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Detectable Faults
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Low Nominal Circuit Voltage
Monitoring the circuit voltage allows abnormally high, or abnormally low battery voltage to be detected. This is well documented in the existing user-guide.
- Detect failing battery cells or chargers
- Warning that inter-circuit isolation may be lower than suspected in the event of a low nominal voltage
Isolation from Earth
The SA380-IT is primarily designed to ensure supply circuit that are earth-free by design remain so, Connecting both B12 and XB12 in the normal arrangement ensures that this is true.
This is well documented in the existing user-guide.
Inter-Circuit Isolation
Device misoperation is also possible due to cross-coupling of circuits that are not via an earth connection.
By wiring SA380-IT inputs "cross-pole" between two circuits, a standing voltage on the SA380-IT inputs will be observed if any of the four fault conditions shown below are true.
The wiring diagram above shows this "cross-pole" arrangement on inputs 2 and 3.
Fault 1 and Fault 2 cause a voltage to present across both of the SA380-IT inputs. In this scenario the voltage may be as high as the nominal circuit voltage.
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Alternatively Inputs 4 and 5 can be wired directly across the terminal of each circuit to provide remote cell voltage monitoring. A wiring diagram showing such a solution is shown belowView file
Configuration
Fault Resistance Table
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