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DSCA45

Frequency Input Signal Conditioners

Each DSCA45 frequency input module provides a single channel of frequency input which is isolated and converted to a standard analog voltage or current output.

The frequency input signal can be a TTL level or zero-crossing signal. Terminal 7 (-IN) on the field-side terminal block is the “common” or ground connection for input signals. A TTL signal is connected from terminal 6 (+IN) to terminal 7 (-IN), while a zero-crossing signal is connected from terminal 5 (+EXC) to terminal 7 (-IN). Input circuitry for each of the signal types has hysteresis built in. An input signal must cross entirely through the hysteresis region in order to trigger the threshold comparator.

A +5.1 V excitation is available for use with magnetic pick-up or contact-closure type sensors. The excitation is available on terminal 8 (-EXC) with return at terminal 7 (-IN).

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 240 VAC 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.

DSCA45 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.

Circuit diagram Dataforth DSCA45

Block Diagram DSCA45



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8 Modules for Type DSCA45:

ModuleInputDescription
DSCA45-01 0 Hz to 500 Hz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-02 0 Hz to 1 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-03 0 Hz to 2.5 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-04 0 Hz to 5 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-05 0 Hz to 10 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-06 0 Hz to 25 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-07 0 Hz to 50 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output
DSCA45-08 0 Hz to 100 kHz DSCA45 Isolated Frequency Input Signal Conditioner with Voltage- or Current-Output

Specifications

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  • Input: Frequency up to 100 kHz
  • Output: 0V…10V / 0mA…20mA / 4mA…20mA
  • TTL Pegel and Zero Crossing
  • Isolation 1500 Vrms
  • Input protection 240 Vrms
  • Input Resistance 100 kOhm
  • Accuracy ± 0.05%
  • Linearity ± 0.02%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 120dB
  • True 3-way isolation
  • Response Time 1.5 ms to 310 ms
  • Power Supply 19 to 29 VDC
  • Operating Temperature Range -40°C … +80°C
  • Adjustability of +/-5 % Zero and span
  • 5-pol. Filtering
  • Dimensions 75 x 22.5 x 105 mm
  • DIN Rail Mounting
  • CE and ATEX certified, C-UL-US compliant
  • Special Solutions on request