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SC-AI
Analog Isolation Module
Product Description
This document describes the hardware installation procedures for the SC-AI Analog Isolation Module.
The analog isolation module is a 3-way isolating analog signal re-scaling module with one input-output channel. It will accept one analog voltage or current
input signal, isolates it and re-scales it to another voltage or current output signal. The I/O signals have several pre-calibrated fixed ranges or may be
custom calibrated for various offsets and spans and can be direct or reverse acting to provide signal inversion.
The device has an on-board transformer that provides power supply isolation and input-output signal isolation. The module also includes a regulated +24
Vdc power output that can be used to power a transducer or a resistance input. It features top-adjust trim-pots for offset and gain control, source or sink
capabilities and an LED power indicator. Various I/O signal types are easily selected with DIP switches. The product comes with standard snap-track for
easy mounting.
General Installation Requirements
For proper installation and subsequent operation of each device, pay special attention to the following recommendations:
Upon unpacking the product, inspect the contents of the carton for shipping damages. Do not install damaged device.
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Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.
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Ensure that all equipment is installed according to local, regional, and national regulations.
Personal injury or loss of life may occur if you do not follow a procedure as specified.
Equipment damage or loss of data may occur if you do not follow a procedure as specified.
Take reasonable precautions to prevent electrostatic discharges to the controller when installing, servicing or operating
the controller. Discharge accumulated static electricity by touching one's hand to a well-grounded object before working
with the controller.
Figure 1: SC-AI Analog Isolation Module
I n s t a l l a t i o n G u i d e
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Summary of Contents for Distech Controls SC-AI
- Page 1 Figure 1: SC-AI Analog Isolation Module Product Description This document describes the hardware installation procedures for the SC-AI Analog Isolation Module. The analog isolation module is a 3-way isolating analog signal re-scaling module with one input-output channel. It will accept one analog voltage or current input signal, isolates it and re-scales it to another voltage or current output signal.
- Page 2 Mounting Instructions The snap-track device may be mounted in any position. Use only fingers to remove the PCB from the snap track, do not pry on the PCB with tools. Do not flex the PCB during removal or installation. Slide the PCB out of the snap-track or push against one side of the snap-track and lift the PCB out. See Figure 2.
- Page 3 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. Figure 5 Input Jumpers Settings.
- Page 4 Output Configuration The input must be configured before selecting the output configuration. Set the Output Jumpers For voltage output signal type set the output jumpers to the VOLT (0-20 volt) and SOURCE positions. For sourcing current output signal type set the output jumpers to the mA (0-20 mA) and SOURCE position. For sinking output current signal type, set the output jumpers to the VOLT and SINK positions.
- 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.
- Page 6 Wiring Deactivate the 24 Vac power supply until all connections are made to the device to prevent electrical shock or equipment damage. Follow proper electrostatic discharge handling procedures when installing the device or equipment damage may occur. Use 22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with wiring used to supply inductive loads such as motors.
- Page 7 ©, Distech Controls 2020 All rights reserved. While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising from the use of this manual. Persons using this manual are assumed to be trained HVAC specialist / installers and are responsible for using the correct wiring procedures and maintaining safe working conditions with fail-safe environments.
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