WattNode BACnet Manuale utente

WattNode®BaCNet ®

Electric Power Meter - Reference Manual

Rev 1.20

(M8)

WattNode BACnet

Models

WNC-3Y-208-BN

WNC-3Y-400-BN

WNC-3Y-480-BN

WNC-3Y-600-BN

WNC-3D-240-BN

WNC-3D-400-BN

WNC-3D-480-BN

WattNode Revenue

Models for BACnet

RWNC-3Y-208-BN

RWNC-3Y-400-BN

RWNC-3Y-480-BN

RWNC-3Y-600-BN

RWNC-3D-240-BN

RWNC-3D-400-BN

RWNC-3D-480-BN

Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, Woburn MA 01801 - TestEquipmentDepot.com

Information in this document is subject to change without notice.

WattNode is a registered trademark of Continental Control Systems, LLC.

BACnet is a registered trademark of American Society of Heating, Refrigerating and Air-

Conditioning Engineers (ASHRAE)

FCC Information

This equipment has been tested and complies with the limits for a Class B digital device, pursuant

to part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device

may not cause harmful interference, and (2) this device must accept any interference received,

including interference that may cause undesired operation.

The FCC limits are designed to provide reasonable protection against harmful interference in a

residential installation. This equipment generates, uses and can radiate radio frequency energy

and, if not installed and used in accordance with the instructions, may cause harmful interfer-

ence to radio communications. However, there is no guarantee that interference will not occur in

a particular installation. If this equipment does cause harmful interference to radio or television

reception, which can be determined by turning the equipment off and on, the user is encouraged

to try to correct the interference by one or more of the following measures:

●Reorient or relocate the receiving antenna.

●Increase the separation between the equipment and receiver.

●Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected.

●Consult the dealer or an experienced radio/TV technician to help.

Contents 3

Contents

WattNode BACnet

Models ........................................................................................................................................... 1

WattNode Revenue Models for BACnet........................................................................................ 1

Overview ................................................................................................................................5

Measurements................................................................................................................................. 5

Diagnostic LEDs .............................................................................................................................. 5

Options ........................................................................................................................................... 5

Current Transformers ....................................................................................................................... 6

Additional Literature......................................................................................................................... 6

Front Label ...................................................................................................................................... 6

Installation..............................................................................................................................8

Precautions ..................................................................................................................................... 8

Electrical Service Types.................................................................................................................... 9

Single-Phase Two-Wire with Neutral ........................................................................................ 10

Single-Phase Three-Wire (Mid-Point Neutral)............................................................................ 11

Single-Phase Two-Wire without Neutral.................................................................................... 12

Three-Phase Four-Wire Wye .................................................................................................... 13

Three-Phase Three-Wire Delta Without Neutral ........................................................................ 14

Three-Phase Four-Wire Delta (Wild Leg)................................................................................... 14

Grounded Leg Service............................................................................................................. 14

Mounting ....................................................................................................................................... 15

Selecting Current Transformers ...................................................................................................... 16

Connecting Current Transformers................................................................................................... 17

Circuit Protection ........................................................................................................................... 18

Connecting Voltage Terminals ........................................................................................................ 19

Connecting an External Thermistor ................................................................................................ 19

Setting the BACnet Address .......................................................................................................... 20

Baud Rate............................................................................................................................... 20

Connecting BACnet MS/TP Outputs .............................................................................................. 20

Planning the BACnet Network ................................................................................................. 20

Wiring ..................................................................................................................................... 21

Installation Checklist ...................................................................................................................... 22

Installation LED Diagnostics ........................................................................................................... 22

Measurement Troubleshooting ....................................................................................................... 25

BACnet Communication Diagnostics.............................................................................................. 27

Operating Instructions .........................................................................................................29

Quick Start .................................................................................................................................... 29

WattNode Basic Configuration ................................................................................................. 29

Verify Operation....................................................................................................................... 29

Measurement Overview ........................................................................................................... 29

BACnet Communication ................................................................................................................ 30

BACnet Self-Discovery................................................................................................................... 30

BACnet Object and Property Lists.................................................................................................. 30

BACnet Object and Property Addressing ................................................................................. 30

Floating Point and Integer Values ............................................................................................. 31

Device Object.......................................................................................................................... 31

Analog Input Objects - Measurements ..................................................................................... 32

Analog Value Objects - Configuration and Diagnostics ............................................................. 34

Binary Value Objects - Configuration........................................................................................ 36

Multi-State Value Objects - Configuration and Diagnostics ....................................................... 36

File Object - Firmware Upgrade ............................................................................................... 36

Measurement Objects.................................................................................................................... 37

Energy Objects........................................................................................................................ 37

Per-Phase Energy Objects....................................................................................................... 38

Positive Energy........................................................................................................................ 38

Negative Energy ...................................................................................................................... 38

Reactive Energy ...................................................................................................................... 38

Apparent Energy ..................................................................................................................... 38

Power Objects......................................................................................................................... 39

Reactive Power ....................................................................................................................... 39

Apparent Power ...................................................................................................................... 39

Voltage Objects ....................................................................................................................... 40

Frequency ............................................................................................................................... 40

Current.................................................................................................................................... 40

Power Factor........................................................................................................................... 40

Demand Objects ..................................................................................................................... 41

Thermistor Temperature Object................................................................................................ 42

Configuration and Diagnostic Objects ............................................................................................ 43

Demand Configuration............................................................................................................. 44

Thermistor Configuration ......................................................................................................... 45

Calibration Adjustment ............................................................................................................ 45

Zeroing Objects....................................................................................................................... 46

ErrorStatus Objects ....................................................................................................................... 47

Communication Errors ................................................................................................................... 49

Maintenance and Repair ................................................................................................................ 50

Specifications ......................................................................................................................51

Models .......................................................................................................................................... 51

Model Options......................................................................................................................... 51

Accuracy................................................................................................................................. 51

Measurement ................................................................................................................................ 52

BACnet Communication ................................................................................................................ 52

BACnet Protocol Implementation Conformance Statement (PICS) .................................................. 53

Electrical........................................................................................................................................ 54

Certifications.................................................................................................................................. 55

Thermistor Input Specifications ...................................................................................................... 56

Environmental................................................................................................................................ 56

Mechanical .................................................................................................................................... 56

Current Transformers ..................................................................................................................... 57

Warranty...............................................................................................................................57

Limitation of Liability....................................................................................................................... 57

Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, Woburn MA 01801 - TestEquipmentDepot.com

Overview 5

Overview

Congratulations on your purchase of the WattNode®BACnet®watt/watt-hour transducer (meter).

The WattNode meter offers precision energy and power measurements in a compact package.

It is designed for use in demand side management (DSM), sub-metering, and energy monitor-

ing applications. The WattNode meter communicates on an EIA RS-485 two-wire bus using the

BACnet protocol. Models are available for single-phase, three-phase wye, and three-phase delta

configurations for voltages from 120 Vac to 600 Vac at 50 and 60Hz.

The WattNode meter uses a half-duplex EIA RS-485 interface for communication. The standard

baud rates are 9,600, 19,200, 38,400, and 76,800 baud. The meter uses the industry standard

BACnet MS/TP communication protocol, allowing up to 64 devices per RS-485 subnet.

Option TM1 for the WattNode BACnet adds support for temperature measurement using an

external 10k thermistor. This allows the WattNode to measure an external temperature (ambient, a

motor, chilled water, etc.) ranging from -50°C to 150°C (depending on the thermistor).

Measurements

The WattNode BACnet meter measures the following:

●True RMS Power - Watts (Phase A, Phase B, Phase C, Sum)

●Reactive Power - VARs (Phase A, Phase B, Phase C, Sum)

●Power Factor (Phase A, Phase B, Phase C, Average)

●True RMS Energy - Watthours (Phase A, Phase B, Phase C, Sum)

●Reactive Energy - VAR-hours (Sum)

●AC Frequency

●RMS Voltage (Phase A, Phase B, Phase C)

●RMS Current (Phase A, Phase B, Phase C)

●Demand and Peak Demand

One WattNode BACnet meter can measure up to three different “single-phase two-wire with neu-

tral” branch circuits from the same service by separately monitoring the phase A, B, and C values.

If necessary, you can use different CTs on the different circuits.

Diagnostic LEDs

The meter includes three power diagnostic LEDs—one per phase. During normal operation, these

LEDs flash on and off, with the speed of flashing roughly proportional to the power on each phase.

The LEDs flash green for positive power and red for negative power. Other conditions are signaled

with different LED patterns. See Installation LED Diagnostics (p. 22)for details.

The BACnet WattNode meter includes a communication LED that lights green, yellow, or red to

diagnose the RS-485 network. See BACnet Communication Diagnostics (p. 27)for details.

Options

The WattNode BACnet meter can be ordered with options. For more details and documentation,

see https://ctlsys.com/product/wattnode-bacnet/ on our website.

●Option CT=xxx - Pre-assign xxx as the CtAmpsA, B, and C values.

●Option CT=xxx/yyy/zzz - Pre-assign xxx to CtAmpsA, yyy to CtAmpsB, and zzz to

CtAmpsC.

●Option TM1 - Configure the meter for use with a 10k thermistor between the Cand Xtermi-

nals. This will use firmware version 1.20, which is not BTL certified. See also Connecting an

External Thermistor (p. 19)and Thermistor Temperature Object (p. 42).

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

ØB CT

0.333V~

ØC CT

0.333V~

ØA CT

0.333V~Status

Status

B+

A-

Com

ØB

ØC

ØA

Ø-Ø 240V~Ø-Ø 240V~

240V CAT III240V CAT III

Ø-N 140V~Ø-N 140V~

120V~50-60Hz 4VA

2012-01-03SN 000003

1 2 3 4 5 6 7 8

BACnet

MS/TP

WATTNODE

BACNET

WNC-3Y-208-BN

UV W

FGHJ

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.

Overview 7

C: Neutral. This terminal “N” should be connected to neutral for circuits where neutral is present.

D: Line voltage inputs. These terminals connect to the ØA(phase A), ØB(phase B), and ØC

(phase C) electric mains. On wye models the meter is powered from the ØAand Nterminals. On

delta models, the meter is powered from the ØAand ØBterminals.

E: Line voltage measurement ratings. This block lists the nominal line-to-neutral “Ø-N 120V~”

voltage, line-to-line “Ø-Ø 240V~” voltage, and the rated measurement voltage and category

“240V CAT III” for this WattNode model. See the Specifications (p. 51)for more information

about the measurement voltage and category.

F: UL Listing mark. This shows the UL and cUL (Canadian) listing mark and number “3KNN”.

G: FCC Mark. This logo indicates that the meter complies with part 15 of the FCC rules.

H: CE Mark. This logo indicates that the meter complies with the regulations of the European

Union for Product Safety and Electro-Magnetic Compatibility.

J: Status LEDs. These are status LEDs used to verify and diagnose meter operation. See Instal-

lation LED Diagnostics (p. 22)for details.

K: Current transformer (CT) voltage rating. These markings “0.333V~” indicate that the meter

must be used with CTs that generate a full-scale output of 0.333 Vac (333 millivolts).

L: DIP switch. This DIP switch block is used to set the BACnet MAC (network) address and baud

rate. See Setting the BACnet Address (p. 20).

M, N, O: Current transformer (CT) inputs. These indicate CT screw terminals. Note the white

and black circles at the left edge of the label: these indicate the color of the CT wire that should

be inserted into the corresponding screw terminal. The terminals marked with black circles are

connected together internally.

P: Auxiliary output terminal. This screw terminal is used for the X terminal options, such as

Option TM1, which adds support for an external thermistor.

Q: BACnet common terminal. This is the common or ground terminal for BACnet EIA RS-485

communication wiring. It is also the common for the X terminal options if they are installed.

R: BACnet signal terminals. These are the RS-485 A

–

and B+ signals (half-duplex, two-wire).

There are several names for these terminals:

○Inverting pin: A

–

, A,

–

, TxD

–

, RxD

–

, D0, and on rare devices “B”

○Non-inverting pin: B+, B, +, TxD+, RxD+, D1, and on rare devices “A”

S: Communication status. This LED indicates communication status. See BACnet Communica-

tion Diagnostics (p. 27)for details.

T: Serial number. This is the meter serial number. The barcode contains the serial number in Code

128C format.

U: Mains supply rated voltage. This is the rated supply voltage for this model. The V~indicates

AC voltage. For wye models, this voltage should appear between the Nand ØAterminals. For

delta models, this voltage should appear between the ØAand ØBterminals.

V: Mains frequencies. This indicates the rated mains frequencies for the meter.

W: Maximum rated volt-amps. This is the maximum apparent power consumption (volt-amps)

for this model.

X: Manufacture date. This is the date of manufacture for this WattNode meter.

Y: Caution, risk of electrical shock. This symbol indicates that there is a risk of electric shock

when installing and operating the meter if the installation instructions are not followed correctly.

Z: Attention - consult Manual. This symbol indicates that there can be danger when installing

and operating the meter if the installation instructions are not followed correctly.

Installation 9

Electrical Service Types

Below is a list of service or load types, showing voltages, WattNode types, and which terminals on

the WattNode meter operate the power supply. “non-N.A.” refers to non-North American electrical

services.

Electrical

Service (or Load) Types

Line-to-

Neutral (Vac)

Line-to-

Line

(Vac)

Meter

Service

Type

Meter

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

The terms “wye” and “delta” are commonly used to describe the configuration of the utility trans-

former providing the electrical service. We use them more generally, to refer to either the service or

the load. For example, a wye connected utility transformer might be used to provide three-phase

three-wire service to a motor: the motor is wired as a delta load (line-to-line), so we refer to this as

a “3 Phase 3 Wire Delta” configuration, because from the perspective of the meter, there are only

three line wires (no neutral) and the load is delta connected.

The WattNode models “WNC-3D-208-BN”, “WNC-3D-400-BN”, and “WNC-3D-480-BN” have

neutral Nterminals and may be used to monitor both three-wire (no neutral) and four-wire (with

neutral) circuits.

The wire count does NOT include ground. It only includes neutral (if present) and phase wires.

10 Installation

Single-Phase Two-Wire with Neutral

This configuration is most often seen in homes and offices. The two conductors are neutral and

line. For these models, the meter is powered from the Nand ØAterminals.

Up to three such circuits may be monitored with one meter by also using the ØBand ØCinputs.

Figure 2: Single-Phase Two-Wire Connection

Recommended WattNode Models

The following table shows the WattNode models that should be used, depending on the line to

neutral voltage.

Line to Neutral Voltage WattNode Model

120 Vac WNC-3Y-208-BN

230 Vac WNC-3Y-400-BN

277 Vac WNC-3Y-480-BN

Ground

WHITE

BLACK

ØB CT

ØC CT

ØA CT

ØB

ØC

ØA

Common

B+, D1, RxD+/TxD+

EIA-485

PC or BACnet Host

A−, D0, RxD−/TxD−

Continental Control Systems LLC

Status

B+

A-

MS/TP

Com

WNC-

WATTNODE

BACNET

-BN

Line

Neutral

LINE

LOAD

Shorting

Jumpers

Source

Face

Current

Transformer

3Y-xxx

Indice

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