Example Of 2-Point Temperature Input Shift - Omron E5CN User Manual

Shifting Input Values
4-1-5

Example of 2-point temperature input shift

Adjustment level
Lower-limit tem
insl
perature input
shift value
27
Upper-limit tem
insh
perature input
shift value
53
• Use the following equation to calculate the lower-limit temperature input
shift value.
YL - Y1
× {(X2 - Y2) - (X1 - Y1)} + (X1 - Y1)...equation 1
insl =
Y2 - Y1
• Use the following equation to calculate the upper-limit temperature input
shift value.
YH - Y1
× {(X2 - Y2) - (X1 - Y1)} + (X1 - Y1)...equation 2
insh =
Y2 - Y1
3. After you have set the calculated values to "insl" and "insh", check con-
troller readout (A) and control target temperature (B).
4. Although the input shift was carried out at two points, close to room tem-
perature (ambient temperature), and near to the set point, select points
close to each end of the sensor range to improve accuracy across the full
range of the sensor measurement range.
Note Before selecting these values, check that they will not damage the
controller if applied.
In this example, we use the ES1A K 0 to 260 ° C specification.
YL an YH in equations 1 and 2 are set temperature lower limit YL is 0 ° C and
set temperature upper limit YH is 260 ° C. Check the temperature of the control
target.
When the room temperature X1 is 25 ° C, the readout on the controller Y1 is
40 ° C, and when the temperature near the set point X2 is 110 ° C, the readout
on the controller Y2 becomes105 ° C.
Lower-limit temperature input shift value
0 - 40
× {(110 - 105) - (25 - 40)} + (25 - 40) = -27.3 (°C)
insl =
105 - 40
Upper-limit temperature input shift value
260 - 40
× {(110 - 105) - (25 - 40)} + (25 - 40) = 52.7 (°C)
insh =
105 - 40
Section 4-1
43