AF4X Kiln Controller
9
A Program Review will show the message
FULL
to indicate the uncontrolled rate. Deviation alarms will not be
active during the heating/cooling ramp.
Caution: Overshoot in temperature may occur when a kiln is heating at full power, especially at lower
temperatures.
Target Temperatures
Each program step requires you to program a desired target temperature.
°°°°
F
or
°°°°
C
is the controller display for target temperature. Like rate, each temperature segment will have its own
number. The temperature for the first ramp step will be displayed as
°°°°
F 1
or
°°°°
C 1
, the temperature for the second
ramp step as
°°°°
F 2
or
°°°°
C 2
and so on.
Caution:
Do not program target temperatures that exceed the temperature rating for your kiln. The maximum
programmable value for target temperatures can be viewed in the
SFTY
option.
Cooling Ramps
Cooling ramps are programmed the same as heating ramps. You must program the Rate for the cooling and the
target temperature. The criteria for a cooling ramp is the target temperature must be lower than the preceding target
temperature.
If you program a target temperature at the end of the firing that is below your room temperature, the controller will
never be able to complete the firing. This may result in a
FTL
alarm. To avoid this alarm, manually stop the firing
by pressing the
Program/Stop
key or program a higher temperature to complete the firing
Changing a Target Temperature During a Firing
If the kiln is firing and you need to modify the current ramp target temperature, use
CHGT
option. The controller
will display the current setting and allow you to change it. See the Option menu section of this manual for more
details.
Hold Time
Each program step requires you to program a desired hold time.
Hold time refers to the amount of time you want the kiln to remain at the target temperature. Hold Time is often
referred to as Soak or Dwell Time. Each ramp allows the option of programming a hold time. Hold time is
programmed in Hours and Minutes. The decimal point light in the center of the controller display separates hours
from minutes. The two digits to the left of the decimal point indicate hours while the right side indicates minutes.
Example;
A 1 hour hold time should be programmed as
01.00
or
A 30 minute hold time would be
00.30
During a Hold time, the controller will count-down the remaining time of the Hold on the display.
HD
is the controller display for hold time. Each Hold segment will have its own number. The hold time for the
first ramp step will be displayed as
HD 1
,
the hold time for the second ramp step as
HD 2
and so on.
