Temperature Controller - Staveb AG

4-6 Parameter Adjustments and Application ConsiderationsFigure 4.12 Two-Point Temperature Input ShiftController readout (A)Temperature readoutafter input shift X2 (e.g. 110°C)Temperature readoutbefore input shift Y2 (e.g. 105°C)Set temperatureupper limit YH(e.g. 260°C)After shiftUpper-limit temperatureinput shift valueBefore shiftTemperature readoutbefore input shift Y1 (e.g. 40°C)Temperature readoutafter input shift X1 (e.g. 25°C)Lower-limit temperatureinput shift valueFigure 4.13Temperature readout of0 X1 room temperaturecontrol target (B)(e.g. 25°C)Near X2 set point (e.g. 110°C)Set temperaturelower limit YL (e.g. 0°C)– Equation 1: Use the following equation to calculate the lower-limittemperature input shift value.YL – Y1cnsl = ------------------- × {( Y2 – Y1X2 – Y2 )–( X1 – Y1)} + ( X1 – Y1)– Equation 2: Use the following equation to calculate the upper-limittemperature input shift value.YH – Y1cnsh = ------------------ × {( Y2 – Y1X2 – Y2 )–( X1 – Y1)} + ( X1 – Y1)Adjustment function groupUpper-limittemperatureinput shift valueLower-limittemperatureinput shift value3. After you have configured the calculated values for insl and insh,check/compare controller readout (A) with the control targettemperature (B).4. Although the input shift was carried out at two points, close to roomtemperature (ambient temperature), and near to the set point, you maywant to consider selecting points close to each end of the sensor rangeto improve accuracy across the full range of the sensor measurementrange.Note: Before selecting these values, check that they will not damage thecontrol application if applied.Publication 900-UM003C-EN-E - January 2004