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SCM5B33

True RMS Input Signal Conditioners

Each SCM5B33 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 a standard process voltage or current output.

The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to ± 50 V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin, to I/O Common, pin 19.

The field voltage or current input signal is processed through a pre-amplifier and RMS converter on the field side of the isolation barrier. The converted DC signal is then 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. Modules are powered from + 5 VDC, ± 5%.

For current output models, in addition to the 5 VDC module power, an external loop supply of 4.2 V to 26 V is required. The loop supply connection, with series load, is between Pin 20 (+) and Pin 19 (-).

Due to circuit limitations, SCM5B33-04x and -05x are not ATEX compliant.

Circuit diagram Dataforth SCM5B33

Block Diagram SCM5B33



PDF Downloads:


7 Modules for Type SCM5B33:

ModuleInputDescription
SCM5B33-01 0 to +100 mV SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output
SCM5B33-02 0 to +1 V SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output
SCM5B33-03 0 to +10 V SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output
SCM5B33-04 0 to +150 V SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output
SCM5B33-05 0 to +300 V SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output
SCM5B33-06 0 to 1 A SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output
SCM5B33-07 0 to 5 A SCM5B33 Isolated True RMS Input Module with Voltage- or Current-Output

Specifications

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  • Input: Voltage (0 - 300V) / Current (0-5A)
  • Output: 0-1 mA, 0-20 mA, 4-20 mA, 0-5 V or 0-10 V
  • Standard Frequency 45 Hz to 1 kHz, expanded to 20 kHz
  • Isolation 1500 Vrms
  • Input protection 350 Vrms or 10 Arms
  • Input Resistance up to 1 MOhm or 0.10 Ohm or 0,025 Ohm
  • Accuracy ± 0.25%
  • Input protection up to 480V (Peak AC & DC) or 10 Arms
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 100dB
  • True 3-way isolation
  • Response Time < 400 ms
  • Power Supply +5 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 58 x 57 x 15 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request