Omron E5AR - MANUAL 2 User Manual page 106

● Obtaining input
shift values (2-
point correction)
[Preparations]
● Procedure for
using 2-point
correction
Temperature readings are taken using the E5AR/ER at any two points
and the actual temperature at the required location (the object) is
measured at the same two points.
1. Set the input type based on the sensor.
2. Obtain a temperature sensor that can measure the temperature of the
object similar to that shown in Figure 1.
500 C
550 C
(Figure 1. Configuration for input shift)
1. Correction will be performed of the temperature readings at two points: one
near room temperature and one near the desired SP. Measure the temperature
of the object when it is near room temperature and when it is near the SP (B),
and check the corresponding readings of the controller (A).
shift
2. Set "Input 1" to the difference between the temperature of the object
(B) and the controller reading (A) when near room temperature,
Object temperature (B)
and set "Input value for input shift 1" to the controller reading (A).
3. Set "Input shift 2" to the difference between the temperature of the object (B)
and the corresponding controller reading (A) when near the SP,
Object temperature (B)
and set "Input value for input shift 2" to the controller reading (A).
4. After configuring the settings, check the reading of the controller (A) and
the temperature of the object (B).
5. Correction has now been performed at two points, near room temperature
and near the SP. If you wish to improve the accuracy near the SP, establish
two more correction points above and below the SP. Figure 2 illustrates the
correction.
Temperature indicated on machine (A)
Indicated temperature
after adjustment
(ex. 550.0 C)
Indicated temperature
before adjustment
(ex. 500.0 C)
Indicated temperature
before adjustment
(ex. 40.0 C)
Indicated temperature
after adjustment
Room temperature
(ex. 25.0 C)
(ex. 25 C)
Input shift
input value 1
(Image adjustment by point adjustment of Fig. 2.2)
5.1 Input adjustment functions
(A) E5AR Digital
Controller
(B) Thermometer
Controller reading (A)
Controller reading (A)
Before adjustment
Input shift value 2
Input shift
value 1
Proximity of SP
(ex. 550 C)
Input shift
input value 2
After adjustment
Temperature
indicated on
thermometer (B)
5-3