7-ModHopper_H8035_H8036_InstallationGuide.pdf

Z201686-0N PAGE 1 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

TM

POWER MONITORING INSTALLATION GUIDE

ENERCEPT™ H8035/H8036

Networked Power Transducer (Modbus RTU)

US Patent No. 6,373,238

QUICK INSTALL

Disconnect and lock out power before installation.

1. Set the address switches located on the bottom of the CT.

2. Connect the voltage leads to the source to be monitored.

3. Snap the CT onto the conductor (observe color matching).

4. Connect the Modbus wires (observe polarity).

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

• Follow safe electrical work practices. See NFPA 70E in the USA, or applicable local codes.

• This equipment must only be installed and serviced by qualified electrical personnel.

• Read, understand and follow the instructions before installing this product.

• Turn off all power supplying equipment before working on or inside the equipment.

• Use a properly rated voltage sensing device to confirm power is off.

DO NOT DEPEND ON THIS PRODUCT FOR VOLTAGE INDICATION

• Only install this product on insulated conductors.

Failure to follow these instructions will result in death or serious injury.

A quali�ed person is one who has skills and knowledge related to the construction and operation of this electrical equipment and the installation, and has received safety training to recognize and avoid the hazards involved. NEC2009 Article 100 No responsibility is assumed by Veris Industries for any consequences arising out of the use of this material.

DANGER

NOTICE

• This product is not intended for life or safety applications.

• Do not install this product in hazardous or classified locations.

• The installer is responsible for conformance to all applicable codes.

• Mount this product inside a suitable fire and electrical enclosure.

FCC PART 15 INFORMATION

NOTE: This equipment has been tested by the manufacturer and found to comply with the limits for a class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Modifications to this product without the express authorization of Veris Industries nullify this statement.

CAUTION

RISK OF EQUIPMENT DAMAGE

• Enercept meters are rated for use at 50-60Hz. Do not connect this product to circuits with high harmonic energy, such as Variable Speed Drives (a.k.a. Variable Frequency Drives, Adjustable Frequency Drives) or similar sources, as these may permanently damage the product.

Failure to follow these instructions can result in overheating and permanent equipment damage.

For use in a Pollution Degree 2 or better environment only. A Pollution Degree 2 environment must control conductive pollution and the possibility of condensation or high humidity. Consider the enclosure, the correct use of ventilation, thermal properties of the equipment, and the relationship with the environment. Installation category: CAT II or CAT III

Installer’s Specifications

Measurement Accuracy:

System Accuracy ±1% of reading from 10% to 100% of the rated current* Type of Measurement One or three phase AC system Input Voltage Characteristics:

Measured AC Voltage 208-480 VAC Frequency Range 50/60 Hz Fuses 1/2A, 600VAC, 200 kAIC Input Current Characteristics:

Maximum Primary Current 100, 300, 400, 800, 1600, or 2400 A, continuous per phase** Meter Current Draw:

Maximum 60 mA AC Output:

Modbus RTU Protocol RS-485, 2-wire plus common Baud Rate 9600 Mechanical Conditions:

CT Case Isolation 600 VAC Internal Isolation 2000 VAC RMS Terminal Block Screw Torque 0.37 ft-lb (0.5 N·m) min.; 0.44 ft-lb (0.6 N·m) max.

Environmental Conditions:

Operating Temperature Range 2400 A model only: 0° to 50°C (32° to 122°F) all other models: 0° to 60°C (32° to 140°F) Storage Temperature Range -40° to 70°C (-40° to 158°F) Operating Humidity Range <95% RH non-condensing Agency Approvals:

US and Canada (cULus) UL508 (open type device)

* Meter accuracy specified with conductors centered in the CT window.

** For amperages greater than 2400A, see App Note VN19, www.veris.com/applicationnotes.aspx

TABLE OF CONTENTS

Quick Install 1

Operation 2

Product Identification 2

Dimensions 2

Product Diagram 2

Installation 3

Wiring 4

Data Outputs 4

Address Setup 5

Modbus Register Addressing 6

Using Integer Data Types 8

Notes 10

Troubleshooting 10

Z201686-0N PAGE 2 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

TM

H8035/H8036 INSTALLATION GUIDE

DIMENSIONS

A

B

E

F

C D

B

E

F

C D

A

A

B

E

C

F

D

SMALL

100/300 Amp

MEDIUM

400/800 Amp

LARGE

800/1600/2400 Amp

A = 3.8" (96 mm) B = 1.2" (30 mm) C = 1.3" (31 mm) D = 1.2" (30 mm) E = 4.0" (100 mm) F = 4.8" (121 mm)

A = 4.9" (125 mm) B = 2.9" (73 mm) C = 2.5" (62 mm) D = 1.2" (30 mm) E = 5.2" (132 mm) F = 6.0" (151 mm)

A = 4.9" (125 mm) B = 5.5" (139 mm) C = 2.5" (62 mm) D = 1.2" (30 mm) E = 7.9" (201 mm) F = 6.0" (151 mm)

OPERATION

The H8035 and H8036 three-phase power transducers monitor energy parameters from aggregate kW (real power) and kWh (consumption) to power factor per phase.

Integration of electronics lowers hardware and installation costs. The sensors automatically detect phase reversal, so CT load orientation is not a concern. The CTs and electronics are calibrated as a set, so it is necessary to color-match the CTs and voltage leads when installing. These devices monitor up to 63 loads at a time on a single RS-485 drop.

With two platforms to choose from (H8035 Basic/Energy Only or H8036 Enhanced Data Stream), the applications for these devices are diverse, including aggregate billing, tenant monitoring, energy management, performance contracting, demand limiting and cooling plant optimization.

PRODUCT IDENTIFICATION

Modbus Enhanced Data Stream Power Transducers*

MODEL MAX. AMPS CT SIZE

H8036-0100-2 100 SMALL

H8036-0300-2 300 SMALL

H8036-0400-3 400 MEDIUM

H8036-0800-3 800 MEDIUM

H8036-0800-4 800 LARGE

H8036-1600-4 1600 LARGE

H8036-2400-4 2400 LARGE

*H8036 models work with H8920-1 LON nodes

Modbus Basic Power Transducers*

MODEL MAX. AMPS CT SIZE

H8035-0100-2 100 SMALL

H8035-0300-2 300 SMALL

H8035-0400-3 400 MEDIUM

H8035-0800-3 800 MEDIUM

H8035-0800-4 800 LARGE

H8035-1600-4 1600 LARGE

H8035-2400-4 2400 LARGE

*H8035 models work with H8920-5 LON nodes

PRODUCT DIAGRAM

Enercept®

3 4 5 6

1. Voltage leads

2. Fuses

3. Modbus connector

4. Status LED: Blink codes: slow green for normal operation; slow red for incorrect wiring or low power factor (less than 0.5); fast red for maximum current exceeded.

5. Modbus address switches

6. External CTs: Permanently attached; do not disconnect or use with other power transducers.

Color match CTs and voltage leads! Example: clamp the red labeled CT around the power conductor connected to the red voltage wire.

Z201686-0N PAGE 3 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

TM

H8035/H8036 INSTALLATION GUIDE

INSTALLATION

Disconnect and lock out power before installation.

The Enercept meter, including the current transformers (CTs), voltage connection fuses, and fuse pack, is permitted within electrical distribution equipment including but not limited to panelboards, switchboards, motor control centers, and transformers. Carefully review the equipment in which the Enercept meter will be installed. Consider the following installation conditions during the installation process:

• Review the equipment enclosure for ventilation openings. Wires will cross many of these openings in a normal installation, however, do not install the Enercept where it will substantially block ventilation openings in the enclosure.

• The Enercept meter and the wiring installed within a wiring space or gutter should not exceed 75 percent cross sectional fill at the Enercept meter parts as addressed in the NEC. Improper installation of Enercept meter in the wire gutter of equipment may affect the thermal performance of the equipment.

• Consider the arrangement of CTs within the equipment to ensure the correct bending radius of conductors.

• Review the arrangement and location of the CTs within the equipment.

Use appropriate support for the CT to prevent undue strain on the conductor.

1. Choose a unique address and set the switches for that address as shown in the Address Selection Switches section. Only addresses 1 to 63 can be used.

2. Connect the voltage leads to the phase conductors at a location that is not normally turned off. Connect voltage leads on the Line side of the conductor to ensure constant power to the Enercept. For a 3-phase system, connect the red lead to phase A, black to phase B, and yellow to phase C. See the Wiring section on the following page.

3. Snap the CT onto the conductor.

Connect CTs to the correspondingly colored voltage leads. If the application can exceed 20 times the rated CT current, use wire ties to secure the I-bar to the CT housing.

This CT automatically detects phase reversal, so CT load orientation is not important.

Wire tie

RS-485

CONNECTION

STATUS+

Shield

ADDRESS

4. Remove the terminal block and attach the RS-485 wires. Observe (+), (-), and Shield polarity. Insulate any exposed wiring.

SHIELD SHIELD

S S

SHIELD

120Ω Terminator

5. For information regarding software setup, see the Modbus protocol specifications available at www.veris.com/Modbus/.

6. Check power reading (these calculations are approximations only).

Expected power:

kW = Volts x Amps x 1.732 x PF / 1000 kW = Horsepower x 0.746

Z201686-0N PAGE 4 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

TM

H8035/H8036 INSTALLATION GUIDE

WIRING

Typical 208/480 VAC 3Ø, 3- or 4- Wire Installation

MODBUS RS-485 LINE

ØB

ØA

ØC

Typical 240/120 VAC 1Ø, 3-Wire Installation

Neutral

MODBUS RS-485 LINE

To additional MODBUS Devices

ØA

ØB

Typical 277 VAC 1Ø, 2-Wire Installation

Neutral

MODBUS RS-485 LINE

To additional MODBUS Devices

ØA

DATA OUTPUTS

H8035 kWh, consumption Reset kWh kW, demand

H8036 kWh, consumption kW, real power kVAR, reactive power kVA, apparent power Power factor Average real power Minimum real power Maximum real power Voltage, line-to-line Voltage, line-to-neutral Amps, average current kW, real power ØA kW, real power ØB kW, real power ØC Power factor ØA Power factor ØB Power factor ØC Voltage, ØA to ØB Voltage, ØB to ØC Voltage, ØAto ØC Voltage, ØA to Neutral Voltage, ØB to Neutral Voltage, ØC to Neutral Amps, Current ØA Amps, Current ØB Amps, Current ØC

Note: The Enercept cannot communicate on the network bus without power.

Therefore, it is best to connect the voltage leads ahead of switching devices.

Z201686-0N PAGE 5 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

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H8035/H8036 INSTALLATION GUIDE

ADDRESS SETUP

Set these switches to assign a unique address before connecting the device to the Modbus RS-485 line. Each Modbus device must have a unique address. If two devices are given the same address, neither device will be able to communicate.

Z201686-0N PAGE 6 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

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H8035/H8036 INSTALLATION GUIDE

MODBUS REGISTER ADDRESSING

This table lists the addressed assigned to each data point. Registers are read MostSignificant Byte (MSB) first. 32 bit floating point values are encoded per IEEE Standard 754.

For floating point format variables, each data point appears twice because two 16-bit addresses are required to hold a 32-bit float value. The 16 bit Most Significant Word (MSW) is in the lower address of the register pair, while the least Significant Word (LSW) is in the upper address.

Modbus RTU function codes supported: 3=read holding registers; 6=preset single register; 17=report Slave I.D.

Quick Reference of the Most Common Data Points

Address Typical

Offset

Units Description Integer:

multiplier required

Float:

upper 16 bits

Float:

lower 16 bits 40001 0 kWh Energy Consumption, LSW X 40002 1 kWh Energy Consumption, MSW X 40003 2 kW Real Power X

40257 --- kWh Energy Consumption X 40258 kWh Energy Consumption X 40259 0 kWh Energy Consumption (same 40257) X 40260 kWh Energy Consumption (same 40258) X 40261 2 kW Real Power X 40262 kW Real Power X

Complete Listing of Data Points

Address Typical Offset

Units Description Integer:

multiplier required

Float:

upper 16 bits

Float:

lower 16 bits 40001 0 kWh Energy Consumption, LSW X 40002 1 kWh Energy Consumption, MSW X 40003 2 kW Real Power X 40004 3 kVAR Reactive Power X 40005 4 kVA Apparent Power X 40006 5 --- Power Factor X 40007 6 Volts Voltage, line to line X 40008 7 Volts Voltage, line to neutral X 40009 8 Amps Current X 40010 9 kW Real Power, Phase A X 40011 10 kW Real Power, Phase B X 40012 11 kW Real Power, Phase C X 40013 12 --- Power Factor, phase A X 40014 13 --- Power Factor, phase B X 40015 14 --- Power Factor, phase C X 40016 15 Volts Voltage, phase A-B X 40017 16 Volts Voltage, phase B-C X 40018 17 Volts Voltage, phase A-C X 40019 18 Volts Voltage, phase A-N X 40020 19 Volts Voltage, phase B-N X 40021 20 Volts Voltage, phase C-N X 40022 21 Amps Current, phase A X 40023 22 Amps Current, phase B X 40024 23 Amps Current, phase C X 40025 24 kW Average Real Power X 40026 25 kW Minimum Real Power X 40027 26 kW Maximum Real Power X

40257 --- kWh Energy Consumption X 40258 kWh Energy Consumption X 40259 0 kWh Energy Consumption (same 40257) X 40260 kWh Energy Consumption (same 40258) X 40261 2 kW Real Power X 40262 kW Real Power X

Z201686-0N PAGE 7 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

TM

H8035/H8036 INSTALLATION GUIDE

Address Typical Offset

Units Description Integer:

multiplier required

Float:

upper 16 bits

Float:

lower 16 bits 40263 4 kVAR Reactive Power X 40264 kVAR Reactive Power X 40265 6 kVA Apparent Power X 40266 kVA Apparent Power X 40267 8 --- Power Factor X 40268 --- Power Factor X 40269 10 Volts Voltage, line to line X 40270 Volts Voltage, line to line X 40271 12 Volts Voltage, line to neutral X 40272 Volts Voltage, line to neutral X 40273 14 Amps Current X 40274 Amps Current X 40275 16 kW Real Power, phase A X 40276 kW Real Power, phase A X 40277 18 kW Real Power, phase B X 40278 kW Real Power, phase B X 40279 20 kW Real Power, phase C X 40280 kW Real Power, phase C X 40281 22 --- Power Factor, phase A X 40282 --- Power Factor, phase A X 40283 24 --- Power Factor, phase B X 40284 --- Power Factor, phase B X 40285 26 --- Power Factor, phase C X 40286 --- Power Factor, phase C X 40287 28 Volts Voltage, phase A-B X 40288 Volts Voltage, phase A-B X 40289 30 Volts Voltage, phase B-C X 40290 Volts Voltage, phase B-C X 40291 32 Volts Voltage, phase A-C X 40292 Volts Voltage, phase A-C X 40293 34 Volts Voltage, phase A-N X 40294 Volts Voltage, phase A-N X 40295 36 Volts Voltage, phase B-N X 40296 Volts Voltage, phase B-N X 40297 38 Volts Voltage, phase C-N X 40298 Volts Voltage, phase C-N X 40299 40 Amps Current, phase A X 40300 Amps Current, phase A X 40301 42 Amps Current, phase B X 40302 Amps Current, phase B X 40303 44 Amps Current, phase C X 40304 Amps Current, phase C X 40305 46 kW Average Real Power X 40306 kW Average Real Power X 40307 48 kW Minimum Real Power X 40308 kW Minimum Real Power X 40309 50 kW Maximum Real Power X 40310 kW Maximum Real Power X

Modbus addresses in the 4xxxx format follow the Modicon protocol specification for point addressing. The actual address sent is the value shown, minus 40001. In other words, the leading “4” is omitted, and the remaining 4-digit number is decremented so that point 40001 is requested with a value of zero in the actual Modbus communication. Some Modbus implementations require point addresses to be specified beginning at zero or 40000, instead of 40001. Programming code may also require addresses that correspond to actual values transmitted, so a value of zero is used to request data beginning at Modbus address 40001.

Many applications use a single Modbus command to read all of the data available from the Enercept. For integers, the beginning address is 40001 (or zero in the actual Modbus command), and for floating points the first address used is typically 40259 (or 258 in the actual Modbus command). Although the first floating point appears at address 40257, it is not necessary to read this value because it is a duplicate copy of the kWh value (required by the product firmware). When reading a block of data, the “typical offset” values index to the data within the block.

“Multiplier required” indicates that multiplication is required to properly scale the integer value. See Using Integer Data Types section.

Z201686-0N PAGE 8 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

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H8035/H8036 INSTALLATION GUIDE

USING INTEGER DATA TYPES

Unlike the floating-point data type, the integer data type can only represent whole numbers between zero and 65535. To convert a data point value into the number it represents, multiply the value by a constant, as indicated in the table below.

Some data points require different multipliers for each amperage range, while others (e.g. volts and power factor) use the same multiplier regardless of the amperage range of the product. The latter are indicated by single row values.

Addr Units 100A 300/400A 800A 1600A 2400A

40001 kWh 7.81E-03 0.03125 0.0625 0.125 0.25

40002 kWh 512 2048 4096 8192 16384

40003 kW 0.004 0.016 0.032 0.064 0.128

40004 kVAR 0.004 0.016 0.032 0.064 0.128

40005 kVAR 0.004 0.016 0.032 0.064 0.128

40006 --- 3.0518E-5

40007 Volts 0.03125

40008 Volts 0.015625

40009 Amps 3.906E-03 0.015625 0.03125 0.0625 0.1250

40010 kW 0.001 0.004 0.008 0.016 0.032

40011 kW 0.001 0.004 0.008 0.016 0.032

40012 kW 0.001 0.004 0.008 0.016 0.032

40013 --- 3.0518E-5

40014 --- 3.0518E-5

40015 --- 3.0518E-5

40016 Volts 0.03125

40017 Volts 0.03125

40018 Volts 0.03125

40019 Volts 0.015625

40020 Volts 0.015625

40021 Volts 0.015625

40022 Amps 3.906E-03 0.015625 0.03125 0.0625 0.1250

40023 Amps 3.906E-03 0.015625 0.03125 0.0625 0.1250

40024 Amps 3.906E-03 0.015625 0.03125 0.0625 0.1250

40025 kW 0.004 0.016 0.032 0.064 0.128

40026 kW 0.004 0.016 0.032 0.064 0.128

40027 kW 0.004 0.016 0.032 0.064 0.128

Z201686-0N PAGE 9 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

TM

H8035/H8036 INSTALLATION GUIDE

As an alternative to the table on the previous page, invert the values for use as divisors, in which the integer value returned by the Enercept is divided by a number from the table below. In most cases, the divisors are a more compact number.

Addr Units 100A 300/400A 800A 1600A 2400A

40001 kWh 128 32 16 8 4

40002 kWh 1.9531E-3 4.8828E-4 2.4414E-4 1.2207E-4 6.1035E-5

40003 kW 250 62.5 31.25 15.625 7.8125

40004 kVAR 250 62.5 31.25 15.625 7.8125

40005 kVA 250 62.5 31.25 15.625 7.8125

40006 --- 32768

40007 Volts 32

40008 Volts 64

40009 Amps 256 64 32 16 8

40010 kW 1000 250 125 62.5 31.25

40011 kW 1000 250 125 62.5 31.25

40012 kW 1000 250 125 62.5 31.25

40013 --- 32768

40014 --- 32768

40015 --- 32768

40016 Volts 32

40017 Volts 32

40018 Volts 32

40019 Volts 64

40020 Volts 64

40021 Volts 64

40022 Amps 256 64 32 16 8

40023 Amps 256 64 32 16 8

40024 Amps 256 64 32 16 8

40025 kW 250 62.5 31.25 15.625 7.8125

40026 kW 250 62.5 31.25 15.625 7.8125

40027 kW 250 62.5 31.25 15.625 7.8125

Z201686-0N PAGE 10 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / support@veris.com 08122 Alta Labs, Enercept, Enspector, Hawkeye, Trustat, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.

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H8035/H8036 INSTALLATION GUIDE

TROUBLESHOOTING

Problem Solution

Status LED does not blink Check fuses and voltage connections. Status LED should blink regardless of CTs, Modbus connections, and DIP switch setting.

Enercept interferes with another device on the Modbus network

Set DIP switches to a different Modbus address not in use.

Readings seem highly inaccurate. • Check that each CT is installed on the conductor with the corresponding color voltage input lead attached. In most cases, incorrect wiring will cause the Status LED to blink red (slowly). However, a power factor lower than 0.5 could cause the LED to blink this way, even if the unit is installed properly.

• It does not matter which side of the CT faces towards the load.

• If current is below 7% of full scale maximum for the

CT, use a smaller CT or wrap each wire through the CT multiple times

• Check current with an amp-clamp.

Expected power:

kW = Volts x Amps x 1.732 x PF / 1000 kW = Horsepower x 0.746 PF is usually 0.7 to 0.95, depending on the load.

Enercept goes offline when load is switched off.

Connect voltage leads on the Line side of the conductor.

The Enercept cannot communicate on the Modbus network without voltage.

Status LED blinks red. • If the LED blinks quickly (i.e., about 5 blinks in two seconds), then use a CT with a higher amp rating.

• If the LED blinks slowly (i.e., about 1 blink per second), then the CTs are not installed on the correct conductors or the power factor is less than 0.5. The Enercept can accurately measure these low PFs, but few loads operate normally at such a low power factor.

• If the LED blinks slowly (i.e., about 1 blink per second), the monitored load might be less than 10% of the CT maximum ratings.

NOTES

1. DO NOT GROUND THE SHIELD INSIDE THE ELECTRICAL PANEL. Insulate all Modbus wires, including the shield, to prevent accidental contact with high voltage conductors.

2. Mechanically secure the Modbus cable where it enters the electrical panel.

3. Connect all Modbus devices in a daisy-chain fashion. Use a 120 Ω terminating resistor between (+) and (-) on the first and last devices in the chain.

4. Use shielded twisted pair wire BELDEN 1120A or similar for the Modbus cable.

WARNING: After wiring, remove all scraps of wire or foil shield from the electrical panel. This could be DANGER- OUS if wire scraps come into contact with high voltage wires!