Orton AutoFire Plus, User Manual

Page: 23 / 45

AutoFire® Kiln Controller User’s Guide
21
ALARM DESCRIPTIONS
The AutoFire® Kiln Controller Family includes a full alarm capability.
Temperature Deviation Alarms - FtH, FtC, LtdE, HtdE, tCdE, FtL
Temperature Deviation Alarms apply to both preset cone programs and user programs. These alarms occur
when the measured kiln temperature differs from the controller set-point temperature by more than the alarm
value. This deviation is typically factory-set at 100
°
F (56
°
C). It does not apply to tCdE or FtL. It is changed
through Options (Level 2 - tEdE).
EtH - Electronics Too Hot
verify that the temperature at controller is not higher than 85°C (185°F). If controller is cooler, most likely the
electronics board is experiencing electrical interference.
FtH - Failure To Heat
The alarm is caused by a temperature deviation during a ramp-up segment. This alarm occurs due to the
difference between the controller set-point temperature and the measured kiln temperature.
FtC - Failure To Cool
The Failure to Cool alarm is activated if the measured cooling rate is greater than the programmed rate by the
amount of the alarm difference.
LtdE - Low Temperature
The temperature deviation alarm occurs due to a low temperature deviation during a ramp-down or in a dwell
segment.
HtdE - High Temperature
The temperature deviation alarm occurs due to a high temperature deviation during a ramp-up or a dwell
segment.
TCdE - TC Deviation Alarm (UniTemp™ Models Only)
A temperature deviation alarm which occurs when the deviation between the top and bottom thermocouples is
equal to or greater than 60
°
C (108
°
F).
FtL - Firing Too Long
The Firing Too Long Alarm occurs when the measured heating rate is less than 15
°
C/hr AND the actual firing
time is at least 4 hours longer than the programmed time for the segment. When this occurs, the firing is aborted
and “FtL” is shown on the display. Under these conditions, it is unlikely the kiln will reach its programmed
temperature so the firing is stopped. The Firing Too Long alarm applies to both preset cone programs and user
programs.
Temperature Alarms - ALAr, FAIL, - - - -, tC0, tC1
Temperature Alarms apply to both preset cone programs and user programs.
ALAr - Kiln Temperature Threshold
The Kiln Temperature Threshold Alarm occurs when the kiln temperature is equal to or greater than kiln
temperature threshold value that is specified. When this condition is detected, the controller sounds an audible
alarm and alternately indicates ALAR and the current kiln temperature on the display. The alarm remains active
until the user acknowledges the alarm by pressing [ENTER].