socomec CCS WattNode BACnet WNC-3Y-208-BN User manual

www.ctlsys.com
WattNode ®BaCNet ®
Electric Power Meter - Installation Manual
WattNode BACnet
Models WattNode Revenue for BACnet Models
WNC-3Y-208-BN RWNC-3Y-208-BN
WNC-3Y-400-BN RWNC-3Y-400-BN
WNC-3Y-480-BN RWNC-3Y-480-BN
WNC-3Y-600-BN RWNC-3Y-600-BN
WNC-3D-240-BN RWNC-3D-240-BN
WNC-3D-400-BN RWNC-3D-400-BN
WNC-3D-480-BN RWNC-3D-480-BN

2
Contents
1 Precautions ..............................................................................................................................3
1.9 Symbols .....................................................................................................................................3
2 Overview...................................................................................................................................3
2.1 Additional Literature...................................................................................................................3
2.2 Electrical Service Types............................................................................................................4
3 Installation................................................................................................................................7
3.1 Installation Checklist..................................................................................................................7
3.2 Mounting ....................................................................................................................................7
3.3 Connect Voltage Terminals........................................................................................................7
3.4 Connect Current Transformers..................................................................................................8
3.5 Connect the Output Signals.......................................................................................................9
3.6 Connect Thermistor.................................................................................................................10
4 Operation................................................................................................................................10
4.1 Initial Configuration..................................................................................................................10
4.2 Power Status LEDs..................................................................................................................10
4.3 Communication LED................................................................................................................12
4.4 Monitoring ................................................................................................................................12
4.5 Maintenance and Repair..........................................................................................................12
5 Specifications........................................................................................................................12
5.1 Accuracy ..................................................................................................................................12
5.2 Measurement...........................................................................................................................13
5.3 Electrical ..................................................................................................................................13
5.4 Thermistor Input.......................................................................................................................14
5.5 EIA RS-485 Interface ..............................................................................................................14
5.6 Certifications............................................................................................................................15
5.7 Environmental..........................................................................................................................15
5.8 Mechanical...............................................................................................................................15
5.9 FCC Information.......................................................................................................................15
5.10 Warranty...................................................................................................................................16
5.11 Limitation of Liability ................................................................................................................16

3
1 Precautions
1.1 Only qualified personnel or licensed electricians should install the WattNode meter. The
mains voltages of 120 to 600 Vac can be lethal!
1.2 Follow all applicable local and national electrical and safety codes.
1.3 The terminal block screws are not insulated. Do not contact metal tools to the screw terminals
if the circuit is live!
1.4 Verify that circuit voltages and currents are within the proper range for the meter model.
1.5 Use only UL Listed or UL Recognized current transformers (CTs) with built-in burden resistors,
that generate 0.333 Vac (333 millivolts AC) at rated current. Do not use current output (ra-
tio) CTs such as 1 amp or 5 amp output CTs: they will destroy the meter and may create
a shock hazard.
1.6 Protect the line voltage conductors to the meter with fuses or circuit breakers (not needed for
the neutral or ground wires). See 3.3.1 below.
1.7 Equipment must be disconnected from the HAZARDOUS LIVE voltages before access.
1.8 If the meter is not installed correctly, the safety protections may be impaired.
1.9 Symbols
Read, understand, and follow all instructions including warnings and precautions
before installing and using the product.
Potential Shock Hazard from Dangerous High Voltage.
Functional ground; should be connected to earth ground if possible, but is not
required for safety grounding.
UL Listing mark for U.S.A. and Canada.
FCC Mark. This logo indicates compliance with part 15 of the FCC rules.
Complies with the regulations of the European Union for Product Safety and
Electro-Magnetic Compatibility.
• Low Voltage Directive – EN 61010-1:2010 (3rd Edition)
• EMC Directive – EN 61326-1:2013
V~This indicates an AC voltage.
2 Overview
Congratulations on your purchase of the WattNode®BACnet®or WattNode®Revenue for BACnet®
watt/watt-hour transducer (meter). It is designed for use in demand side management (DSM),
submetering, energy monitoring, billing and renewable energy applications. The WattNode meter
communicates on an EIA RS-485 two-wire bus using the BACnet protocol.
The WattNode Revenue (RWNC) version meets the ANSI C12.1 standard for revenue metering
when used with IEEE C57.13 class 0.6 current transformers, such as the Accu-CT®.
WattNode BACnet models are BTL (BACnet Testing Laboratories) certified for interoperability.
2.1 Additional Literature
See the Continental Control Systems, LLC website (www.ctlsys.com) for product pages,
datasheets, and support pages for all WattNode meter models and current transformers. Each
WattNode model has an Operating and Reference Guide with detailed information on the avail-
able measurements and interface.

4
Ground
WHITE
BLACK
ØB CT
ØC CT
ØA CT
ØB
ØC
N
ØA
Common
B+, D1, RxD+/TxD+
EIA-485
PC or BACnet Host
A−, D0, RxD−/TxD−
Continental Control Systems LLC
Status
Status
Status
X
C
B+
A-
MS/TP
Com
WNC-
WNC-
W ATTNODE
®
BACNET
-BN
-BN
Neutral
Phase A
Phase B
Phase C
LOAD
WHITE
BLACK
WHITE
BLACK
SOURCE
Source
Faces
Current
Transformers
3Y-xxx
3D-xxx
Figure 1: WattNode Wiring Diagram
2.2 Electrical Service Types
Electrical
Service (or Load) Types
Line-to-
Neutral
(Vac)
Line-to-
Line
(Vac)
Meter
Service
Type
Meter
Powered
by
1 Phase 2 Wire 120V with neutral 96 – 138 n.a. 3Y-208 Nand ØA
1 Phase 2 Wire 230V with neutral (non-N.A.) 184 – 264 n.a. 3Y-400 Nand ØA
1 Phase 2 Wire 277V with neutral 222 – 318 n.a. 3Y-480 Nand ØA
1 Phase 2 Wire 208V no neutral n.a. 166 – 276 3D-240 ØAand ØB
1 Phase 2 Wire 240V no neutral n.a. 166 – 276 3D-240 ØAand ØB
1 Phase 3 Wire 120V/240V with neutral 96 – 138 166 – 276 3Y-208 Nand ØA
3D-240 ØAand ØB
3 Phase 3 Wire Delta 208V no neutral n.a. 166 – 276 3D-240 ØAand ØB
3 Phase 3 Wire Delta 400V no neutral (non-
N.A.) n.a. 320 – 460 3D-400 ØAand ØB
3 Phase 3 Wire Delta 480V no neutral n.a. 384 – 552 3D-480 ØAand ØB
3 Phase 4 Wire Wye 120V/208V with neutral 96 – 138 166 – 276 3Y-208 Nand ØA
3D-240 ØAand ØB
3 Phase 4 Wire Delta 120/208/240V with
neutral 96 – 138 166 – 276 3D-240 ØAand ØB
3 Phase 4 Wire Wye 230V/400V with neutral
(non-N.A.) 184 – 264 320 – 460 3Y-400 Nand ØA
3D-400 ØAand ØB
3 Phase 4 Wire Wye 277V/480V with neutral 222 – 318 384 – 552 3Y-480 Nand ØA
3D-480 ØAand ØB
3 Phase 4 Wire Delta 240/415/480V with
neutral 222 – 318 384 – 552 3D-480 ØAand ØB
3 Phase 4 Wire Wye 347V/600V with neutral 278 – 399 480 – 690 3Y-600 Nand ØA
Table 1: WattNode Models

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Table 1 above lists the WattNode models and common circuit types. In the “Electrical Service
Types” column, when two voltages are listed with a slash between them, they indicate the line-to-
neutral / line-to-line voltages. The “Line-to-Neutral” and “Line-to-Line” columns show the operating
ranges for the WattNode meters. “non-N.A.” refers to non-North American electrical services.
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.
2.2.1 Single-Phase Two-Wire with Neutral
This is a common residential and branch circuit connection. You may monitor up to three single-
phase circuits with one meter by also using the ØBand ØCinputs.
ØBØC NØA
W ATT N ODE ®
ØB
CT ØA CT
ØC
CT
L1
Neutral
Earth
2.2.2 Single-Phase Two-Wire No Neutral
This circuit occurs in residential (commonly 120/240 Vac) and some commercial applications.
The meter is powered from the ØAand ØBterminals. We recommend connecting the Nterminal
to ground to provide a clean voltage reference for the measurement circuitry (no current will flow
through this terminal).
ØBØC NØA
W ATT N ODE ®
ØB
CT ØA CT
ØC
CT
L2
L1
Earth
2.2.3 Single-Phase Three-Wire with Neutral
This is a common North American residential service at 120/240 Vac.
ØBØC NØA
W ATT N ODE ®
ØB
CT ØA CT
ØC
CT
L2
L1
Neutral
Earth
2.2.4 Three-Phase Three-Wire Delta No Neutral
This is common in commercial and industrial settings. In some cases, the service may be four-wire
wye while the load is three wire (no neutral).
Occasionally, a load will only be connected to two of the three lines (say L1 and L2). For this case,
connect the two active lines to the ØAand ØBterminals and connect two CTs for the two lines.

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ØBØC NØA
W ATT N ODE ®
ØB
CT ØA CT
ØC
CT
L3
L2
L1
Earth
2.2.5 Three-Phase Four-Wire Wye with Neutral
This is a common commercial and industrial service.
ØBØC NØA
W ATT N ODE ®
ØB
CT ØA CT
ØC
CT
L3
L2
L1
Neutral
Earth
2.2.6 Three-Phase Four-Wire Delta with Neutral (Wild Leg)
The uncommon four-wire delta electrical service is a three-phase delta service with a center-tap
on one of the transformer windings to create a neutral for single-phase loads.
The high-leg or phase with the higher voltage as measured to neutral has traditionally been des-
ignated “Phase B”. A change to the 2008 NEC now allows the high leg of a four-wire three-phase
delta service to be labeled as the “C” phase instead of the “B” phase. The WattNode meter will
work correctly with the high-leg connected to ØA, ØB, or ØC.
See the web article https://ctlsys.com/support/four_wire_delta_circuits/ for more information.
ØBØC NØA
W ATT N ODE ®
ØB
CT ØA CT
ØC
CT
L3
L2
L1
Neutral
Earth
2.2.7 Grounded Leg Service
In rare cases with delta services or single-phase two-wire services without neutral, one of the
phases may be grounded.
The WattNode meter will correctly measure services with a grounded leg, but the measured volt-
age and power for the grounded phase will be zero. The status LEDs will not light for the grounded
phase, because the voltage is near zero. This type of service may result in unusual power factors.
For more information, see https://ctlsys.com/support/corner-grounded_delta_circuits/.

7
3 Installation
3.1 Installation Checklist
See the sections referenced below for installation details.
□Turn off power before making line voltage connections.
□Mount the WattNode meter (see 3.2).
□Connect circuit breakers or fuses and disconnects (see 3.3.1).
□Connect the line voltage wires to the meter’s green terminal block (see 3.3.2).
□Mount the CTs around the line conductors. Make sure the CTs face the source (see 3.4).
□Connect the twisted white and black wires from the CTs to the black terminal block on the
meter, matching the wire colors to the white and black dots on the meter label (see 3.4.1).
□Check that the CT phases match the line voltage phases (see 3.4).
□Record the CT rated current for each meter, because it will be required during commission-
ing.
□Connect the output terminals of the WattNode meter to the monitoring equipment (see 3.5).
□Check that all the wires are securely installed in the terminal blocks by tugging on each wire.
□Turn on power to the meter.
□Verify that the LEDs indicate correct operation (see 4.2, 4.3).
3.2 Mounting
●Protect the meter from temperatures below –40°C (–40°F) or above 75°C (167°F), excessive
moisture, dust, salt spray, or other contamination, using a NEMA rated enclosure if necessary.
The meter requires an environment no worse than pollution degree 2 (normally only non-con-
ductive pollution; occasionally, a temporary conductivity caused by condensation).
●The meter must be installed in an electrical service panel or an enclosure.
●Do not use the meter as a drilling guide; the drill chuck can damage the screw terminals and
metal shavings may fall into the connectors.
The meter has two mounting holes spaced 5.375 in. (137 mm) apart (center-to-center). These
mounting holes are normally obscured by the detachable screw terminals. Remove the screw
terminals to mark the hole positions and mount the meter.
Self-tapping #8 sheet metal screws are included. Don’t over-tighten the screws, as long-term
stress on the case can cause cracking.
3.3 Connect Voltage Terminals
3.3.1 Circuit Protection
The WattNode meter is considered “permanently connected equipment” and requires a disconnect
means (circuit breaker, switch, or disconnect) and overcurrent protection (fuse or circuit breaker).
The meter only draws 10-30 milliamps, so the rating of any disconnect switch, fuses, and/or circuit
breakers is determined by the wire gauge, the mains voltage, and the current interrupting rating
required.
●The disconnect or circuit breaker must be clearly marked, suitably located, and easily reached.
●Use circuit breakers or fuses rated for 20 amps or less.
●Use ganged circuit breakers when monitoring more than one line voltage.
●The circuit breakers or fuses must protect the mains terminals labeled ØA, ØB, and ØC. In the
rare cases where neutral has overcurrent protection, then the overcurrent protection device
must interrupt both neutral and the ungrounded conductors simultaneously.
●The circuit protection / disconnect system must meet IEC 60947-1 and IEC 60947-3, as well as
all national and local electrical codes.

8
3.3.2 Line Wiring
● Always turn off power before connecting the line voltage inputs to the meter.
● For the line voltage wires, CCS recommends 16 to 12 AWG stranded wire, type THHN, MTW,
or THWN, 600 V.
●Do not place more than one voltage wire in a screw terminal; use separate wire nuts or termi-
nal blocks if needed.
● Verify that the line voltages are in the range of the line-to-line Ø-Ø and line-to-neutral Ø-N
values printed in the white box on the front label.
The screw terminals handle wire up to 12 AWG. Connect each voltage line to the green terminal
block as shown in Figure 1 above. After the voltage lines have been connected, make sure both
terminal blocks are fully seated in the meter.
Connect each line voltage to the appropriate phase; also connect ground and neutral (if appli-
cable). The neutral connection “N“ is not required on delta models (3D-240, 3D-400, and 3D-480),
but we recommend connecting it to ground if neutral is not present.
When power is first applied, check that the LEDs behave normally. If you see LEDs flashing red-
green-red-green (see Figure 7), the line voltage is too high for this model, so disconnect the power
immediately!
3.3.3 Grounding
The WattNode uses a plastic enclosure, insulation, and internal isolation barriers instead of
protective earthing. The ground terminal on the green screw terminal block is a functional ground,
designed to improve the measurement accuracy and noise immunity. If necessary, this terminal
may be left disconnected on wye models (-3Y).
3.4 Connect Current Transformers
To meet the UL listing requirements, the WattNode Pulse meter may only be used with UL Listed
CTs with a 333 mVac output or the following UL Recognized current transformer models, which all
generate 333 millivolts AC at rated current. See the current transformer datasheets for CT ratings.
ACT-0750-xxx
CTL-1250-xxx
CTM-0360-xxx
CTS-0750-xxx
CTS-1250-xxx
CTS-2000-xxxx
CTB-WxL-xxxx
CTT-0300-xxx
CTT-0500-xxx
CTT-0750-xxx
CTT-1000-xxx
CTT-1250-xxx
CTRC-yyyyy-xxxx
●“xxx” indicates the full scale current rating.
●“WxL” indicates the opening width (W) and leg length (L) in inches.
●“dddd” indicates the opening diameter of the loop for flexible Rogowski CTs.
●“yyyyy” indicates the opening size in mils (thousandths of inches).
See the web article Selecting Current Transformers for information on selecting appropriate
current transformers (CTs).
●Do not use ratio or current output CTs such as 1 amp or 5 amp output models!
●See the CT datasheets for the maximum input current ratings.
●Be careful to match the CTs with the voltage phases. Make sure the ØA CT is measuring the
current on the same phase as the ØAvoltage input, and the same for phases B and C. Use the
supplied colored labels or colored tape to identify the CT leads.
●To minimize current measurement noise, avoid extending the CT wires, especially in noisy
environments. If it is necessary to extend the wires, use twisted pair wire 22 to 14 AWG, rated
for 300 V or 600 V (not less than the service voltage) and shielded if possible.
●Find the source arrow or label “THIS SIDE TOWARD SOURCE” on the CT and face/point
toward the source of current.
●OPTIONAL: if you see spurious readings on unused phases, jumper the unused CT inputs:
for each unused CT, connect a short wire from the terminal marked with a white dot to the
terminal marked with a black dot.

9
Install the CTs around the conductor to be measured and connect the CT leads to the meter. Al-
ways turn off power before disconnecting any live conductors.
Split-core CTs can be opened for installation around a conductor. A nylon cable tie may be se-
cured around the CT to prevent inadvertent opening. If using solid-core CTs, put the line conduc-
tors through the CTs as shown in Figure 1 above.
CTs are directional. If they are mounted backwards or with their white and black wires swapped the
measured power will be negative. The status LEDs indicate negative measured power by flashing
red.
When installing WattNode Revenue models, be sure to only use IEEE C57.13 class 0.6 current
transformers, such as the Accu-CT; other CTs are less accurate and may not provide revenue ac-
curacy. Contact sales for more information on appropriate CTs.
3.4.1 CT Wiring
The current transformers connect to the six position black screw terminal block. Connect the
white and black CT wires to the meter terminals marked ØA CT, ØB CT , and ØC CT (see Figure 1
above). Excess length may be trimmed from the wires if desired. Connect each CT with the white
wire aligned with the white dot on the label, and the black wire aligned with the black dot. Note
the order in which the phases are connected, as the line voltage phases must match the current
phases for accurate power measurement.
3.5 Connect the Output Signals
●The meter outputs are electrically isolated from dangerous voltages.
●If the output wiring is near line voltage wiring, use wires or cables with a 300 V or 600 V rating
(not less than the service voltage).
●If the output wiring is near bare conductors, it should be double insulated or jacketed.
●You may install two wires into each screw terminal by twisting the wires together, inserting
them into terminal, and securely tightening. Note: a loose wire can disable an entire network
section.
●Use shielded twisted-pair cable to prevent interference. If there is no common conductor, con-
nect the shield to the Cterminal.
3.5.1 BACnet MS/TP
The WattNode BACnet meter can be connected to BACnet monitoring equipment, gateways, and
other BACnet devices.
Use DIP switches 1-6 to select the BACnet MAC address (0 to 63).
DIP Switch 123456
Up (1) Value 124816 32
Address Examples
11, Up 0, Down 0, Down 0, Down 0, Down 0, Down
1+2+4 = 7 1, Up 1, Up 1, Up 0, Down 0, Down 0, Down
4+16 = 20 0, Down 0, Down 1, Up 0, Down 1, Up 0, Down
1+2+16+32 = 51 1, Up 1, Up 0, Down 0, Down 1, Up 1, Up
Select the baud rate by setting DIP switch positions 7 and 8 as shown below. The change will take
effect in approximately ten seconds.
Baud Rate DIP Switch 7 DIP Switch 8
9,600 (default) 0, Down 0, Down
19,200 1, Up 0, Down
38,400 0, Down 1, Up
76,800 1, Up 1, Up

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3.5.2 Connect RS-485
X
C
B+
A-
W
ATT
N
ODE
WATTNODE
A-B+C
RS-485
X
C
B+
A-
●RS-485 wiring can be complex when multiple devices are connected, when running wires for
long distances, and when using termination and biasing resistors. If you have any questions,
consult the Operating and Reference Guide.
●Be sure to connect the A-, B+, and C(common) terminals. The Xterminal is normally not used.
You may use the cable shield (if present) for the Cconnection.
●For long distances, use shielded twisted-pair cable to prevent interference. With shielded
cable, connect the shield to earth ground at one end.
●RS-485 wiring is daisy-chained between meters, with up to 64 devices per subnet.
3.6 Connect Thermistor
If you ordered your meter with Option TM1 for use with an external thermistor for temperature
monitoring, you may connect the thermistor as shown below. See 5.4 Thermistor Input for details
on the required thermistor. Thermistor leads are not polarized, so either lead by by connected to
either of the Cand Xscrew terminals.
X
C
B+
A-
W
ATT
N
ODE
Thermistor
4 Operation
4.1 Initial Configuration
Generally, the network integrator will remotely configure the WattNode meter and the variables.
For details on configuring the WattNode meter, see the appropriate Operating and Reference
Guide for your model.
The meter does not include a display or buttons, so it is not possible to configure or monitor the
meter directly, other than the basic LED diagnostics described below.
At a minimum, the CtAmps must be programmed with the rated amps of the attached current
transformers for correct measurements.
4.2 Power Status LEDs
The three status LEDs on the front of the meter can help indicate correct measurements and op-
eration. The “A”, “B”, and “C” on the diagrams indicate the three phases.
4.2.1 Normal Startup
The meter displays the following startup sequence whenever power is first applied.