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controller thinks the bottom section actually reached the ending temperature when it really was
below the ending temperature. To correct this problem, a negative thermocouple offset is required.
This offset will be subtracted from the actual reading and will lower the temperature reading in that
section. A negative offset will cause a section to fire to a higher temperature increasing the heat-
work for that section. A positive offset will cause a section to fire to a lower temperature
decreasing the heat-work for that section. To return all t/c offsets to zero, press Menu, “RSET”
will be displayed, press ENTER; RSET also turns the error codes (ERCd) on.
5. THREE THERMOCOUPLES
Besides better measuring of the temperature, the zone control also offers security through its three
thermocouples. With a single zone controller, a firing will be stopped if the thermocouple (t/c)
fails. The zone control with 3 t/c’s, will continue to fire if one or two of its thermocouples fail
during a firing. If the top or bottom thermocouple fails, that section will be controlled by the
middle t/c. If the middle thermocouple fails the middle section will be controlled by the top t/c. If
the controller is at “IdLE” and a t/c fails, the display will alternate between FAIL and the number
of the failed t/c (1,2,3). The temperature of each zone can be viewed. The temperature will
alternately flash with the currently selected zone. To select zone 1, press the “1” key and TC 1
will alternate with the current zone 1 temperature. For zone 2 press the “2” key, for zone 3 press
the “3” key.