ABB DSCA33 High Performance Signal Conditioners

Description

Each DSCA33 True RMS input module provides a single channel of AC

input which is converted to its True R S D value, filtered, isolated,

amplified, and converted to standard process voltage or current output

(Figure 1).

The field voltage or current input signal is processed through an A

coupled preamplifier and R S converter on the field side of the

isolation barrier. The converted dc signal is then filtered and chopped by a

proprietary chopper circuit and transferred across the transformer

isolation barrier, suppressing transmission of common mode spi es and

surges. The computer side circuitry reconstructs, filters and converts the

Features

Interfaces RMS Voltage (0  300V) or

RMS Current (0  5A)

Designed for Standard Operation with

Frequencies of 45Hz to 1000Hz

(Extended Range Operation to 20kHz)

ompatible with Standard urrent and Potential

signal to industry standard outputs.

Module output is either voltage or current. For current output models a

dedicated loop supply is provided at terminal 3 (+OUT) with loop return

located at terminal  O T. The systemside load may be either oating

or grounded.

Special input circuits provide protection against accidental connection of

power line voltages up to

by ANSII

A

and against transient events as defined

. . . Protection circuits are also present on the signal

output and power input terminals to guard against transient events and

power reversal. Signal and power lines are secured to the module using

screw terminals which are pluggable terminal blocs for ease of system

assembly and reconfiguration.

DS A

modules have excellent stability over time and do not reuire

recalibration, however, both ero and span settings are adustable to

accommodate situations where fine tuning is desired. The adustments

are made using potentiometers located under the front panel label and

are non-interactive for ease of use.

Due to circuit limitations, DSCA33-04x and -05x are not ATEX compliant.

Transformers

Industry Standard Output of 0 to 1mA,

0 to 20mA, 4 to 20mA, 0 to +5V, or 0 to +10V

. Factory alibrated Accuracy

(Accuracy Class 0.2)

Adustable ero and Span

1500Vrms Transformer Isolation

Input Overload Protected to 480V

(Peak AC & DC) or 10Arms Continuous

100dB CMR

ANSI/IEEE C37.90.1 Transient Protection

Easily Mounts on Standard DIN Rail

C-UL-US Listed and CE Compliant

ATEX Compliant (all models except

DSCA33-04x, -05x)