Data Sheet 71M6531D/F-71M6532D/F
Table 55: CE Transfer Variables
CE Ad-
dress
0x85
Name
WSUM_X
Description
FDS 6531/6532 005
0x86
0x87
0x8A
W0SUM_X
W1SUM_X
VARSUM_X
0x8B
0x8C
VAR0SUM_X
VAR1SUM_X
For
EQU
= 2, this register holds the calculated sum of Wh samples
from each wattmeter element (In_8 is the gain of 1 or 8 configured by
IA_SHUNT
or
IB_SHUNT).
LSB = 6.6952*10
-13
VMAX IMAX /
In_8
Wh.
The sum of Wh samples from each wattmeter element (In_8 is the gain
of 1 or 8 configured by
IA_SHUNT
or
IB_SHUNT).
LSB = 6.6952*10
-13
VMAX IMAX /
In_8
Wh.
For
EQU
= 2, this register holds the calculated sum of VARh samples
from each element (In_8 is the gain of 1 or 8 configured by
IA_SHUNT
or
IB_SHUNT).
LSB = 6.6952*10
-13
VMAX IMAX /
In_8
VARh.
The sum of VARh samples from each element (In_8 is the gain 1 or 8
configured by
IA_SHUNT
or
IB_SHUNT).
LSB = 6.6952*10
-13
VMAX IMAX
/
In_8
VARh.
WxSUM_X
is the Wh value accumulated for element X in the last accumulation interval and can be com-
puted based on the specified LSB value.
For example, with VMAX = 600 V and IMAX = 208 A, the LSB for
WxSUM_X
is 0.08356 µWh.
Instantaneous Measurement Variables
contains various measurement results. The Frequency measurement is computed for the phase
selected with
FREQSELn
bits in the
CECONFIG
register.
IxSQSUM_X
and
VxSQSUM
are the squared current and voltage samples acquired during the last accumu-
lation interval. They can be used to calculate RMS voltages and currents.
INSQSUM_X
can be used for
computing the neutral current.
Table 56: CE Energy Measurement Variables
CE Ad-
dress
0x82
Name
FREQ_X
Fundamental frequency.
LSB
≡
0x8F
0x90
0x93
0x94
0x45
0x46
0x47
0x48
0x99
0x9A
I0SQSUM_X
I1SQSUM_X
V0SQSUM_X
V1SQSUM_X
WSUM_ACCUM
VSUM_ACCUM
SUM3_ACCUM
SUM4_ACCUM
I0SQRES_X
I1SQRES_X
Description
F
S
≈
0.587
⋅
10
−
6
Hz
32
2
The sum of squared current samples from each element.
LSB
I
= 6.6952*10
-13
IMAX
2
/
In_8
2
A
2
h
The sum of squared voltage samples from each element.
LSB
V
= 6.6952*10
-13
VMAX
2
V
2
h
These registers contain roll-over accumulators for WPULSE and
VPULSE respectively.
These registers contain roll-over accumulators for pulse outputs
XPULSE and YPULSE respectively.
These registers hold residual current measurements with double-
precision accuracy. The exact current is:
ISQn =
InSQSUM_X
+
InSQRES_X
90
© 2005-2009 TERIDIAN Semiconductor Corporation
v1.2
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
