WattNode WNC-3Y-208-MB Manuale utente

WattNode®Modbus

Installation and Operation Manual

●WNC-3Y-208-MB

●WNC-3Y-400-MB

●WNC-3Y-480-MB

●WNC-3Y-600 -MB

●WNC-3D-240-MB

●WNC-3D-400-MB

●WNC-3D-480-MB

http://www.ccontrolsys.com

Continental Control Systems LLC

Rev 1.16 c

(M7)

Information in this document is subject to change without notice.

Printed in the United States of America.

Document Number: WNC-MB-1.16c

Firmware Version: 16

Revision Date: January 28, 2011

Continental Control Systems, LLC.

3131 Indian Rd., Suite A

Boulder, CO 80301

(303) 444-7422

FAX: (303) 444-2903

E-mail: techsupport@ccontrolsys.com

Web: http://www.ccontrolsys.com

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

FCC Information

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

ant 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

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

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

Communication ............................................................................................................................... 5

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

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

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

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

Front Label ...................................................................................................................................... 7

Symbols.................................................................................................................................... 8

Installation .............................................................................................................................9

Precautions ..................................................................................................................................... 9

Electrical Service Types ..................................................................................................................10

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

Setting the Modbus Address ..........................................................................................................19

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

Connecting Modbus Outputs......................................................................................................... 20

Planning the Modbus Network ................................................................................................ 20

Installation Summary ..................................................................................................................... 22

Wiring ..................................................................................................................................... 22

Installation LED Diagnostics........................................................................................................... 23

Measurement Troubleshooting....................................................................................................... 26

Other Fixed Pattern ................................................................................................................. 26

Modbus Communication Diagnostics ............................................................................................ 28

Operating Instructions.........................................................................................................31

Quick Start.....................................................................................................................................31

WattNode Basic Configuration .................................................................................................31

Verify Operation .......................................................................................................................31

Modbus Communication ............................................................................................................... 32

Modbus Functions .................................................................................................................. 32

Measurement Overview........................................................................................................... 32

Report Slave ID ....................................................................................................................... 33

Modbus Register Lists................................................................................................................... 33

Modbus Register Addressing .................................................................................................. 33

Floating Point and Integer Registers ........................................................................................ 34

Reading and Writing 32 Bit Registers ...................................................................................... 34

Basic Register List - Floating Point .......................................................................................... 35

Basic Register List - Integer..................................................................................................... 35

Advanced Register List - Floating Point ................................................................................... 36

Advanced Register List - Integer...............................................................................................37

Configuration Register List ...................................................................................................... 38

Communication Register List................................................................................................... 39

Diagnostic Register List........................................................................................................... 39

Option Information Registers ................................................................................................... 40

Custom Register Map ............................................................................................................. 40

Basic Registers ..............................................................................................................................41

Energy Registers ......................................................................................................................41

Power Registers.......................................................................................................................41

Voltage Registers .................................................................................................................... 42

Frequency ............................................................................................................................... 42

Advanced Registers ...................................................................................................................... 42

Per-Phase Energy Registers .................................................................................................... 42

Positive Energy........................................................................................................................ 42

Negative Energy ...................................................................................................................... 43

Reactive Energy ...................................................................................................................... 43

Apparent Energy ..................................................................................................................... 43

Power Factor........................................................................................................................... 43

Reactive Power ....................................................................................................................... 44

Apparent Power ...................................................................................................................... 44

Current.................................................................................................................................... 45

Demand.................................................................................................................................. 45

IO Pin Options..........................................................................................................................47

Configuration Registers ..................................................................................................................47

Demand Configuration ............................................................................................................ 49

Zeroing Registers .................................................................................................................... 50

IO Pin Options Configuration ....................................................................................................51

Communication Registers...............................................................................................................51

Diagnostic Registers...................................................................................................................... 52

Error Codes................................................................................................................................... 53

Maintenance and Repair................................................................................................................ 55

Specifications ......................................................................................................................56

Models .......................................................................................................................................... 56

Model Options ........................................................................................................................ 56

Accuracy................................................................................................................................. 57

Measurement ................................................................................................................................ 58

Modbus Communication ............................................................................................................... 58

Electrical ....................................................................................................................................... 59

Certifications ................................................................................................................................. 60

Environmental................................................................................................................................ 60

Mechanical.................................................................................................................................... 60

Current Transformers..................................................................................................................... 60

Warranty...............................................................................................................................62

Limitation of Liability ...................................................................................................................... 62

Overview 5

Overview

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

The WattNode meter offers precision energy and power measurements in a compact pack-

age. It enables you to make power and energy measurements within existing electric service

panels avoiding the costly installation of subpanels and associated wiring. It is designed for use

in demand side management (DSM), sub-metering, and energy monitoring applications. The

WattNode meter communicates on an EIA RS-485 two-wire bus using the Modbus 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.

Measurements

The WattNode Modbus 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 Modbus meter can measure up to three different “single-phase two-wire with

neutral” 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.

Communication

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

baud rates are 9,600 and 19,200 baud, and rates from 1,200 to 38,400 baud can be configured.

The meter uses the industry standard Modbus RTU (binary) communication protocol, allowing

up to 127 devices per RS-485 subnet. The WattNode meter can auto-detect RS-485 polarity on

properly biased networks, simplifying installation.

There are numerous low-cost RS-485 interfaces to PCs, using both USB and serial ports. There

are many PC programs and standalone devices for collecting and recording Modbus data.

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, red for negative power, and yellow for low power

factor. Other conditions are signaled with different LED patterns. See Installation LED Diagnos-

tics (pg 23)for details.

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

diagnose the RS-485 network. See Modbus Communication Diagnostics (pg 28)for details.

Options

The WattNode Modbus meter can be ordered with several options. For more details and docu-

mentation, see article WattNode Modbus - Options on our website.

6 Overview

General Options

●Option CT=xxx - Pre-assign xxx as the global CtAmps value.

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

CtAmpsC.

Communication Options

●Option EP - Factory configure the Modbus RS-485 communications to even parity (E81).

●Option 19K - Factory configure the RS-485 communications 19,200 baud. Position 8 of the

DIP switch will be ignored.

●Option 38K - Factory configure the RS-485 communications to 38,400 baud. Position 8 of

the DIP switch will be ignored.

●Option TCP‑RTU - Configure the communications to the Modbus TCP-RTU protocol option

for use with RS-485 to Ethernet gateways (serial device adapters).

●Option AD - Factory configure the Modbus address. The DIP switch address will be ignored.

X Terminal Options

These options utilize the X(auxiliary) terminal on the MODBUS connector. Only one of these can

be ordered on any single meter.

●Option X5 - Provides 5 VDC at up to 60 milliamps between the C(common) and X(5V)

terminals.

●Option IO - Provides a digital input (level sensing and pulse counting) or output (for load

shedding and other applications) on the Xterminal.

●Option SSR - Provides a solid-state relay (contact closure) output between the Xand C

terminals for load shedding and other applications.

Special Options

Contact the factory about the following special options:

●Option 232 - Provide RS-232 I/O in place of RS-485.

●Option TTL - Provide 5V TTL UART I/O in place of RS-485.

Current Transformers

The WattNode meter uses solid-core (toroidal), split-core (opening), and bus-bar current trans-

formers (CTs) with a full-scale voltage output of 0.333 Vac. Split-core and bus-bar CTs are easier

to install without disconnecting the circuit being measured. Solid-core CTs are more compact,

generally more accurate, and less expensive, but installation requires that the measured circuit be

disconnected.

Additional Literature

These additional documents are available on the Continental Control Systems, LLC website or

Modbus.org website.

●WattNode Modbus - Quick Install Guide

●WattNode Modbus Register List (Excel format): WNC-Modbus-Register-List-V16.xls

●Continental Control Systems, LLC website

○http://www.ccontrolsys.com/w/WattNode_Modbus - main page.

○http://www.ccontrolsys.com/w/Category:WattNode_Modbus - support articles.

●http://www.modbus.org/specs.php

○Modbus Application Protocol Specification - V1.1b

○Modbus over Serial Line - Specification & Implementation Guide - V1.0

Overview 7

Front Label

This section describes the connections, information, and symbols on the front label.

Continental Control Systems LLC

Watthour Meter

US LISTED 3KNN

Boulder, CO USA

277V277V

ØB CT

0.333V~

ØC CT

0.333V~

ØA CT

0.333V~Status

Status

B+

A-

MODBUS

Com

ØB

ØC

ØA

Ø-Ø 240V~Ø-Ø 240V~

240V CAT III240V CAT III

Ø-N 140V~Ø-N 140V~

120V~50-60Hz 3W

2008-09-26SN 29063

1 2 3 4 5 6 7 8

WATTNODE

MODBUS

WNC-3Y-208-MB

UV W

HIJ

Figure 1: Front Label Diagram

A: WattNode model number. The “WNC” indicates a third generation WattNode meter with

diagnostic LEDs. 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 “MB” indicates

Modbus 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.

C: Neutral. This terminal “N” should be connected to neutral when available.

D, E, F: 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 Ntermi-

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

G: 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 (pg 56)for more informa-

tion about the measurement voltage and category.

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

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

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

lation LED Diagnostics (pg 23)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 Modbus address and baud rate. See

Setting the Modbus Address (pg 19).

8 Overview

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.

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

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

R: Modbus 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 Modbus Communi-

cation Diagnostics (pg 28)for details.

T: Serial number. This shows meter serial number and options if any are selected. 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 power. This is the maximum power consumption (watts) 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.

Symbols

Attention -

Consult Installation

and Operation Manual

Read, understand, and follow all instructions in this Installa-

tion and Operation Manual including all warnings, cautions,

and precautions before installing and using the product.

Caution –

Risk of Electrical

Shock

Potential Shock Hazard from Dangerous High Voltage.

CE Marking

Complies with the regulations of the European Union for

Product Safety and Electro-Magnetic Compatibility.

●Low Voltage Directive – EN 61010-1: 2001

●EMC Directive – EN 61327: 1997 + A1/1998 + A2/2001

Installation 9

Installation

Precautions

DANGER — HAZARDOUS VOLTAGES

WARNING - These installation/servicing instructions are for use by qualified personnel

only. To avoid electrical shock, do not perform any servicing other than that contained in

the operating instructions unless you are qualified to do so.

Always adhere to the following checklist:

1) Only qualified personnel or licensed electricians should install the WattNode meter. The

mains voltages of 120Vac to 600Vac can be lethal!

2) Install the meter in an electrical enclosure (panel or junction box) or in a limited access electri-

cal room.

3) Verify that circuit voltages and currents are within the proper range for the meter model.

4) Use only UL recognized current transformers (CTs) with built-in burden resistors, that gener-

ate 0.333Vac (333 millivolts AC) at rated current. Do not use current output (ratio) CTs

such as 1amp or 5 amp output CTs: they will destroy the WattNode meter and may

create a shock hazard. See Current Transformers (pg 60)for CT maximum input cur-

rent ratings.

5) Ensure that the line voltage inputs to the meter have either fuses or circuit breakers on each

voltage phase (not needed for the neutral wire). See Circuit Protection (pg 18)for details.

6) Equipment must be disconnected from the HAZARDOUS LIVE voltages before access.

7) The terminal block screws are not insulated. Do not contact metal tools to the screw termi-

nals if the circuit is live!

8) Do not place more than one line voltage wire in a screw terminal; use wire nuts instead. You

may use more than one CT wire per screw terminal.

9) Before applying power, ensure that all the wires are securely installed by tugging on each

wire.

10) Do not install the meter where it may be exposed to temperatures below -30°C or above

55°C, excessive moisture, dust, salt spray, or other contamination. The meter requires an

environment no worse than pollution degree 2 (normally only non-conductive pollution;

occasionally, a temporary conductivity caused by condensation must be expected).

11) Do not drill mounting holes using the meter as a guide; the drill chuck can damage the screw

terminals and metal shavings can fall into the connectors, causing an arc risk.

12) If the meter is installed incorrectly, the safety protections may be impaired.

10 Installation

Electrical Service Types

Below is a list of service types, with connections and recommended models. Note: the ground

connection improves measurement accuracy, but is not required for safety.

Model Type Line-to-

Neutral

Line-to-

Line

Electrical

Service Types

WNC-3Y-208-MB Wye 120 Vac 208–240

Vac

1 Phase 2 Wire 120V with neutral

1 Phase 3 Wire 120V/240V with neutral

3 Phase 4 Wire Wye 120V/208V with neutral

WNC-3Y-400-MB Wye 230 Vac 400 Vac 1 Phase 2 Wire 230V with neutral

3 Phase 4 Wire Wye 230V/400V with neutral

WNC-3Y-480 -MB Wye 277 Vac 480 Vac 3 Phase 4 Wire Wye 277V/480V with neutral

1 Phase 2 Wire 277V with neutral

WNC-3Y-600-MB Wye 347 Vac 600 Vac 3 Phase 4 Wire Wye 347V/600V with neutral

WNC-3D-240-MB Delta

or Wye

120 –140

Vac

208–240

Vac

1 Phase 2 Wire 208V (no neutral)

1 Phase 2 Wire 240V (no neutral)

1 Phase 3 Wire 120V/240V with neutral

3 Phase 3 Wire Delta 208V (no neutral)

3 Phase 4 Wire Wye 120V/208V with neutral

3 Phase 4 Wire Delta 120/208/240V with neutral

WNC-3D-400-MB Delta

or Wye 230 Vac 400 Vac 3 Phase 3 Wire Delta 400V (no neutral)

3 Phase 4 Wire Wye 230V/400V with neutral

WNC-3D-480-MB Delta

or Wye 277 Vac 480 Vac

3 Phase 3 Wire Delta 480V (no neutral)

3 Phase 4 Wire Wye 277V/480V with neutral

3 Phase 4 Wire Delta 240/415/480V with neutral

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

Table 1 : WattNode Models

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.

Figure 2: Single-Phase Two-Wire Connection

Ground

WHITE

BLACK

ØB CT

ØC CT

ØA CT

ØB

ØC

ØA

Common

B+, D1, RxD+/TxD+

EIA-485

PC or Logger

A−, D0, RxD−/TxD−

Continental Control Systems LLC

Status

B+

A-

MODBUS

Com

WNC-

WATTNODE

MODBUS

-MB

Line

Neutral

LINE

LOAD

Shorting

Jumpers

Source

Face

Current

Transformer

3Y-xxx

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