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Wiring the Power supply to the unit into input number, one, via the "HI Z" terminals provides the benefit of measureing resistance to earth of this circuit, as well as the nominal voltage of the main supply circuit, which is likely the B12 circuit.
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- At present the SA380-IT can not independently measure faults to earth of the two connected DC circuit circuits. A future firmware update will allow this to be achievedAt present, the SA380-IT measures the degree of isolation between circuit circuits as a standing voltage between the two circuits being measured. A table (at the end of this document) must be utilised to determine the possible level of insulation resistance.
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Detectable Faults
A standing voltage on the SA380-IT inputs will be observed if any of the four fault conditions shown below are true.
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