Power factor register format
Power factor in IEC and lead/lag (IEEE) formats: Float32 and Int16U registers
The meter provides total power factor in IEC and lead/lag (IEEE) formats in both Float32 and Int16U data types. You can use these registers to bring power factor information into third-party software. These registers are interpreted using the standard IEC and IEEE sign conventions.
Four quadrant power factor information: floating point registers
The meter also provides PF information (including sign and quadrant) in single floating point registers for each of the PF values (for example, per-phase and total values for true and displacement PF, and associated minimums and maximums). The meter performs a simple algorithm to the PF value then stores it in the appropriate PF register.
The meter and software (such as
Power Monitoring
Expert
or
ION Setup
) interpret these PF registers for reporting or data entry fields
according to the following diagram:
The PF value is calculated from the PF register value using the following formulas:
| Quadrant | PF range | PF register range | PF formula |
|---|---|---|---|
|
Quadrant 1 |
0 to +1 |
0 to +1 |
PF value = PF register value |
|
Quadrant 2 |
-1 to 0 |
-2 to -1 |
PF value = (-2) - (PF register value) |
|
Quadrant 3 |
0 to -1 |
-1 to 0 |
PF value = PF register value |
|
Quadrant 4 |
+1 to 0 |
+1 to +2 |
PF value = (+2) - (PF register value) |
Go to www.se.com and search for your meter’s Modbus register list to download a copy.