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71M6545/71M6545H Data Sheet
5.4.10 CE Calibration Parameters
Table 77 lists the parameters that are typically entered to effect calibration of meter accuracy.
Table 77: CE Calibration Parameters
at 60Hz
PHADJ _ X = 2 20
CE
Address
0x10
0x11
0x13
0x14
0x16
0x17
0x19
0x12
0x15
Name
CAL_IA
CAL_VA
CAL_IB
CAL_VB
CAL_IC
CAL_VC
CAL_ID
PHADJ_A
PHADJ_B
Defau
lt
16384
16384
16384
16384
16384
16384
16384
0
0
Description
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%.
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:
0 . 029615 TAN Φ
0 . 1714 ? 0 . 0168 ? TAN Φ
0x18
PHADJ_C
0
PHADJ _ X = 2 20
0 . 0206 ? TAN Φ
0 . 1430 ? 0 . 01226 ? TAN Φ
at 50Hz
The shunt delay compensation is obtained using the equation
provided below:
a 2 cos 2 ? ?
? ? + 2 ab cos ? ?
c sin ? ?
? ?
? ? + b
0x12
DLYADJ_A
0
DLYADJ _ X = ? deg rees ( 1 + 0 . 1 ? deg rees ) 2 14
2 π
360
? 2 π f ? ? 2 π f
? 2 π f ?
? f s ?
? f s ? ? f s
?
?
where:
a = 2 A
0x15
DLYADJ_B
0
b = A 2 + 1
c = 2 A 2 + 4 A cos ? ?
? + 2
? f s ?
? 2 π f ?
?
The table below provides the value of A for each channel:
Channel
Value of A
(decimal)
0x18
DLYADJ_C
0
DLYADJ_A
DLYADJ_B
13840
11693
DLYADJ_C
9359
f is the mains frequency.
f s is the sampling frequency.
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 27 and Figure 28 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.
110
v2
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