High Temperature Deviation; Power Failure; Thermocouple Failure; Thermocouple Lag - Orton Sentry Xpress 4.0 User Manual

HtdE / High Temperature
Deviation
Causes:
During a heating-up ramp or a hold, the temperature is
100°F / 56°C above the programmed temperature.
During a cooling-down segment, the temperature is
100°F / 56°C higher than the segment's starting temper-
ature.
A fast rate caused the controller to overshoot the target
temperature.
Also, check for a stuck relay.
PF 1 / Power Failure
The power failed during a cooling segment, and the kiln
cooled past the target temperature while the power was off.
The kiln will not resume firing. To return to the
play, press any key.
PF 2 / Power Failure
The power failed during firing and kiln temperature was
below 212°F / 100°C when the power came back on. The
kiln will not resume firing. To return to the
press any key.
PF 3 / Power Failure
The power failed during firing and temperature dropped
more than 72°F / 40°C by the time the power came back on.
The kiln will not resume firing. To return to the
play, press any key.
tC / Thermocouple Failure
The thermocouple failed during the
the "paperclip" test under "FAIL," page 11.
tCL / Thermocouple Lag
The heating rate is slower than 9°F / 5°C per hour and the
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
press any key. Causes:
Worn or burned out elements, defective relays, low volt-
age, and defective thermocouple.
On kilns that use a portable controller, the thermocou-
ple has fallen out of the firing chamber.
A bare spot on the thermocouple lead wires has touched
a grounded object inside the kiln switch box causing the
thermocouple to short out.
You have programmed a cooling segment temperature
that is below room temperature.
12 Single-Speed/Ramp-Hold
tCr / Thermocouple Reversed
This usually means the thermocouple lead wires are re-
versed. Check that the thermocouple lead wires are con-
nected to the correct terminals. See your kiln's wiring di-
agram.
The thermocouple may be starting to fail and is sending
erratic signals to the controller.
The thermocouple inside the kiln is much colder than
the controller circuit board.
Thermocouple
Offset
dis-
You can adjust the controller to fire up to 20°F / 11°C
hotter or cooler than the zero factory setting.
From
temperature, hold, etc.,
With
display,
the controller temperature.
Press the
To fire the controller, press
pear. Or to return to
dis-
times.
Selecting °F or
display. See
°C Display
The controller can display temperature in either °F or
°C. If your controller shows a small display dot in the lower
display,
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 front of the
kiln. Carefully re-
move the control-
ler from the kiln.
Leave the wires
attached to the
controller.
, press the
shown in the display, press the
key.
will appear. Press the arrow keys to change
key to return to the
, press
key. After rate,
will appear.
display.
. will ap-
two more