Two-wire resistance terminated ground check
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United States of America Patent
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Jun 5, 2018
Issued Date -
Aug 25, 2016
app pub date -
Feb 19, 2016
filing date -
Feb 19, 2015
priority date (Note) -
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Abstract
A ground check monitoring device coupled to a trailing cable includes a voltage source and a switch. The trailing cable includes a first conductor, a second conductor, and a ground conductor. A resistive termination device is coupled between the first conductor and the ground conductor. A controller of the ground check monitoring device can toggle the switch between a first node of the first conductor and a second node of the second conductor. By measuring voltages at the first and second nodes, the ground check monitoring device can determine if the resistive termination device is shorted. Further, the controller can calculate resistance values of the first and second conductors and calculate a resistance value of the ground conductor. The calculated resistance values can be compared to expected values and the controller can signal a ground fault condition as appropriate based on the comparisons.
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