Analog Inputs - Mitsubishi Electric a2 Series Programming Manual

α
2 Simple Application Controllers

3.6.10 Analog Inputs

The Analog Inputs can be configured for three different modes: Normal, TC and PT100.
Normal mode is used for ordinary analog signals. TC and PT100 modes should be used with
the AL2-2TC-ADP and AL2-2PT-ADP modules respectively. For more information on these
modules, refer to the Alpha Hardware Manuals and the individual installation manuals. The
following changes should be made in the Stop mode. Only the "OffsetFine" adjust works in
both RUN and STOP modes.
To Set/Change the modes of the Analog Inputs (Stop Mode only):
1 ) Select "Others..." from the TopMenu while in Stop Mode.
2 ) Select "Analog In."
3 ) Choose the appropriate input and press OK.
4 ) "Mode" will be the only option displayed if the analog input was previously set on "Normal."
Select "Mode" by pressing the OK button. Then, select the appropriate mode setting.
"Calibrate" and "OffsetFine" should appear on the Analog Input settings menu.
Offset Calibration of the PT 100 and TC inputs (Stop Mode only):
1 ) Before beginning, follow the instructions on preparing the hardware for calibration in the α2
Hardware Manual, Chapter 12 for the PT100 input and Chapter 13 for the TC input.
2 ) Select "Others..." from the TopMenu while in Stop Mode.
3 ) After setting the mode to TC or PT100 (See the method for changing modes in the previ-
ous description.), select "Calibrate" from the Analog input settings menu.
4 ) Select -50°C and press OK. This completes the offset calibration procedure.
Gain Calibration of the PT100 and TC inputs (Stop Mode only):
1 ) Before beginning, follow the instructions on preparing the hardware for gain calibration in
the α2 Hardware Manual, Chapter 12 for the PT100 input and Chapter 13 for the TC input.
2 ) Select "Others..." from the TopMenu while in Stop Mode.
3 ) After setting the mode to TC or PT100 (See the method for changing modes in the previ-
ous description.), select "Calibrate" from the Analog input settings menu.
4 ) Select 200°C for the PT100 input or 450°C for the TC input and press OK. This completes
the gain calibration procedure.
Fine Adjust for the Offset:
1 ) Select "Others..." from the TopMenu either in Stop or Run Mode.
2 ) After setting the mode to TC or PT100, select "OffsetFine" from the Analog input settings
menu.
3 ) "OffsetFine" can be adjusted while in Run or Stop Mode. Use the + and - buttons to select
the appropriate offset value.
Note:
The fine adjust step size for the PT100 mode is 0.5°C and 1.0°C for the TC mode. The
Fahrenheit step sizes are 0.9°F and 1.8°F respectively.
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