Htde / High Temperature Deviation; Pf 2 / Power Failure; Pf 3 / Power Failure; The "Lid" Display - Orton Sentry 2.0 Operating Instructions Manual

HTdE / High Temperature
Deviation
During a heating-up ramp or a hold, the temperature is
above the deviation setting. (See Temperature Devia-
tion, page 15.)
This may be caused by a temperature overshoot. See
page 9.
Check for a stuck relay.

PF 2 / Power Failure

The power failed. The kiln temperature was below
212°F/100°C when the power came back on.
The kiln will not resume firing.

PF 3 / Power Failure

This message appears when two conditions are met:
The power failed during the final segment of a fir-
ing and that segment's rate was 108°F/60°C.
The temperature dropped 72°F/40°C while the
power was off.
The kiln will not resume firing.

The "LId" Display

Reasons appears in the display:
The kiln is equipped with the optional lid safety switch.
(The switch turns off power to the elements when the lid
or door is open.)
lid is open during firing.
On the back of the Sentry circuit board, at the top right
side, is a small two-pin
terminal. If the connec-
tor on that terminal is
missing, will ap-
pear in the display during
firing. The elements will
not turn on. (If the
two-pin connector is
missing, you can buy an-
other from a computer
supply store.)
The safety lid switch is
defective or the safety
switch wire is broken.
18
appears in the display while the
If the display
shows error
codes as the kiln
fires, the solu-
tion is often to
program slower
heating and cool-
ing rates.

PLOG Error Codes

A PLOG error code means the controller failed a self-di-
agnostic test. A chattering, noisy relay, low voltage, and the
wrong relay type can cause a PLOG error. The controller
will not operate while a PLOG message appears.
PLOG 11, 12 or 13 Error Codes
PLOG 11, 12, and 13 indicate that a thermocouple is
about to fail or that electrical noise is affecting the thermo-
couple.
Try moving the thermocouple lead wires away from
nearby electrical wires and relays.
Make sure the bare part of the leads extending from the
thermocouple are not touching the kiln case.
Replacing the thermocouple often clears the PLOG 11,
12 or 13 code.
If your kiln has mercury relays, verify that noise snub-
bers (MOVs) are installed.
Clearing PLOG Error Codes
Clear the PLOG error code by pressing
If pressing
turn off power to the kiln for 10 seconds.
If the PLOG error code still appears, turn off the
power. Hold down the
same time while you turn the power back on. This
resets the controller (see Reset option, page 16),
so you may need to reselect thermocouple type
(see TC option, page 14) and type of temperature
display (see CHG option, page 14).
After a PLOG error clears, it is okay to fire the kiln again
with close supervision. If you can't clear the PLOG error,
return the controller to the factory.
TCdE / Uneven Multiple-Zone
Temperatures
On a multiple zone kiln,
thermocouples and elements are improperly wired. A ther-
mocouple is turning on the elements to the wrong zone. For
instance, if the top thermocouple turns on the bottom ele-
ments, the kiln will fire out of balance. When zones are out
of balance by 180°F/100°C,
play.
Visually compare the wiring of the thermocouples, re-
lays and elements in your kiln to the kiln's wiring diagram.
Also, use the Element Test option shown on page 16.
TCR / Thermocouple Leads
Reversed
Check that the thermocouple lead wires are connected
to the correct terminals. See your wiring diagram.
does not clear a PLOG error,
and keys at the
usually means the
will appear in the dis-
.