Page 4 of 16 WND-WR-MB-Inst-1.03
Ground
W
H
IT
E
B
LAC
K
CT2
CT3
CT1
V
B
V
C
V
N
V
A
P
CT1
P
CT2
P
CT3
Common
B+, D1, RxD+/TxD+
EI
A-
48
5
Monitoring Device
A−, D0, RxD−/TxD−
Continental Control Systems LLC
Com
1
0
X
C
B+
A–
M
od
bu
s
WND
-
WR
-
MB
W
ATT
N
ODE
®
M
ODBUS
Neutral
L1
L2
L3
LO
AD
WHITE
BLACK
W
H
IT
E
B
LAC
K
LI
N
E
Source
Faces
Current
Transformers
Figure 1: Wiring Diagram
2.2 Electrical Service Types
The WND-WR-MB meter supports any electrical service from 100 to 600 Vac, line-to-neutral or line-
to-line, 50 to 60 Hz, single-phase, split-phase, or three-phase, wye or delta.
Connect the line voltages to the meter inputs as shown in the following figures for each service type.
See
Figure 1
above for an overview.
Internally, the WattNode meter acts as three separate single-phase meters, one tied to each CT
input. By default, CT1 is associated with V
AN
(or V
A
- V
N
), CT2 with V
BN
, and CT3 with V
CN
. This
default configuration may be changed using the
ConnectionType
register or the
MeterConfig
regis-
for details.
When describing service types, the number of wires only includes neutral and line conductors, not
the ground conductor.
2.2.1 Single-Phase, Two-Wire, Line-to-Neutral
This is a common residential and branch circuit connection. The CT should be placed around the
line conductor and connected to the
CT1
). The meter will be powered from the
V
N
and
V
A
terminals.
V
B
V
C
V
N
V
A
W
ATT
N
ODE
®
CT2 CT1
CT3
L1
Neutral
Earth
Figure 2: Single-Phase, Two-Wire, Line-to-Neutral
Up to three such circuits may be monitored with one meter using three CTs by connecting the
second and third circuit line voltages to the
V
B
and
V
C
terminals and the additional CTs to
CT2
and
CT3
. It is also possible to monitor up to three circuits on the same
voltage phase without connections to
V
B
and
V
C
; see the
