tune. (See Tuning Your Furnace.)
NOTE
Thermolyne recommends that you set
the value of AL 1 either at 1710°C
(3092°F) or at a value of 20 degrees
above your working temperature if you
desire to provide protection for your
workload.
NOTE
“OR” will be displayed if an open thermo-
couple condition exists.
NOTE
To change from °C indication to °F
indication, contact Barnstead/
Thermolyne.
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 possible, use these features
when you install yourfurnace and
whenever you change your application
orprocedure.
Operation of Automatic
Controls
