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The detailed set-up of the 4-20mA is described below

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Digital Volt-Free-Contact Interface

Where a fault repeater exists, up to 12 digital outputs may be provided to indicate which sub-feeder is experiencing the worst insulation resistance. These are wired as per standard digital inputs:

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Additional alarm state changes may also be observed, but not if no fault condition exists.

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Real Time Digital Screen:

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This screen is a poor indicator of connection status, as the state of the digital channels depends on the fault condition of the cables under test. Bender CONN DN should be clear.

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Real Time Analogue Screen:

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Info
titleTrouble Shooting

If no RS485 data is visible:

  • Be patient. isometers may take up to 2 minutes to complete a single measurement, therefore it may be up to two minutes before data is visible
  • Check the integrity of the wiring. It could be poorly terminated cable.
  • Check the polarity of the wiring. It is very easy to get the "A" and "B" the wrong way around
  • Check for data on the RS485 bus. Ideally use a serial port on a computer to check for traffic. The baud rate is 9,600 bps. You should a string of numbers being transmitted periodically
  • Check for data on the RS485 bus. Alternatively connect a volt-meter with a rapid response across the A and B links. a brief spike in voltage should be observed when data is present on the bus,  Bear in mind the low update rate, and that the RS485 message only lasts a few milliseconds.



4-20mA Setup

You will need to apply a polynomial mapping to translate the 4-20mA output from the Bender RK170 into a readable resistance.

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Acquiring and Transmitting Data

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To perform the steps described in this section requires the use of the web-based configuration tool.

The touchscreen interface is not sophisticated enough.

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