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ADE7878ACPZ Datasheet(PDF) 58 Page - Analog Devices |
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ADE7878ACPZ Datasheet(HTML) 58 Page - Analog Devices |
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58 / 92 page  ADE7878 Rev. 0 | Page 58 of 92 When WATTACC[1:0] = 11, the active powers are accumulated in absolute mode. When the powers are negative, they change sign and accumulate together with the positive power. Figure 73 shows how absolute active power accumulation works. Note that in this mode, the xWATTHR registers continue to accumulate active powers in signed mode, even if the CFx pulses are generated based on the absolute accumulation mode. Bits[3:2] (VARACC[1:0]) in the ACCMODE[7:0] register deter- mine the accumulation modes of the total and fundamental reactive powers when signals proportional to the reactive powers are chosen at the CFx pins (Bit CFxSEL[2:0] in the CFMODE[15:0] register equals 001 or 100). When VARACC[1:0] = 00, the default value, the reactive powers are sign accumulated before entering the energy-to-frequency converter. Figure 74 shows how signed reactive power accumulation works. Note that in this mode, the CFx pulses are synchronized perfectly with the reactive energy accumulated in the xVARHR registers because the powers are sign accumulated in both datapaths. NEG POS POS APNOLOAD SIGN = POSITIVE NEG NO-LOAD THRESHOLD ACTIVE POWER NO-LOAD THRESHOLD ACTIVE ENERGY REVAPx BIT IN STATUS0 xWSIGN BIT IN PHSIGN Figure 73. Active Power Absolute Accumulation Mode NEG POS POS VARNOLOAD SIGN = POSITIVE NEG NO-LOAD THRESHOLD REACTIVE POWER NO-LOAD THRESHOLD REACTIVE ENERGY REVRPx BIT IN STATUS0 xVARSIGN BIT IN PHSIGN Figure 74. Reactive Power Signed Accumulation Mode When VARACC[1:0] = 10, the reactive powers are accumulated depending on the sign of the corresponding active power. If the active power is positive, the reactive power is accumulated as is. If the active power is negative, the sign of the reactive power is changed for accumulation. Figure 75 shows how the sign adjusted reactive power accumulation mode works. Note that in this mode, the xVARHR registers continue to accumulate reactive powers in signed mode, even if the CFx pulses are generated based on the sign adjusted accumulation mode. POS POS VARNOLOAD SIGN = POSITIVE NEG NO-LOAD THRESHOLD NO-LOAD THRESHOLD NO-LOAD THRESHOLD REACTIVE POWER ACTIVE POWER REACTIVE ENERGY REVRPx BIT IN STATUS0 xVARSIGN BIT IN PHSIGN Figure 75. Reactive Power Accumulation in Sign Adjusted Mode |
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