Error Messages; Ftc / Failed To Cool; Fth / Failed To Heat; Ltde / Low Temperature Deviation - Orton Sentry 2.0 Operating Instructions Manual

Chapter 7
Error
Messages
Error messages are accompanied by an alarm.
Non-interrupting messages do not stop the firing. Ter-
minating error messages do.
FTH, FTC, and LTdE error messages are based upon
the adjustable setting in the Temperature Deviation
(TEdE) option (page 17).
On controllers with pre-18D software, the
Note:
HTdE error message is also based on the TEdE option.
Non-Interrupting

Error Messages

Press to silence the alarm. (Do not press
to silence the alarm.) The error message will remain but
the kiln will continue firing. Even though the following er-
ror messages appear, the kiln will continue its normal oper-
ation. The messages are only to alert you that the kiln could
not cool or heat as fast as you had programmed. But they
will not shut off the kiln or affect the firing in any way.
Definition of "Set Point"
The temperature that the controller is trying to reach, at
any given time, is called the set point. During heating or
cooling, the set point changes at the rate you programmed.
During a hold, the set point remains steady.

FTC / Failed to Cool

During a cooling-down ramp, the programmed rate is
faster than the kiln can cool. The temperature is above
the set point temperature by more than the deviation
setting. (See Temperature Deviation, page 17.) Pro-
gram a slower cooling rate.
Note: On controllers with 18D and later software:
Use Present Status to compare the actual rate of the
current segment with the rate you programmed. (See
page 12.)

FTH / Failed to Heat

During a heating-up ramp, the programmed rate is
faster than the kiln can heat. The temperature is below
the set point temperature by more than the deviation
setting. (See Temperature Deviation, page 17.)
Program a slower rate. Or check for worn or burned out
elements, defective relays, low voltage and defective ther-
mocouple.
Note: On controllers with 18D and later software:
Use Present Status to compare the actual rate of the
current segment with the rate you programmed. (See
page 12.)
LTdE / Low Temperature
Deviation
During a cooling-down ramp or a hold, the temperature
is below the set point temperature by more than the de-
viation setting. (See Temperature Deviation, page 17.)
Check for worn or burned out elements, defective re-
lays, low voltage and defective thermocouple.
Note: During a firing, Present Status shows the ac-
tual firing rate of the current segment instead of the
rate you programmed. If you think your kiln is heating
or cooling too slowly, compare the rate shown in Pres-
ent Status with the rate you programmed for that seg-
ment. This is another reason you should always keep a
written record of your firing programs. (Pre-18D soft-
ware versions show the programmed rate in Present
Status rather than the actual rate. See page 18, SOFT
option, to look up the software version.)

PF / Power Failure

alternating with normal display means the power
failed during firing. After power was restored, the firing re-
sumed.
TC with Lines / Multiple-Zone
Kiln Thermocouple Failure
The kiln will continue to fire as long as at least one ther-
mocouple is working. The lines following "TC" represent
the position inside the kiln of the thermocouple(s) that
failed.
Top line = top thermocouple
Middle line = middle thermocouple
Bottom line = bottom thermocouple
Top thermocouple failed
Middle thermocouple failed
Bottom thermocouple failed
Top and middle thermocouples failed
Top and bottom thermocouples failed
Top, bottom and middle thermocouples failed
On Sentry controllers with pre-18D software, "TC" is
followed by a number and a line. You can check the soft-
ware version of your controller by using the SOFT Option.
See page 18.
Multiple-zone controllers with 18D or earlier solftware:
TC 1¯ Top Thermocouple Failed
TC 2- Middle Thermocouple Failed
TC 3_ Bottom Thermocouple Failed
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