19
how far the furnace chamber temperature
can rise
above your set point. We recommend a setting of 20;
since a P.I.D. control process
involves some degree of
temperature overshoot, a setting of less than 20 may in-
terfere with the function of your controller.
LooP - Thermocouple break alarm detection time. For
proper operation of your furnace, this
parameter
should be set to “0.00”. If it is not, set it to “0.00”.
CTrL - Control type. Push the “Up” or “Down” buttons to
set to “Pid” or “FUZY”. Programmed
operation re-
quires P.I.D. control. Single set point operation will
achieve better control using Fuzzy
logic control.
Programming Controller
This controller allows you a maximum of 4 ramp and 4
dwell segment combinations, thus enabling 4 different set
point levels to be achieved. Each ramp is programmed
by specifying the ending temperature level and the re-
quired time to ramp to that temperature. The controller
then automatically calculates the ramp rate required to
attain the ending temperature level based on the desired
ramp time. Dwell segments then can be attached to each
temperature level to hold that temperature for a specified
amount of time.
To run a program, first determine your ramp times, end-
ing temperature levels and dwell times. It is helpful to
graph your program out for ease of loading the program
into the controller.
Make sure “ProG” (program options) is set to “oFF” (to
stop the program) when entering program values.
Push “SEL” button until “Sü-1” is displayed. Push the En-
ter button (>) to select the current value. Push “UP” or
“DOWN” button and set Set point 1 in °C. Push the Enter
button to enter the set
value as the current value.
Push “SEL” button until “TN1r” is displayed. Push the En-
O
PERATION
OF
4 R
AMP
& 4 D
WELL
P
ROGRAMMABLE
M
ODELS
CAUTION
Remember that whenever the power switch is
turned “ON,” the furnace will begin to heat at the
set point temperature that was previously set. This
value will remain unchanged for up to a year with-
out power being applied to the control.
