Input Configuration - Distech Controls SC-AI Installation Manual

Input Configuration

Set the input jumpers:
For voltage input signal type set the input jumper to the VOLT (0-20 volt) position
For current input signal type set the input jumper to either the I_LOW (0-1 mA low current) or I_HIGH (0-20 mA high input current) position.
Set the DIP switches:
If the required preset input signal type is listed in the table below, then set the 8 switches according to the chart and the input will be correctly calibrated
for that signal type. For example, if the input signal is 0-1 V, then set the switch 2 ON and the others OFF and the input will be correctly calibrated for the
0-1 V range.
Select An Adjustable Input Range
If the required input signal is not listed in the chart above, then one of the adjustable ranges must be used. There are three adjustable ranges for voltage
and one for current. Note that the minimum voltage span (maximum - minimum) is 1 volt and the minimum current span is 4 mA.
For voltage input, determine the maximum input signal and select the adjustable range accordingly. For example, if the input signal range will be 3-9 V
then the maximum input will be 9 volts and the Adj. 10 V max range will be selected. Set the switches according to the chart below. For current input, set
the switches according to the Adj. 4-20 mA range.
To Calibrate the Adjustable Ranges
1. Configure the output signal type for 0-5 V by setting the output jumpers to VOLT and SOURCE. Then set the output DIP switches according to the
Output DIP Switch Settings chart for the 0-5 V preset range.
2. Ensure the input jumper is set to VOLT o rI_HIGH as required and that the input DIP switches are set according to the selected adjustable range.
3. Rotate the MAX pot fully counter-clockwise (the factory setting).
4. Connect 24 Vac power to the device and turn the power on.
5. If the input signal range starts at 0 V or 0 mA (such as 0-7 volts), then skip to step 7. If the input signal does not start at 0 V or 0 mA (such as 2-5 V),
then continue to step 6 to calibrate the minimum signal.
6. Change the input DIP switch 4 setting from OFF to ON. Apply the minimum input signal. Measure the DC voltage from TP1 (+) to TP2 (-) on the PCB.
Adjust the MIN pot to obtain 0 Vdc on the meter. The minimum value is now calibrated. Leave switch 4 in the ON position.
7. Connect a voltmeter to measure the output signal from OUT + to OUT -. Apply the maximum input signal and adjust the MAX pot until the meter reads
5.00 volts. The maximum value is now calibrated.
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Figure 5 Input Jumpers Settings.
Figure 6 0-1V range set-up.
Figure 7 0-1V Adjustable Ranges.