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α
2 Simple Application Controllers
6) Configure the input for temperature sensing with the AL2-2PT-ADP module by selecting
"Mode" and choosing "PT100" from the following screen.
7) After setting the mode to "PT100", select "Calibrate" from the Analog input settings menu.
8) Select "-50°C" from the Calibrate menu as in "Controller Setup" in the figure 12.5 and press
OK. There should be a confirmation message that reads "OK." If not, refer to the Applicable
Error Checks section below. This completes the offset calibration procedure. To calibrate
the offset for channel 2, repeat the steps above replacing L1-, L1+ and I1- with L2-, L2+ and
I2- respectively. When the calibration is finished, move the jumper to the "LINE" pins.
Figure 12.6: Jumper position after calibration
It is usually necessary to perform the Gain Adjustment when performing the Offset
Adjustment. See section 12.4.4 for more details.
12.4.5
Gain Adjustment
Note
If Offset adjustment is complete, then step 3 ~ 4 are not needed.
1) To begin the calibration for channel 1, turn off the power to the α2 controller and the AL2-
2PT-ADP, remove the temperature sensor and shorten the pins L1- and I1-.
I 0 1
Mo d e
Hardware Setup
LINE
LINE
AL2-2PT-ADP 12
I 0 1
No r ma l
TC
PT 1 0 0
I 0 1
Mo d e
Ca l i b r a t e
O f f s e t
F i n e
ENG-68
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