Operating instructions

middle section, and the bottom light power to the bot
-
tomsection. (Two-zone kilns: Ignore the center light.)
Note: Though power outputlights are on, mechanical
problems can prevent the relays from turning on.
I
When a zone temperature is too low, its indicator light
will flash rapidly. The heating elements in that zone will
stay on continuously, and the controller will attempt to
balance the heat in the other two zones.
Testing Multiple-Zone
Elements
When relays or thermocouples are connected to the
wrong controller terminals, zones will show a wide temper
-
ature difference. To wire the kiln properly, trace the switch
box wiring with the kiln’s wiring diagram. Also, see “Ele
-
ment Test,” page 18.
Multiple-Zone Options
These options appear only on multiple-zone kilns. They
are accessed by pressing the Options key.
DIFF / Zone Temperature
Difference
View Maximum Temperature Spread
For a two-zone kiln, this option shows temperature dif-
ference between the zones. For a three-zone kiln, it shows
the highest temperature differencebetween any two zones.
If the temperature shown is larger than expected, go to op-
tion T123 to view the temperature of each zone.
Press repeatedly until appears.
Press
.
The maximum difference in temperature between
any zones will display. (Example: = 3°)
T123 / Zone Temperature
Display
View Temperature of Each Zone
Press repeat
-
edly until appears.
Press
.
The temperature for each
zone will display one af
-
ter the other, cycling for one minute. Then normal
temperature display will return. For example:
I
Top zone:
I
Middle zone:
I
Bottom zone:
Chapter 6
The Options
Key
The Options key gives you access to a list of special fea
-
tures. With each press of the Options key, you will see the
display code for the next option.
When you find the option you want to use, press
.
Use the and keys to select changes within the
option.
After making a selection for an option, press
. The display code for the option you just
changed will appear. You are then ready to go to
the next option.
Note: If you select a change for an option but don’t
press
, the change will not go into effect.
There are two ways to get out of Options and back to
:
Press .
Do nothing for 60 seconds in Options. You will au-
tomaticallybe taken out of the Optionsdisplay and
back to .
Note: If you are firing the kiln while in Options, press-
ing
takes you out of Options and back to the fir-
ing display. But it does not stop the firing.
TCOS / Thermocouple Offset
Calibrate the Thermocouple(s)
The thermocouple is the rod protruding into the firing
chamber. It measures temperature. Thermocouples can
“drift” as they age, causing a shift in temperature readings.
Thermocouple Offset calibrates the controller to compen
-
sate for drift.
Note: The thermocouple must protrudeinto the firing
chamber the correct distance: 1” for ½” - ¼”-wide
thermocouples,
1
2
" for
5
8
" -
1
8
”-wide thermocouples.
Calibrating Thermocouple Offset
With a Digital Pyrometer
You can calibrate Thermocouple Offset using a cali
-
brated digital pyrometer. Oneway to calibrate yourpyrom
-
eter is to take it to a heat treater or other location that has a
calibrated controller you can trust. Take a reading from a
furnace with your pyrometer. Either zero it out to match
the calibrated controller on the furnace, or write down the
temperature difference between your pyrometer and the
reliable source. Store your pyrometer. Use it only for cali
-
14 Ramp-Hold