Ceramics: 06/2004
8
Storing of
programmes
The TC 504 automatically stores all changeable
values of the firing curve.
Display of kiln
temperature
The red display permanently shows the values of the
process. These are for example: current kiln
temperature, heating performance, status of control
outlets etc. You can retrieve the kiln temperature
values one by one by pressing the “zone” (2) key.
The TC 504 also supports multi-zone kilns. The
symbols to the left of the red display indicate which
zone belongs to which kiln value. The sequence of
the displayed process values can be determined in
the configuration. By pressing the key “O” (10)
followed by the key “zone” (2) the following values
will appear on the display (11).
Current kiln temperature
Display of current actual value. For multi-zone kilns
the actual values can be retrieved by pressing the
“zone” key (2) several times (for zone number see
symbol to the left).
„over“: No sensor connected, sensor broken, sensor connection
broken or temperature range exceeded.
„under“: Sensor / supply line connected incorrectly. When you
reverse the polarity please make sure that you connect according
to the colour coding. If you connect incorrectly on both sides (!)
the controller cannot detect this and will overheat the kiln.
„invalid“: Value measurement invalid, measured value of sensor
invalid or failure of measurement device.
Current kiln heating performance percentage.
For switching kilns the percentage of the heating
performance is displayed as the relation
impulse/break (e.g. 50% = kiln 15 s on and 15 s off).
„channel off“: No controller routine active, e.g. during delay time
or when the programme has not been started.
„channel over“: Controller channel switched off, due to
exceeded temperatures (e.g. due to “over” error at measurement
input.
„channel gradient error“: For safety reasons the controller
checks the minimal temperature increase during full load. If the
temperature increase drops under 3°C per 15 min the firing will
be aborted showing this error message. Typical reasons for this
error: The heating spiral is too old or broken, a phase of the
mains supply or the power relay has failed, short circuit of
sensor. No controller failure!
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