Instruction manual

13
PF 3 / Power Failure
The powerfailedduring firing and temperaturedropped
more than 72°F / 40°C by the time the power came back on.
The kiln will not resume firing. To return to the dis
-
play, press any key.
tC / Thermocouple Failure
The thermocouple failed during the display. See
the "paperclip" test under "FaIL," page 12.
tCL / Thermocouple Lag
The heatingrateis slower than 9°F / 5°C perhour andthe
actual kiln temperature is more than 100°F / 56°C away
from the programmed temperature. The tCL alarm be
-
comes inactive above 500°F. To return to the display,
press any key. Causes:
I
Worn or burned out elements, defective relays, low volt
-
age, and defective thermocouple.
I
On kilns that use a portable controller, the thermocou
-
ple has fallen out of the firing chamber.
I
A bare spot on the thermocouple lead wires has touched
a grounded object inside the kiln switch box causing the
thermocouple to short out.
I
You have programmed a cooling segment temperature
that is below room temperature.
tCr / Thermocouple Reversed
I
This usually means the thermocouple lead wires are re-
versed. Check that the thermocouplelead wires are con-
nectedto the correct terminals. See your kiln’s wiring di-
agram.
I
The thermocouple may be starting to fail and is sending
erratic signals to the controller.
I
The thermocouple inside the kiln is much colder than
the controller circuit board.
Thermocouple
Offset
You can calibrate the controller to fire up to 20°F / 11°C
hotter or cooler than the zero factory setting.
From , press the key. After rate,
temperature, hold, etc., will appear.
With shown in the display, press the
key.
will appear. Press the arrow keys to change
the controller temperature.
Press the key to return to the display.
To fire the controller, press . will ap
-
pear. Or to return to , press two more
times.
Selecting °F or
°C Display
The controller can display temperature in either °F or
°C. If your controller shows a small display dot in the lower
right corner of the display, the temperature shown is °C. No
dot means °F. To change temperature display:
UNPLUG kiln or disconnect power.
Remove the four screws that hold the controller to
the kiln. Carefully remove the controller from the
kiln. Leave wires attached to the controller.
Look at the back of the controller. You will find a set
of connector pins near the bottom labeled “C/F.”
When a jumper is placedon the C/F pins, the display
reads°F. When the jumper is removed,display reads
°C. Remove or insert the jumper as desired. (You
can purchase the jumper from a computer supply
store if necessary.)
Install the controller being careful not to jar compo
-
nents on the back of the controller against the kiln
case.
The C/F jumper terminal is on the back of the controller, circled above.