71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
AUGUST 2007
Current Shunt Variables
Input variables: IA_SHUNT and IB_SHUNT can configure the current inputs to accept shunt resistor sensors. In this case the
CE provides an additional gain of 8 to the current inputs. This will enable the pulse rate to change by 8 times. In order to
maintain a normal pulse rate WRATE may have to be decreased by 8 times. Whenever IA_SHUNT or IB_SHUNT are set to 1
or a positive number, In_8 is assigned a value of 8 in the equation for Kh.
CE
Name
Default
Description
Address
When +1, these variables increase the respective current gain by 8. The
gain factor controlled by In_SHUNT is referred to as In_8 throughout this
document. Allowed values are 1 or –1. For example, if IB_SHUNT=-1, IB_8
= 1, if IB_SHUNT = 1, IB_8 = 8.
2A
IA_SHUNT
-1
2B
2C
IB_SHUNT
-1
IA_SHUNT corresponds to IA_8, IB_SHUNT corresponds to IB_8.
RESERVED
CE Calibration Parameters
The table below lists the parameters that are typically entered to affect calibration of meter accuracy.
CE
Name
Default
Description
Address
8
9
A
B
C
D
CAL_IA
CAL_VA
CAL_IB
RESERVED
RESERVED
RESERVED
16384
16384
16384
These constants control the gain of their respective channels. The nominal
value for each parameters 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 scaled by 1/(1 – 0.01).
These two constants control the CT phase compensation. No compensation
occurs when PHADJ_X = 0. As PHADJ_X is increased, more compensation
(lag) is introduced. Range: ±215 – 1. If it is desired to delay the current by the
angle Φ:
E
F
PHADJ_A
PHADJ_B
0
0
a ⋅TANΦ
PHADJ _ X = 220
F0
FS
F0T =
b − c ⋅TANΦ
−9
−9
a =1+ (1− 2 )2 − 2(1− 2 )cos(2πF0T)
−9
10
RESERVED
0
b = (1− 2 )sin(2πF0T)
−9
c =1− (1− 2 )cos(2πF0T)
Page: 72 of 95
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