Programming instructions

7
A Ramp-Hold
Practice Program
To practice using the controller, we will enter a program
that includes three segments. The last segment is a cooling
segment.
Using the programming instructions in the next column,
enter this firing schedule. Then use Program Review (page
3) to check for accuracy.
PrO1
rA1 = 250
°F1=750
HLd 1 = 00.00
rA2 = 900
°F 2 = 1425
HLd 2 = 00.30
rA3 = 150
°F3=750
HLd 3 = 00.00
rA4 = 0000 (zeroes cancel segments 4-8)
Skipping a Segment in a
Ramp-Hold Program
You can skip a segment in a Ramp-Hold program as fol-
lows:
The kiln is firing. Press the key.
will appear. Press the key again.
The firing will skip to the next segment.
Skip Segment Example
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You have pro
-
grammed a target temperature of 1425°F for glass fus
-
ing, followed by a segment for controlled cooling.
Watching the glass through the peephole, you notice
that the glass edges have rounded nicely at 1375°F. Use
Skip Segment to end the firing segment and begin the
one for slow cooling.
Note: Make a note of the temperature at which the
glass fused. Program that temperature for the next fir
-
ing of that type of glass.
Ramp-Hold Programming
Instructions
Note: You have up to 8 segments available in
Ramp-Hold. If you don’t need all 8, zero out the
unused segments. See step 6 below.
From , press .
Press the key (not the ).
and are
Ramp-Hold programs. When the one you want
appears,press . (Ignore - .)
will appear. Enter firing rate (temperature
change per hour) for segment 1. (1° = slowest
rate. 1799°F/999°C = full power.) Then press
.
or and the target temperature from
the last firing will appear. Use the arrow keys to
change the temperature. Then press .
and the hold time from the last firing will
appear(e.g. 1 hour 10 minutes = 01.10). Use the
arrow keys to change the hold time. Then press
.
Continue entering values for the segments
needed. When appears for the next seg-
ment that you don’t need, select . Then
press . This will zero out the remaining
segments. (Example: You need only 1 segment.
When appears, enter .)
will appear. Press to begin firing.
will appear and the Run indicator light
with begin blinking. The kiln is now firing.
To stop a firing before completion, press
. will appear, alternating with total
firing time and kiln temperature.
Note: Do not be concerned if your kiln makes a
clicking sound during firing. Kilns use relays to
power the elements. The relays click each time
their electrical contacts come together.
Note: The kiln’s actual firing rate may be less than
the rate you programmed, depending on the kiln
model, available voltage, and density of the load
you are firing.
When the kiln fires to completion, it will beep for 30
seconds. The display will show the following:
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Firing time
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Present temperature
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= Fired to completion
To return to , press .