Distech Controls SC-AI-420 Manuel utilisateur

Installation Guide

SC-AI-420

Analog Isolation Module

Figure 1: SC-AI-420 Analog Isolation Module

Product Description

This document describes the hardware installation procedures for the SC-AI-420 Analog Isolation Module.

The analog isolation module is a 2 wire loop-powered 4-20 mA signal isolator with one input/output channel. It will accept one analog current or voltage

input signal, isolate it and sink a current output signal. The input has several fixed ranges for various applications.

The device derives operating power from the output current loop that is provided by the receiving device and has an on-board transformer that provides

complete input/output signal isolation. Both the input and output are sinking type and the input 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.

- Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.

- 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.

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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. Ensure any metallic mounting hardware does not contact the underside of the PCB.

Figure 2: Transmitter PCB.

Avoid mounting in areas where the device is exposed to vibrations or rapid temperature changes. Mount the snap track with the PCB removed using two

screws as shown in Figure 3.

Figure 3: Mounting Snap Track.

Once the snap track is mounted, place the bottom edge of the PCB into the bottom slot on the snap track and then gently press the top edge in both

corners until the PCB snaps into the top slot of the snap track. See Figure 4.

Figure 4 Mounting PCB onto Snap Track.

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Wiring

- Deactivate any power supplies 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.

- 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.

- Make all connections in accordance with national and local codes.

- The analog input signal is connected to the IN+ and IN- terminals and the analog output signal is connected to the OUT+ and OUT- terminals. The

input and output signals are completely isolated from each other.

Figure 5 Wiring Diagram.

Factory Configurations

The Isolation Module is preset for 4-20 mA input / 4-20 mA output. The input signal may be changed by using the DIP switches as shown in Figure 5.

Calibration

The isolator is factory calibrated to ±0.1% accuracy on the 0-5 vdc input type. Using any other range will result in a transfer accuracy or <±1%. If a higher

accuracy signal is required simply apply the full-scale input signal and adjust the output signal to 20.00 mA using the calibration pot.

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. Distech Controls reserves the right to change, delete or add to the information in this manual at any time without notice.

Distech Controls, the Distech Controls logo, and Innovative Solutions for Greener Buildings are trademarks of Distech Controls. All other trademarks are property of their

respective owners.

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Dimensions

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