Impulse DSCA33 User Manual

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.

High Performance Signal Conditioners

▲

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

DSCA

Figure 1: DSCA33 Block Diagram

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* Current Input Models only

** Add jumpers for Current Input Modules

(provided with DSCA33-06, -07)

For information call 800-444-7644

High Performance Signal Conditioners

DSCA

Specifications

Module

Input

Signal Range 100mV to 300Vrms, 0 to 5Arms

Standard Frequency Range 45Hz to 1000Hz

Extended Frequency Range 1kHz to 20kHz

Impedance 1 MΩ ±1% // <100pF (-01 thru -05), 0.10Ω (-06), 0.025Ω (-07)

Coupling AC

Protection

Continuous (-01 thru -05) 480V peak AC & DC max

Continuous (-06 thru -07) 10 Arms max

Transient (-01 thru -05) ANSI/IEEE C37.90.1

Transient (-06 thru -07) See note 1

Output

Signal Range See Ordering Information

Adjustability ±5% Zero & Span

Load Resistance 10kΩ max. (0-1mA models), 600Ω max. (0/4-20mA models)

Current Limit 1.4mA (0-1mA models), 30mA (0/4-20mA models),

Protection

Short to Ground Continuous

Transient ANSI/IEEE C37.90.1

Ripple and Noise <0.025% Span rms

(2) (3)

Accuracy

Sinusoid

50/60Hz ±0.25% Span

45Hz-1kHz ±0.25% Reading Additional Error

1kHz-20kHz ±0.75% Reading Additional Error

Non-Sinusoid

Crest Factor = 1 to 2 ±0.05% Reading Additional Error

Crest Factor = 2 to 3 ±0.15% Reading Additional Error

Crest Factor = 3 to 4 ±0.30% Reading Additional Error

Crest Factor = 4 to 5 ±0.40% Reading Additional Error

Vs. Temperature ±100ppm/°C

Isolation (Common Mode)

Input to Output, Input to Power

Continuous 1500Vrms max

Transient ANSI/IEEE C37.90.1

Output to Power

Continuous 50VDC max

Response Time (0 to 99%) <400ms

CMR (50 or 60Hz) 100dB

Power Supply

Voltage 19 to 29VDC

Current 60mA (V

Sensitivity ±0.0002%/%

Protection

Reverse Polarity Continuous

Transient ANSI/IEEE C37.90.1

Environmental

Operating Temp. Range -40°C to +80°C

ATEX Group II, Category 3 -20°C to +40°C

Storage Temp. Range -40°C to +80°C

Relative Humidity 0 to 95% noncondensing

Emissions EN61000-6-4 ISM, Group 1

Radiated, Conducted Class A

Immunity EN61000-6-2 ISM, Group 1

R F Performance A ±0.83% Span Error

ESD, EFT, Surge, Voltage Dips Performance B

Mechanical Dimensions (h)(w)(d) 2.95" x 0.89" x 4.13" (75mm x 22.5mm x 105mm)

Mounting DIN EN50022-35x7.5 or -35x15 rail

NOTES:

(1) For 1 to 25 seconds the max allowable transient current rating is √ 2500 / (event time). For less than 1 second, ANSI/IEEE C37.90.1 applies with a 0.05Ω load. For greater than 25 seconds, the 10A max continuous rating applies.

(2) For 10-100% rated span. Add 0.25% accuracy error (-02 thru -07), or 1.00% accuracy error (-01), for 0-10% Span measurements.

Accuracy includes nonlinearity, hysteresis and repeatability but not source or external shunt inaccuracy (if used).

(3) At standard 60Hz factory calibration. Consult factory for calibration at other frequencies.

Typical at TA=+25°C and +24V supply voltage

8mA (0-5/10V models)

DSCA33

), 80mA (I

OUT

)

Ordering Information

Model Input (rms)Output (dc)

DSCA33-01 0-100mV 2, 3, 4, 5, 6

DSCA33-02 0-1V 2, 3, 4, 5, 6

DSCA33-03 0-10V 2, 3, 4, 5, 6

DSCA33-04 0-150V 2, 3, 4, 5, 6

DSCA33-05 0-300V 2, 3, 4, 5, 6

DSCA33-06 0-1A 2, 3, 4, 5, 6

DSCA33-07 0-5A 2, 3, 4, 5, 6



Modules can be ordered with other input/output ranges. Consult

factory for ordering details and specifications

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



Output Ranges Available

Output Range Part No. Suffix Example

2. 0V to +10V NONE DSCA33-01

3. 4 to 20mA C DSCA33-01C

4. 0 to 20mA E DSCA33-01E

5. 0V to +5V A DSCA33-01A

6. 0 to 1mA B DSCA33-01B

Installation Notes:

1.) This Equipment is Suitable for Use in Class I, Division 2, Groups A, B,

C, D, or Non-Hazardous Locations Only.

2.) Warning - Explosion Hazard - Substitution of Components May Impair

Suitability for Class I, Division 2.

3.) Warning - Explosion Hazard - Do Not Disconnect Equipment Unless

Power Has Been Switched Off or The Area is Known to be Non-Hazardous.

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DSCA

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