3.9.4
Over-Temperature Protection Calibration
The over-temperature protection circuit can be calibrated in the same way as the
main controller. However, this is not normally necessary as the level of accuracy
required for over-temperature protection is not as critical as it is for the main
control temperature.
l
Start at the home display.
l
Press and hold the Over-Temperature key.
l
Press and hold the Page key for 1.5 seconds.
l
Repeatedly press the Page key until
CL.St
is displayed.
Now follow the procedure in "Customer Calibration".
3.9.5
Over-Temperature Activation
During normal operation, the over-temperature indicator is green. If the temperature
of the furnace or oven goes above the over-temperature limit, the over-temperature
circuit activates. The power supply to the heating elements is switched off and the over-
temperature indicator changes to flashing red.
Pressing the over-temperature key shows
Ott
in the display to indicate that the over-
temperature has been triggered.
The reason for the over-temperature activation must be investigated; an incorrect
setting in the over-temperature limit is may be the cause. When you are satisfied with
the reason for the over-temperature activation it can be reset.
35
3.0 301 Controller