H134-E1-01A E5_N UsersManual (986777), страница 15
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. . . . . . . .111Section 4-1Shifting Input Values4-14-1-1Shifting Input ValuesShifting InputsThe input shift matched to the sensor currently selected in the “input type”parameter is displayed.• A 2-point shift is applied for infrared temperature sensors. A 2-point shiftcan also be used if the “input shift type” parameter (advanced functionsetting level) is set to INS2 for a thermocouple or platinum resistancethermometer.One-point shiftinsTemperatureinput shift• With a 1-point shift, the value set for the “temperature input shift” parameter (adjustment level) is applied to each point in the entire temperatureinput range. For example, if the input shift value is set to 1.2°C, the process value is treated as 201.2°C after the input shift is applied when themeasured process value is 200°C.TemperatureUpper limitAfter shiftingLower limitBeforeshiftingInput shift valueInput0100Operating ProcedureOperation LevelCIn this example, the input from a K sensor is shifted by 1°C using a 1-pointinput shift.Operation Level302001.
Press the O key to move from the operation level to the adjustment level.Adjustment LevelAdjustment levell.adj displayCTemperatureins input shift2. Select the “temperature input shift” parameter by pressing the M key.0.0Cins3. Press the U or D key to set 1.0.1.0Operation LevelC314. To return to the operation level, press the O key. The process value is1°C larger than before the shift was applied.20067Section 4-1Shifting Input ValuesTwo-point shiftinshUpper-limittemperatureinput shift valueinslLower-limittemperatureinput shift value• Separate shift values can be set for the upper limit and lower limit of thesensor input range for an infrared sensor as well as for a thermocouple orplatinum resistance thermometer with the “input shift type” set to INS2.
Ifdifferent shift values are set for the upper limit and lower limit, then theslope of the line will be different before and after applying the input shift.For example, if the upper-limit value is set to 2°C and the lower-limit valueis set to 1°C, the input temperature will be shifted by 1.5°C for a 50%input, i.e., by the average of the upper-limit and lower-limit values.• Set the upper-limit value in the “upper-limit temperature input shift value”parameter and the lower-limit value in the “lower-limit temperature inputshift value” parameter.TemperatureUpper-limit temperatureinput shift valueUpper limitAfter shiftingBefore shiftingLower limit04-1-2InputLower-limit temperature 100input shift valueHow to Calculate Input Shift Values for a 2-point ShiftWhen an ES1B Infrared Temperature Sensor is connected to the E5CN, anoffset of several degrees to several tens of a degree can occur.For this reason, offset the readout value using a 1-point or 2-point shift asdescribed in this section.
This offset occurs because a bias current for detecting a Controller sensor error flows to the output impedance of the infraredtemperature sensor.Preparations1,2,3...1. Set a temperature range matching the input specifications of the infraredtemperature sensor. (The ES1B can be used with the E5AN only for a thermocouple/resistance thermometer multi-input type input.)2. Prepare a thermometer capable of measuring the temperature of the control target as shown in Figure 1 so that a 1-point shift or 2-point shift canbe carried out.3.
The E5@N-@@P@ has a built-in external power supply for ES1B InfraredTemperature Sensors. These E5CN models can be used as the powersupply when using ES1B. When ES1B are used with other E5CN models,provide a separate power supply for the Infrared Temperature Sensors.68Section 4-1Shifting Input Values(C) Control targetInfrared TemperatureSensorPower supply(B) ThermometerOutput(A) E5CN/AN/EN Temperature ControllerFigure 1 Offset Configuration for an Infrared Temperature SensorMethod for a 1-point Shift1,2,3...CinshUpper-limittemperatureinput shiftvalue2. Check the control target temperature (B) and the Controller readout (A).Subtract the Controller readout temperature (A) from the control targettemperature (B), and set insl and insh to the result as the input shift value.
The shift is illustrated in Figure 2.inslLower-limittemperatureinput shiftvalue3. After setting the input shift values, check the Controller readout (A) and thecontrol target temperature (B). If they are almost the same, this completesshifting the temperature input.10.0C1. In the configuration shown in Figure 1, bring the set point to near the valueat which the temperature of the control target is to be controlled. Assumethat the control target temperature (C) and the thermocouple temperature(B) are the same.10.0Controller readout (A)After shiftingController readout aftershifting (e.g., 120°C)Controller readout beforeshifting (e.g., 110°C)0Input shift value (e.g., 10°C)Before shiftingNear set point(e.g., 120°C)Control target temperature (B)Figure 2 Illustration of 1-Point Shift69Section 4-1Shifting Input ValuesMethod for a 2-pointShiftUse a 2-point input shift if you want to increase the accuracy of the readoutvalues across the range of the sensor.1,2,3...1.
Shift the Controller readout at two points, near room temperature and nearthe value at which the temperature of the control target is to be controlled.For this reason, check the control target temperature (B) and Controllerreadout (A) with the control object temperature near room temperature andnear the set point.2.
Then use the following formulas to calculate the upper-limit and lower-limittemperature input shift values based on the readout temperatures and desired temperatures.The shift is illustrated in Figure 3.Controller readout (A)Set temperature upperlimit YH (e.g., 260°C)After shiftingUpper-limit temperatureinput shift value inshController readout aftershifting (e.g., 110°C)Before shiftingController readout beforeshifting (e.g., 105°C)Controller readout beforeshifting (e.g., 40°C)Controller readout aftershifting (e.g., 25°C)Lower-limittemperature inputshift value inslControl target temperature (B)0 X1 Room temperature (e.g., 25°C) X2 Near set point (e.g., 110°C)Set temperature lowerlimit YL (e.g., 0°C)Figure 3 Illustration of 2-Point Shifta.
Lower-limit temperature input shift valueinsl =b.YL − Y1× {(X2 − Y2) − (X1 − Y1)} + (X1 − Y1)Y2 − Y1Upper-limit temperature input shift valueinsh =YH − Y1× {(X2 − Y2) − (X1 − Y1)} + (X1 − Y1)Y2 − Y13. After setting the calculated values to insl and insh, check the Controllerreadout (A) and control target temperature (B).4. Here, offsets are set at two points, near room temperature and near the setpoint.
To improve accuracy within the measurement temperature range,another point in the measurement temperature range other than the setpoint should be set instead of room temperature.Example of a 2-pointTemperature InputShiftIn this example, we use the ES1B K 140 to 260°C specification.
In equations 1and 2, the set temperature lower limit YL is 0°C and the set temperature upperlimit YH is 260°C. Check the temperature of the control target.The temperature input offset values can be calculated as shown below whenthe Controller readout Y1 is 40°C for a room temperature X1 of 25°C andwhen the Controller readout Y2 is 105°C for a set point temperature X2 of110°C.Lower-limit Temperature Input Shift ValueCinsl-27.370Lower-limittemperatureinput shiftvalueinsl =0 − 40× {(110 − 105) − (25 − 40)} + (25 − 40) = −27.3 (°C)105 − 40Section 4-2Alarm HysteresisUpper-limit Temperature Input Shift ValueCUpper-limitinsh temperatureinput shift52.74-2insh =260 − 40× {(110 − 105) − (25 − 40)} + (25 − 40) = 52.7 (°C)105 − 40valueAlarm Hysteresis• The hysteresis of alarm outputs when alarms are switched ON/OFF canbe set as follows:Upper-limit alarmAlarm hysteresisLower-limit alarmONONOFFOFFAlarm valueAlarm hysteresisAlarm value• Alarm hysteresis is set independently for each alarm in the “alarm hysteresis 1" to “alarm hysteresis 3” parameters (advanced function settinglevel).• The default is 0.2 (°C/°F) for Controllers with Thermocouple/ResistanceThermometer Multi-Inputs and 0.02% FS for Controllers with AnalogInputs.4-2-1Standby Sequence• The standby sequence can be used so that an alarm will not be outputuntil the process value leaves the alarm range once and then enters itagain.• For example, with a lower limit alarm, the process value will normally bebelow the set point, i.e., within the alarm range, when the power supply isturned ON, causing an alarm to be output.If the lower limit alarm with a standby sequence is selected, an alarm willnot be output until the process value increases above the alarm set value,i.e., until it leaves the alarm range, and then falls back below the alarm setvalue.Restart4-2-2• The standby sequence is canceled when an alarm is output.
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