Three-phase Active
Energy Meter
BL0952A/BL6513
real power signal is carried out. Thus the stability of the output frequency is ensured.
ꢁ
Mode Selection of the Sum of the Three Active Energies
The BL0952A/BL6513/BL6511 can be set to execute the arithmetic sum of the three active
energies,
Wh
= WhφA +WhφB +WhφC
Or the sum of the absolute value of these energies,
Wh = WhφA + WhφB + WhφC
.
The selection between the two modes can be made by setting the ADDSEL pin. Logic high
and logic low applied on the ADDSEL pin correspond to the arithmetic sum and the sum of
absolute values, respectively.
ꢁ
Anti-Creep Threshold
In BL0952A/BL6513/BL6511, when the rms of current and the rms of voltage are 500mV,
the anti-creep threshold is set as the 0.0020 percent of full-scale power. There are anti-creep logics
in three phase circuits.
SCF S0 S1
Min Freq On F1/F2
For AC input[Hz]
9.76E-06
Min Freq On CF For
AC input[Hz]
1.56E-04
1
0
1
0
1
0
1
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1.56E-05
2.50E-03
1.95E-05
1.56E-04
3.13E-04
5.00E-03
3.13E-04
2.50E-03
6.25E-05
1.00E-02
7.81E-05
1.25E-03
1.25E-03
1.00E-02
OPERATION MODE
ꢁ
FORMULA of OPERATION
In the BL0952A/BL6513/BL6511, the output frequency or pulse rate is related to the input
voltage signals by the following equation:
13.25
×
AP × IA +UBP × IB +UCP × IC × F
1−5
Freq =
VR2EF
Freq = Output frequency on F1 and F2 (Hz)
UAP, UBP, UCP = Differential rms voltage signal on voltage channels (volts)
IA, IB, and IC = Differential rms voltage signal on current channels (volts)
Vref = The reference voltage (2.42 V ± 8%) (volts)
F1-5 = One of five possible frequencies selected by using the logic inputs SCF, S0, and S1.
ꢁ
Selecting the operation mode
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4/21/2009
Total 12 Pages
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