Using Visual Indicators (LEDs) in ITAs

Knowledge Base Article # Q200309

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Summary Guidelines for using ITA Visual indicators (for internal MTS use)
  • MTS has developed a CCA that serves as a general purpose indicator board.
  • Attached are the schematics 3999-402-00-Aa-SCH.PDF and the assembly drawings 3999-402-00_Assembly Drawings.pdf. The mechanical engineers have a template of the board so they can design an ITA front panel after you tell them which indicator the design uses of the available ones.
  • There are 4 AC indicators (LD7 – LD10), supporting ITAs that use a three phase input (Neutral is common for them) and / or a single phase. Those inputs are rectified and designed to be ON for inputs of about 115VAC (most probably will be ON for a much lower voltage too).
  • There are 2 DC indicators for the 5-40V range (LD1 - LD2). When the associated jumper connects positions 1 and 2 the range is 5-20V, when connecting 2-3 the range is 6-40V.
  • There are 4 DC indicators for the 6-80V range (LD3 – LD6). When the associated jumper connects positions 1 and 2 the range is 8-80V, when connecting 2-3 the range is 6-40V.
  • Keep in mind that the DC inputs have an input capacitor and the AC inputs have a 270K input resistor. This means that Safe To Turn On or Isolation tests may be impacted.

Article Date 11/13/2017 4:11:12 PM
Keywords ITA LED Indicator

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