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Fault 3 and Fault 4 cause a larger voltage to be presented to the SA380-IT than Fault 1 and Fault 2. All four faults can also present in any combination, however the voltages presented in the case of Fault 1 and Fault 2 represent a "worst case" Equation 1 should therefore be used for the selection of alert levels and used to inform intervention decisions. The value yielded by equation 1 should there be read as "Resistance greater than or equal to X" Equation 1 also assumes a nominal circuit voltage. A voltage of 11.4 volts has been used to produce the table below. If it is credible that the cell voltage could fall further, yet the circuit remains operable, then a different nominal voltage should be used to populate the table. |
Configuration
If the wiring diagram above has been followed, the SA380-IT inputs should be configured as per the table below:
| Input No. | Name | Voltage | Type |
|---|---|---|---|
| 1 | B12 | 12 | DC |
| 2 | ISO 1 | 24 | DC |
| 3 | ISO 2 | 24 | DC |
| 4 | XB12 | 12 | DC |
Fault Resistance Table
Use the look up table below to convert the voltage present on wither the "ISO 1" or "ISO 2" channels into a worst-case level of inter-circuit isolation.
The table is populated using Equation 1, using a nominal circuit voltage of 11.4 V
The resistance value stated is "worst-case" the true level of isolation resistance may be greater and will be dependant upon how the fault is manifest.
Measured Voltage (ISO 1 or ISO 2) | Insulation Resistance (>= k Ohm) |
|---|---|
| 0 | INF |
| 0.1 | 31866 |
| 0.2 | 15792 |
| 0.3 | 10434 |
| 0.4 | 7755 |
| 0.5 | 6148 |
| 0.6 | 5076 |
| 0.7 | 4311 |
| 0.8 | 3737 |
| 0.9 | 3290 |
| 1 | 2933 |
| 1.1 | 2641 |
| 1.2 | 2397 |
| 1.3 | 2191 |
| 1.4 | 2014 |
| 1.5 | 1861 |
| 1.6 | 1727 |
| 1.7 | 1609 |
| 1.8 | 1504 |
| 1.9 | 1410 |
| 2 | 1325 |
| 2.1 | 1249 |
| 2.2 | 1179 |
| 2.3 | 1116 |
| 2.4 | 1058 |
| 2.5 | 1004 |
| 2.6 | 954 |
| 2.7 | 909 |
| 2.8 | 866 |
| 2.9 | 827 |
| 3 | 790 |
| 3.1 | 755 |
| 3.2 | 723 |
| 3.3 | 692 |
| 3.4 | 664 |
| 3.5 | 637 |
| 3.6 | 611 |
| 3.7 | 587 |
| 3.8 | 564 |
| 3.9 | 542 |
| 4 | 522 |
| 4.1 | 502 |
| 4.2 | 483 |
| 4.3 | 466 |
| 4.4 | 449 |
| 4.5 | 432 |
| 4.6 | 417 |
| 4.7 | 402 |
| 4.8 | 388 |
| 4.9 | 374 |
| 5 | 361 |
| 5.1 | 348 |
| 5.2 | 336 |
| 5.3 | 325 |
| 5.4 | 313 |
| 5.5 | 303 |
| 5.6 | 292 |
| 5.7 | 282 |
| 5.8 | 272 |
| 5.9 | 263 |
| 6 | 254 |
| 6.1 | 245 |
| 6.2 | 237 |
| 6.3 | 228 |
| 6.4 | 220 |
| 6.5 | 213 |
| 6.6 | 205 |
| 6.7 | 198 |
| 6.8 | 191 |
| 6.9 | 184 |
| 7 | 177 |
| 7.1 | 171 |
| 7.2 | 165 |
| 7.3 | 158 |
| 7.4 | 152 |
| 7.5 | 147 |
| 7.6 | 141 |
| 7.7 | 136 |
| 7.8 | 130 |
| 7.9 | 125 |
| 8 | 120 |
| 8.1 | 115 |
| 8.2 | 110 |
| 8.3 | 105 |
| 8.4 | 101 |
| 8.5 | 96 |
| 8.6 | 92 |
| 8.7 | 88 |
| 8.8 | 83 |
| 8.9 | 79 |
| 9 | 75 |
| 9.1 | 71 |
| 9.2 | 67 |
| 9.3 | 64 |
| 9.4 | 60 |
| 9.5 | 56 |
| 9.6 | 53 |
| 9.7 | 49 |
| 9.8 | 46 |
| 9.9 | 43 |
| 10 | 39 |
| 10.1 | 36 |
| 10.2 | 33 |
| 10.3 | 30 |
| 10.4 | 27 |
| 10.5 | 24 |
| 10.6 | 21 |
| 10.7 | 18 |
| 10.8 | 16 |
| 10.9 | 13 |
| 11 | 10 |
| 11.1 | 8 |
| 11.2 | 5 |
| 11.3 | 2 |
| 11.4 | 0 |
| 11.5 | 0 |
| 11.6 | 0 |
| 11.7 | 0 |
| 11.8 | 0 |
| 11.9 | 0 |
| 12 | 0 |