Impulse DSCA33 - Manual

High Performance Signal Conditioners DSCA
For information call 800-444-7644 134
DSCA33
Isolated True RMS Input Signal Conditioners
Description
Each DSCA33 True RMS input module provides a single channel of AC input
which is converted to its True RMS DC 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 AC coupled
pre-amplifier and RMS 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 spikes and surges. The computer side circuitry
reconstructs, filters and converts the 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 4 (-OUT). The system-side load may be either floating or grounded.
Special input circuits provide protection against accidental connection of
power-line voltages up to 480VAC and against transient events as defined
by ANSI/IEEE C37.90.1. 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 blocks for ease of system assembly and
reconfiguration.
DSCA33 modules have excellent stability over time and do not require
recalibration, however, both zero and span settings are adjustable to
accommodate situations where fine tuning is desired. The adjustments are
made using potentiometers located under the front panel label and are
non-interactive for ease of use.
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)
• Compatible with Standard Current and
Potential Transformers
• Industry Standard Output of either 0-1mA,
0-20mA, 4-20mA, 0-5V, or 0-10VDC
• ±0.25% Factory Calibrated Accuracy
(Accuracy Class 0.2)
• ±5% Adjustable Zero and Span
• 1500Vrms Transformer Isolation
• Input Overload Protected to 480V
(Peak AC & DC) or 10A RMS Continuous
• ANSI/IEEE C37.90.1 Transient Protection
• Easily Mounts on Standard DIN Rail
• C-UL-US Listed
• CE and ATEX Compliant
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Figure 1: DSCA33 Block Diagram
* Current Input Models only
** Add jumpers for Current Input Modules
(provided with DSCA33-06, -07)