71M6533 Datasheet, PDF (104/132 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6533/G/H and 71M6534/H Data Sheet
FDS_6533_6534_004
5.3.11 Noise Suppression and Version Parameters
Table 65 shows the CE parameters used for suppression of noise due to scaling and truncation effects.
CE
Address
0x26
0x27
0x28
0x2A
0x2B
0x2C
0x2E
0x2F
0x30
0x35
0x36
0x37
Table 65: CE Parameters for Noise Suppression and Code Version
Name
Default Description
QUANTA
0
QUANTB
0
QUANTC
0
QUANT_VARA 0
QUANT_VARB 0
QUANT_VARC 0
QUANT_IA
0
QUANT_IB
0
QUANT_IC
0
0x63653333
0x61303463
0x00000000
These parameters are added in channel A to the Watt calculation
to compensate for input noise and truncation.
LSB = (VMAX*IMAX / In_8) *1.04173*10^-9 W
These parameters are added to the VAR calculation for element
A and B to compensate for input noise and truncation.
LSB = (VMAX*IMAX / In_8) * 1.04173*10^-9 W
These parameters are added to compensate for input noise and
truncation in their respective channels in the squaring calculations
for I² and V².
LSB=VMAX²*5.08656*10^-13 V² and
LSB= (IMAX²/In_8²)* 5.08656*10^-13 A²
Text strings holding the CE version information as supplied by
the CE data associated with the CE code. For example, the
words 0x63653333 and 0x61303463 form the text string
“ce33a04c”.
These locations are overwritten in operation.
5.3.12 CE Calibration Parameters
Table 66 lists the parameters that are typically entered to effect calibration of meter accuracy.
CE
Address
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x18
0x19
0x1A
Name
CAL_IA
CAL_VA
CAL_IB
CAL_VB
CAL_IC
CAL_VC
CAL_ID
PHADJ_A
PHADJ_B
PHADJ_C
Table 66: CE Calibration Parameters
Default
16384
16384
16384
16384
16384
16384
16384
0
0
0
Description
These constants control the gain of their respective channels. The
nominal value for each parameter is 2¹⁴ = 16384. The gain of each
channel is directly proportional to its CAL parameter. Thus, if the
gain of a channel is 1% slow, CAL should be increased by 1%.
CAL_ID is used to calibrate the neutral current input.
These constants control the CT phase compensation. No com-
pensation occurs when PHADJ_X = 0. As PHADJ_X is increased,
more compensation (lag) is introduced. The range is ± 2¹⁵ – 1. If it
is desired to delay the current by the angle Φ, the equations are:
PHADJ _ X = 2^{20 0.02229 ⋅TANΦ}
at 60Hz
0.1487 − 0.0131⋅TANΦ
PHADJ _ X = 2²⁰
0.0155 ⋅ TANΦ
at 50Hz
0.1241− 0.009695⋅TANΦ
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