Distech Controls SC-AI Installation Manual page 5

To calibrate the adjustable offset:
1. Ensure the Input Configuration section is completed first.
2. Set the output DIP switches 5-8 to the ON position
3. Connect 24 Vac power to the device and turn the power on.
4. For voltage output signal type, connect a voltmeter to measure the output voltage signal from OUT +to OUT -. For current sourcing output signal type,
connect a mA meter from OUT + to OUT - to measure the output current signal. For current sinking output, temporarily set the output to sourcing (and
mA) and measure the output current as previously described, or measure the current at the OUT+ terminal directly in sinking mode.
5. Apply the minimum input signal to the device input and then adjust the OFFSET pot for the correct minimum output. The output offset value is now
calibrated.
Select a Preset Output Span
If the SPAN is 1, 3, 4, 5, 6, 7, 8, or 10 volts or 4, 12, 16, or 20 mA, then set the output DIP switches according to the following chart. Switches 1 to 4 have
been set previously for the OFFSET. Remember, SPAN = maximum minus minimum.
Select an Adjustable Output Span
If the required SPAN is not equal to one of the preset values in the above chart, then select the adjustable span as shown in the following chart. An
example of this would be if the output signal is to be 3-15 volts, the OFFSET = 3 V and SPAN = 12 V. In this case, since SPAN = 12 V, select the Adj. 10-
20 V option.
To Calibrate the Adjustable Span:
1. Ensure the Input Configuration section is completed first.
2. Ensure the output DIP switches 1-4 have been set previously for the offset.
3. Connect 24 Vac power to the device and turn the power on.
4. For voltage output signal type, connect a voltmeter to measure the output voltage signal from OUT+ to OUT -. For current sourcing output signal type,
connect a mA meter from OUT + to OUT – to measure the output current signal. For current sinking output, temporarily set the output to sourcing (and
mA) and measure the output current as previously described or measure the current at the OUT+ terminal directly in sinking mode.
5. Apply the maximum input signal to the device input and then adjust the SPAN pot for the correct maximum output. The output span value is now
calibrated.
Reversing the Output Signal:
If the required output signal is to be reversed, then simply move the NORM/REV jumper from the NORM position to the REV position. This will allow, for
example, an input signal of 0-5 V and an output signal of 5-0 V.
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Figure 12 0- Preset Output Span Settings.
Figure 13 0- Adjustable Output Span Settings.