How may we reliably detect the Power Factor PHASE in a Delta System?
ALL Voltages, Currents, Delta VA, Delta Watts, Delta VAR, and Delta PF all measure Perfectly.
The sign of the PF is continuing to be unreliable – we have tried many methods.
The system has a minimum of 500 Watts of real power.
The system is connected per figure 13.4 of AN-639.
CONSEL = 0b01
A_watts is read from 0xE513
C_Watts is read from 0xE515
Delta_Watts = A_Watts + C_Watts
A_VA is read from 0xE519
C_VA is read from 0xE51B
Delta_VA = A_VA + C_VA
Delta_VAR = sqrt(Delta_Watts^2 - Delta_VA^2)
PF = 100(Delta_Watts/Delta_VA)
We have tried using the sign of FWATTS.
We have tried using SUM1SIGN bit 3 from PHSIGN 0xE617.
We have tried using SUM2SIGN bit 7 from PHSIGN 0xE617.
We have tried using SUM3SIGN bit 8 from PHSIGN 0xE617.
We have tried using the sign of Delta_Watts.
We have had marginal success with the first 4 but do NOT obtain reliable results.
Please tell me the correct method for determining the phase of PF.
Thanks, Glenn Wilson Wilson@stny.rr.com