ADE9430 datasheet(26/35 Pages) AD

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Data Sheet

ADE9430

THEORY OF OPERATION

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Rev. 0 | 26 of 35

AFWATT, BFWATT, and CFWATT registers. With full-scale inputs,

the xWATT and xFWATT value are 20,694,066 decimals.

Enable the LPF2 (DISAPLPF = 0) for normal operation. Disable

LFP2 by setting DISAPLPF in the CONFIG0 register to obtain

instantaneous total active power. DISAPLPF is zero at reset.

The total and fundamental measurements can be calibrated for gain

and offset. The following equations indicate how the gain and offset

calibration registers modify the results in the corresponding power

registers:

xWATT= 1+xPGAIN227 xWATT0+xWATTOS (6)

xFWATT= 1+xPGAIN227 xFWATT0

+xFWATTOS

(7)

xPGAIN is a common gain to total and fundamental components of

active, reactive, and apparent powers.

See the ADE9430 Technical Reference Manual for additional infor-

mation.

Total and Fundamental Reactive Power

The ADE9430 offers the total and fundamental reactive power

measurements on all channels. Figure 45 shows how to perform

the total reactive power calculation.

Figure 45. Total Reactive Power, AVAR, Calculation

The reactive power calculations, one for each channel AVAR,

BVAR, and CVAR, are updated every 8 kSPS. The fundamental

reactive power is also updated every 8 kSPS and is available in the

AFVAR, BFVAR, and CFVAR registers. With full-scale inputs, the

xVAR and xFVAR value are 20,694,066.

Enable the LPF2 (DISRPLPF = 0) for normal operation. Disable

LFP2 by setting DISRPLPF in the CONFIG0 register to obtain

instantaneous total reactive power. DISRPLPF is 0 at reset.

The following equations indicate how the gain and offset calibration

registers modify the result in the corresponding power registers:

xVAR= 1+xPGAIN227 xVAR0+xVAROS (8)

xFVAR= 1+xPGAIN227 xFVAR0+xFVAROS (9)

See the ADE9430 Technical Reference Manual for additional infor-

mation.

Total and Fundamental Apparent Power

The ADE9430 offers the total and fundamental apparent power

measurements on all channels. See Figure 46 for how to calculate

the total apparent power for Phase A.

Figure 46. Total Apparent Power, AVA, Calculation for Phase A

The total apparent power calculations, one for each channel AVA,

BVA, and CVA, are updated every 8 kSPS. The fundamental appa-

rent power is also updated every 8 kSPS and is available in the

AFVA, BFVA, and CFVA registers. With full-scale inputs, the xVA

and xFVA value are 20,694,066 decimals.

The ADE9430 offers a register (VNOM) that can be set to a value to

correspond to the desired voltage rms value. If the VNOMx_EN bits

in the CONFIG0 register are set, VNOM multiplies by xIRMS when

calculating xVA.

See the ADE9430 Technical Reference Manual for additional infor-

mation.

No Load Detection, Energy Accumulation, and

Power Accumulation Features

The ADE9430 calculates the total and fundamental values of ac-

tive, reactive, and apparent energy for all the three phases. The

ADE9430 can have signed, absolute, positive, or negative only

accumulation on active and reactive energies using the WATTACC

and VARACC bits in the ACCMODE register. The default accumu-

lation mode is signed. See the ADE9430 Technical Reference

Manual for additional information.

No Load Detection Feature

The ADE9430 has a no load detection for each phase and energy

to prevent energy accumulation due to noise. If the accumulated

energy over the user defined time period is below the user defined

threshold, zero energy is accumulated into the energy register.

The NOLOAD_TMR bits in the EP_CFG register determine the

no load time period and the ACT_NL_LVL, REACT_NL_LVL, and

APP_NL_LVL registers contain the user defined no load threshold.

The no load status is available in the PHNOLOAD register, the

IRQ1 interrupt, and the EVENT pin.

See the ADE9430 Technical Reference Manual for additional infor-

mation.

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