Alarms
880 Operation Manual Issue 7 EMC INDUSTRIAL GROUP LTD Page 17 of 25
SMALL DISPLAY Shows
program number (eg )
LARGE DISPLAY Shows
current kiln temperature
CONTROLLER STATE
Controller is stopped
CAUSE Electrical interference disrupted operation of controller or controller is faulty.
ALARM
NUMBER
Press alarm
key to view
REMEDY Check Thermocouple is separated from power cabling as described in
Cable Separation, page 19 or, if fault cannot be cleared, return to supplier with a written
description of fault and the fault alarm number.
Clock fail reset
Watch dog reset
Bad instruction reset
"
Unexpected interrupt reset
A/D fail
+
EEPROM fail
,
Requires factory calibration
Fault Diagnostics
When a fault occurs there are several values that should be looked at before the
firing is stopped or power is turned off.
This information will be useful to a service person to help with fault location at a
later date.
• Check program is correct.
• Note what stage firing is at. This is shown in small display.
• Note kiln temperature.
• Note control temperature by pressing the CONTROL TEMP key.
• Check if heat light is on or is being turned on and off.
• Check, if possible, power is applied to the elements when heat light is on.
• Note alarm number by pressing ALARM key. See Alarms, page 15.
• Note current kiln temperature ramp rate by pressing together the DOWN and
the ALARM keys.
• Check and apply remedy if fault is listed in Typical Faults List below.
Typical Faults List
FAULT CAUSE REMEDY
Kiln over fires by up to
100°C.
Thermocouple com-
pensating lead re-
verse connected.
Check the thermocouple connection. See
Thermocouple, page 21.
Displays and lights frozen
and no response from
any key press.
Electrical interfer-
ence or component
failure has locked out
the controller.
Check Thermocouple is separated from power
cabling as described in Cable Separation, page
19. Turn power off then on to restart controller. If
controller does not respond return to supplier with
a description of fault.
Heat light is on but kiln
temperature is not in-
creasing.
Mains power not
connected to heating
elements.
Check kiln door is closed properly, heating con-
tactor has operated, main supply switch is on and
the heater fuses are okay.
None of the indicator
lights illuminate and the
display remains blank
after mains power is
switched on.
Mains power is not
connected to control-
ler.
Check supply fuse and that power is on the con-
troller terminals. If power is okay the controller
may be faulty and should be returned to the sup-
plier with description of fault.
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