6
Overview
Current Transformers
The WattNode meter may use split-core (opening), solid-core (toroidal), and flexible Rogowski
current transformers (CTs), with a full-scale voltage output of 333.33 mVac and opening widths
ranging from 0.3 in (7.6 mm) up to 12 in (305 mm) or Rogowski lengths up to 48 in (1220 mm).
Split-core and Rogowski CTs are easier to install without disconnecting the circuit being mea-
sured. Solid-core CTs installation requires that you disconnect the circuit to install the CTs.
Additional Literature
These additional documents are available on the Continental Control Systems, LLC website or
BACnet.org website.
●
WattNode BACnet Object List (Excel format):
WNC-BACnet-Object-List
●
Continental Control Systems, LLC website
○
https://ctlsys.com/product/wattnode-bacnet/
- main page.
○
https://ctlsys.com/cat/wattnode-bacnet/
- support articles.
●
http://www.bacnet.org
○
BACnet Standard: ASHRAE/ANSI Standard 135-2010
Front Label
This section describes the connections, information, and symbols on the front label.
Continental Control Systems LLC
Watthour Meter
US LISTED 3KNN
USA
Ø
B CT
0.333V
~
Ø
C CT
0.333V
~
Ø
A CT
0.333V
~
Status
Status
Status
X
C
B+
A-
Com
1
0
Ø
B
Ø
C
N
Ø
A
Ø-Ø
240V
~
Ø-Ø
240V
~
240V CAT III
240V CAT III
Ø-
N 140V
~
Ø-
N 140V
~
120V
~
50
-
60Hz 4
VA
2012-01-03
SN 000003
1 2 3 4 5 6 7 8
O
N
BACnet
MS/TP
W
ATT
N
ODE
®
BAC
NET
WNC
-
3Y
-
208
-
BN
Q
S
N
O
P
L
M
K
U
V
W
F
G
H
J
A
B
D
E
C
Y Z
R
T
X
Figure 1: Front Label Diagram
A: WattNode model number.
The “
WNC
” indicates a third generation WattNode meter. The “
3
”
indicates a three-phase model. The “
Y
” or “
D
” indicates wye or delta models, although delta
models can measure wye circuits (the difference is in the power supply). The “
208
” (or other
value) indicates the nominal line-to-line voltage. Finally, the “
BN
” indicates BACnet output.
B: Functional ground.
This terminal should be connected to earth ground if possible. It is not
required for safety grounding, but ensures maximum meter accuracy.
