3.1.25 Voltage Interrupt Thresholds
For each cycle of the dominant phase, the RMS values of all voltages are calculated, taking into account just the fundamental component. Each calculated value is then compared to the corresponding INTERRUPT_THRESHOLD_Vx, (where x = [A, B, C]), to assess whether a phase-loss condition is present.
The associated flag, PH_x_ACTIVE, is cleared every cycle in which a phase loss exists. In the same way, PH_x_ACTIVE is set every cycle in which a phase loss is not detected.
A threshold is allowed for each phase after meter form transformation.
The INTERRUPT_THRESHOLD_Vx is stored in the uQ0.32 format, thus, set the threshold value as follows:
| Name: | INTERRUPT_THRESHOLD_Vx (x = A, B, C) |
| Property: | Read-Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| INTERRUPT_THRESHOLD_Vx[31:24] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| INTERRUPT_THRESHOLD_Vx[23:16] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| INTERRUPT_THRESHOLD_Vx[15:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| INTERRUPT_THRESHOLD_Vx[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |