Datasheet

71M6543F/71M6543G Data Sheet
v2 127
5.3.10 CE Calibration Parameters
Table 85 lists the parameters that are typically entered to effect calibration of meter accuracy.
Table 85: CE Calibration Parameters
CE
Address
Name Default Description
0x10
CAL_IA
16384
These constants control the gain of their respective channels. The
nominal value for each parameter is 2
14
= 16384. The gain of each
channel is directly proportional to its CAL parameter. Thus, if the
gain of a channel is 1% low, CAL should be increased by 1%.
0x11
CAL_VA
16384
0x13
CAL_IB
16384
0x14
CAL_VB
16384
0x16
CAL_IC
16384
0x17
CAL_VC
16384
0x19
CAL_ID
16384
0x12
PHADJ_A
0
These constants control the CT phase compensation. No
compensation occurs when PHADJ_X = 0. As PHADJ_X is increased,
more compensation (lag) is introduced. The range is ± 2
15
– 1. If it
is desired to delay the current by the angle Φ, the equations are:
Φ⋅−
Φ
=
TAN
TAN
XPHADJ
0168.01714.0
029615.0
2_
20
at 60Hz
Φ⋅−
Φ⋅
=
TAN
TAN
XPHADJ
01226.01430.0
0206.0
2_
20
at 50Hz
0x15
PHADJ_B
0
0x18
PHADJ_C
0
0x12
DLYADJ_A
0
The shunt delay compensation is obtained using the equation
provided below:
( )








+








+








∆+∆=
s
ss
reesrees
f
f
c
b
f
f
ab
f
f
a
XDLYADJ
π
ππ
π
2
sin
2
cos2
2
cos
360
2
21.01_
22
14
degdeg
where:
Aa 2=
1
2
+= Ab
 = 2

+ 4
2


+ 2
f is the mains frequency
f
s
is the sampling frequency
The table below provides the value of A for each channel:
Channel
Value of A
(decimal)
D YADJ_A
13840
DLYADJ_B
11693
DLYADJ_C
9359
0x15
DLYADJ_B
0
0x18
DLYADJ_C
0
Note:
The current sensor inputs are not assigned to the A, B and C phases in a fixed manner. The
assignments of phases A, B and C depends on how the IADC0-1, IADC2-3, IADC4-5, IADC6-7 current
sensing inputs are connected in the meter design. The CE code must be aware of these connections.
See Figure 31 and Figure 32 for typical meter configurations. VADC8, VADC9 and VADC10 are
assigned to voltage phases VA, VB and VC in a fixed manner, respectively.
The CE addresses listed in this table are assigned to phases A, B and C as indicated by their names.