Temperature Controller - Staveb AG

Chapter 4Parameter Adjustments and ApplicationConsiderationsShifting Input ValuesOverviewThe Input Shift parameter allows you to configure the controller tocompensate for possible deviation of the measured temperature (PV) to theactual temperature at the source (control target). The controller supports twotypes of input shifts: 1-point and 2-point. The input shift type is automaticallymatched to the sensor currently selected by the Input Type parameter (setvalue — see Table A.B, List of Input Types).1-Point (Uniform) ShiftOverviewFigure 4.1With 1-point shift operation, the Temperature Input Shift parameter(Adjustment function group) is applied to the entire temperature input rangein a uniform or consistent manner. In other words, the adjusted value isapplied equally to each input/sensor value read by the controller and displayedas such. For example, if the input shift value is set to 1.2°C, the process value istreated by the controller as 201.2°C after input shift is applied when themeasured process value is 200°C. (See Figure 4.2.)Figure 4.2 One-Point ShiftTemperatureUpper-limitvalueLower-limitvalue0After shiftBeforeshiftInput shift value100Input4-1 Publication 900-UM003C-EN-E - January 2004