71m6515h Maxim Integrated Products, Inc., 71m6515h Datasheet - Page 49

• Manufacturer Part Number: 71m6515h
• Description: 71m6515h Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

Meter Circuits
Bits 7 through 5 (EQU) of the CONFIG register allow the selection of the metering equation that is to be implemented by the
71M6515H. The equation to be used depends on the meter configuration.
Figure 16 shows how the 71M6515H is connected for the most common configuration, the three-phase, four-wire WYE. The
neutral wire connects to V3P3A. For this configuration, equation 5 must be selected.
In many three-phase three-wire configurations, one phase can be grounded, as shown in Figure 17. Again, the grounded wire
is connected to V3P3A. For this configuration, equation 2 must be selected.
The four-wire three-phase delta configuration is shown in Figure 20. In this case, the center tap of the transformer that
provides the A-C voltage is grounded. the grounded wire is connected to V3P3A. For this configuration, equation 2 must be
selected. For this configuration, equation 3 must be selected, i.e. P = VA*(IA-IB)/2 + VC*IC.
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transformers
Distribution
Figure 16: 4-Wire 3-Phase WYE Connection
© 2005-2008 TERIDIAN Semiconductor Corporation
B
N
A
C
APPLICATION INFORMATION
P=VA*IA+VB*IB+VC*IC
ANSI: Form 16S
CT
EQU = 5
CT
CT
V3P3A
IA
IB
IC
V A
VB
VC
71M6515H
Energy Meter IC
LOAD B
LOAD C
LOAD A
DATA SHEET
71M6515H
MARCH 2008
V1.4