1-Point Shift Method - Omron E5CN User Manual

Shifting Input Values
4-1-3

1-point shift method

1,2,3...
Adjustment level
Upper-limit
insh
temperature
input shift value
10
Lower-limit
insl
temperature
input shift value
10
4-1-4 2-point shift method
1,2,3...
42
1. In the configuration shown in Figure 1, bring the set point to near the value
at which the temperature of the control target is to be controlled. Let's as-
sume that the control target temperature (C) and the control target temper-
ature (B) are matching.
2. Check the control target temperature (B) and the controller readout (A).
Take the following value as the input shift value, and set the same numer-
ical values to "insl" and "insh".
control target temperature (B) - controller readout (A)
Figure 2 shows the effect of 1-point temperature input shift.
3. After you have set the input shift values, check controller readout (A) and
control target temperature (B). If they are almost the same, this completes
temperature input shift.
Controller readout (A)
Temperature readout
after shift (e.g. 120°C)
Temperature readout
before shift (e.g. 110°C)
0
Figure 2 1-point Temperature Input Shift
Use 2-point input shift if you want to increase the accuracy of the readout val-
ues across the range of the sensor.
1. Shift the controller readout by two points, near room temperature and near
the value at which the temperature of the control target is to be controlled.
For this reason, bring the control target temperature to near room temper-
ature and to near the set point, and check control target temperature (B)
and controller readout (A).
2. Using equations (1) and (2) calculate the upper- and lower-limit tempera-
ture input shift values from the readout and temperature to be shifted that
you obtained in step 1.
Figure 3 shows the effect of shift by 2-point temperature input shift.
Controller readout (A)
Set temperature
upper limit YH
(e.g. 260°C)
Temperature readout
after input shift X2 (e.g. 110°C)
Temperature readout
before input shift Y2 (e.g. 105°C)
Temperature readout
before input shift Y1 (e.g. 40°C)
Temperature readout
after input shift X1 (e.g. 25°C)
Lower-limit temperature
input shift value
Figure 3 2-point Temperature Input Shift
After shift
Input shift value (e.g. 10°C)
Before shift
Near set point
(e.g. 120°C)
0 X1 room temperature
(e.g. 25°C)
Near X2 set point (e.g. 110°C)
Set temperature
lower limit YL (e.g. 0°C)
Section 4-1
Temperature readout of
control target (B)
After shift
Upper-limit temperature
input shift value
Before shift
Temperature readout of
control target (B)