Rockwell Automation 1404-M4, 1404-M5, 1404-M6, 1404-M8 User Manual

Installation Instruction

Powermonitor 3000

(Catalog Numbers: 1404-M4, 1404-M5, 1404-M6, 1404-M8)

Inside. . .

Important User Information............................................................... 2

European Communities (EC) Directive Compliance ........................3

Using This Installation Instruction ....................................................4

Safety Considerations.........................................................................6

Product Description...........................................................................7

Master Module....................................................................................8

Display Module ................................................................................ 10

LED Indicators.................................................................................. 11

Quick Start Guidelines.....................................................................15

Installation........................................................................................15

System Accuracy Considerations.....................................................17

Wiring ............................................................................................... 19

Wiring Diagrams ..............................................................................23

Communication Wiring....................................................................38

Maintenance .....................................................................................51

Catalog Number Explanation .......................................................... 55

Dimension Drawings ....................................................................... 56

Product Approvals ........................................................................... 57

Technical Specifications................................................................... 59

1 Publication 1404-IN007D-EN-P - October 2004

2 Powermonitor 3000

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

Identifies information that is critical for successful application and understanding of the product.

Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you:

• identify a hazard

• avoid a hazard

• recognize the consequence

Labels may be located on or inside the drive to alert people that dangerous voltage may be present.

Labels may be located on or inside the drive to alert people that surfaces may be dangerous temperatures.

Publication 1404-IN007D-EN-P - October 2004

Powermonitor 3000 3

European Communities (EC) Directive Compliance

If this product has the CE mark, it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet the Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:

This product is intended for use in an industrial environment.

• EN 50081-2 EMC — Generic Emission Standard, Part 2 —

Industrial Environment

• EN 50082-2 EMC — Generic Immunity Standard, Part 2 —

Industrial Environment

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of IEC 1010-1, Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use.

This equipment is classified as an open style device. Open style devices must be provided with environmental and safety protection by proper mounting in enclosures designed for specific application conditions. See NEMA Standards publication 250 and IEC publication 529, as applicable, for explanations of the degrees of protection provided by different types of enclosure.

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4 Powermonitor 3000

Using This Installation Instruction

What This Manual Doesn’t Contain

This manual does not contain the following information. Except as noted, refer to the Powermonitor 3000 User Manual, Publication 1404-UM001 for detailed information on the topics in this list.

• Information on metering functionality and measurements

• Use of the Display Module for configuration, monitoring and

commands

• Discussion of communications options, functionality,

configuration and operation

• Setpoint configuration and operation

• Discrete I/O configuration and operation

• Data logging including Event Log, Trend Log, Min/Max Log,

Load Factor Log

• Advanced features including Oscillography, Harmonic Analysis

and Transient Detection

• Powermonitor 3000 data tables

• Sample ladder diagrams for communicating with the

Powermonitor 3000 using various communications options

• Display module installation instructions (refer to Publication

1404-IN005)

For More Information on Additional Power Quality Products

Table 1 Related Documentation

For this information: Refer to Publication:

Powermonitor 3000 User Manual 1404-UM001

Powermonitor 3000 Display Module Installation Instructions

Bulletin 1403 Powermonitor II Tutorial 1403–1.0.2

Ethernet Series B Release Note 1404-RN008

1404-IN005

Publication 1404-IN007D-EN-P - October 2004

Powermonitor 3000 5

Terms and Conventions

In this manual, the following terms and conventions are used:

Table 2

Abbreviation Term

AWG American Wire Gage

CSA Canadian Standards Association

CT Current Transformer

DM Display Module

EMI Electromagnetic Interference

ID Identification

IEC International Electrotechnical Commission

LED Light Emitting Diode

NEMA National Electrical Manufacturers Association

PLC Programmable Logic Controller

PT Potential Transformer

(Also known as VT in some countries)

RAM Random Access Memory

RFI Radio Frequency Interference

R I/O Remote Input/Output

RMS Root–mean–square

SLC Small Logic Controller

SPDT Single Pole Double Throw

UL Underwriters Laboratories

VA Volt–ampere

VAR Volt–ampere Reactive

CIP Control and Information Protocol

NAP Network Access Port

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6 Powermonitor 3000

Safety Considerations

ATTENTION

Only qualified personnel, following accepted safety procedures, should install, wire and service the Powermonitor 3000 and its associated components. Before beginning any work, disconnect all sources of power and verify that they are de-energized and locked out. Failure to follow these instructions may result in personal injury or death, property damage or economic loss.

Never open a current transformer (CT) secondary circuit with primary current applied. Wiring between the CTs and the Powermonitor 3000 should include a shorting terminal block in the CT secondary circuit. Shorting the secondary with primary current present allows other connections to be removed if needed. An open CT secondary with primary current applied produces a hazardous voltage, which can lead to personal injury, death, property damage or economic loss.

IMPORTANT

The Powermonitor 3000 is not designed for nor intended for use as a circuit protective device. Do not use this equipment in place of a motor overload relay or circuit protective relay.

The relay output contacts and solid-state KYZ output contacts on the Powermonitor 3000 may be used to control other devices through setpoint control or communications. The response of these outputs to a communications failure is configurable by the user. Refer to Publication 1404-UM001 for information on configuring the outputs. Be sure to evaluate the safety impact of the output configuration on your plant or process.

Publication 1404-IN007D-EN-P - October 2004

Other Warnings

Powermonitor 3000 7

Product Description

ATTENTION

The Bulletin 1404 Powermonitor 3000 is uniquely designed and developed to meet the needs of both producers of and users of electric power. A Powermonitor 3000 system consists of:

• Master Module which provides metering and native RS-485

communications

• Optional Display Module for configuration, commands and data

display

• Optional communications port to serve data to other devices

using a choice of networks

• Optional external devices and applications that display and

utilize data for reporting, control and management of power and energy usage

Electrostatic discharge can damage integrated circuits or semiconductors. Follow these guidelines when you handle the module.

• Touch a grounded object to discharge static

potential.

• Wear an approved wrist strap-grounding device.

• Do not open the module or attempt to service

internal components.

• If available, use a static safe workstation.

• When not in use, keep the module in its static

shield bag.

The Powermonitor 3000 is a microprocessor-based monitoring and control device ideally suited for a variety of applications including:

• Load Profiling - Using the configurable trending utility to log

power parameters such as real power, apparent power and demand, for analysis of power usage by loads over time.

• Demand Management - Understanding when and why demand

charges occur allows you to make informed decisions that reduce your electrical power costs.

• Cost Allocation - Knowing your actual energy costs promotes

manufacturing efficiencies.

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8 Powermonitor 3000

• Distribution System Monitoring - Using power parameters to

show power flow, system topology and distribution equipment status.

• Emergency Load Shedding - Monitoring power usage to

preserve system stability in the event of sudden utility outage.

• Power System Control - Managing system voltage, harmonic

distortion and power factor.

The Powermonitor 3000 is a sophisticated modern alternative for traditional electro-mechanical metering devices. A single Powermonitor 3000 can replace many individual transducers and meters. The Powermonitor 3000 is operator-friendly and provides the user with easy to understand, accurate information in a compact economical package.

Master Module

The Master Module contains the main microprocessor-based monitoring functions, including terminations for power system connections, status inputs, control outputs, a native RS-485 communications port and a port for the Display Module

Configuration

Although the Powermonitor 3000 ships from the factory with default settings, you will need to configure it for your particular requirements. You may configure the Powermonitor 3000 using the optional Display Module. Alternately, you may use an external device or application to write configuration, operational parameters and commands to the Master Module through its native or optional communications port. Refer to the Powermonitor 3000 User Manual, publication 1404-UM001 for additional detail.

Optional external applications that you may use for Powermonitor 3000 configuration include RSPower32™ and RSEnergyMetrix™ software operating on a personal computer. Contact your local Rockwell Automation sales office or distributor, or visit http://www.software.rockwell.com/ for more information on available software packages.

Publication 1404-IN007D-EN-P - October 2004

Powermonitor 3000 9

Communications

Every Powermonitor 3000 comes with a native RS-485 communications port. The RS-485 port may be configured to use the Allen-Bradley DF1 half-duplex slave protocols or Modbus slave. The native port is suitable for communicating to master devices including:

• PLC-5, SLC 500 and ControlLogix processors

• RSLinx software with DDE/OPC server functionality

• Modbus RTU Master devices

• Other third-party devices

• Software that you develop

You may also specify Powermonitor 3000 units with optional communications ports including:

• Serial RS-232 (DF1 half-duplex or Modbus RTU slave)

• Remote I/O

• DeviceNet

• EtherNet/IP

• ControlNet

 RTU

A Powermonitor 3000 may be easily integrated into a programmable controller or computer based control and monitoring system, using any of the communications methods listed above.

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10 Powermonitor 3000

wermonitor 3000

Terminal Blocks

Figure 3 Master Module with Communication Options

Removable Status Input Connector

LED Indicators

Powermonitor 3000

Optional RS-232 Port

Optional Remote I/O Port

Powermonitor 3000

Optional DeviceNet Port

Display Module Port

RS-485 (Native) Communications Port

Powermonitor 3000

Auxiliary Port (not used)

Optional Ethernet 10BaseT

Port

(Series A)

Powermonitor 3000

NAP Port

ControlNet Channel A

ControlNet Channel B

Powermonitor 3000

Optional Ethernet 10BaseT

Port

(Series B)

Display Module

Publication 1404-IN007D-EN-P - October 2004

The Bulletin 1404 Display Module is an optional user interface device. The Display Module provides the most economical and simplest method for setting up and configuring the Master Module for operation.

The Display Module has a highly visible, two-line LED display and four operator buttons with tactile feedback. Use the buttons and display to navigate through a series of menus for configuration, commands and data display.

Powermonitor 3000 11

Powermonitor 3000

RS-485

The Display Module is shipped with a 3-meter (10 ft) long, shielded 4-pair cable that provides power and serial communications between the Master Module and the Display Module. The Display Module fits into a standard ANSI four inch analog meter cutout for panel mounting. Only one Display Module may be connected to a Master Module, although you may use one Display Module to configure and monitor any number of Master Modules; one at a time.

Figure 4 Display Module

LED Indicators

Figure 5 LED Indicators

MODULE STATUS

The Powermonitor 3000 is equipped with six bi-color light emitting diodes (LED’s) arranged as shown in

Figure 5.

The three LED’s on the left display the same information on Powermonitor 3000 modules with any communication option including native RS-485 communications only. The three LED’s on the right have different labels and different indications depending on the communications option selected, as shown in the charts below.

Table 6 LED Indicators All Powermonitor 3000 Models

LED LED Color LED State and Communications

Condition

Module Status Off Control power is off or insufficient

Steady Red Major fault; internal self-test has failed. If a

power cycle does not correct the problem, call customer support

Steady Green Powermonitor 3000 is operating normally

RS-485 RX Off The RS-485 bus is idle; no active data is

present

Flashing Green Active data is present on the RS-485 bus

RS-485 TX Off Powermonitor 3000 is not transmitting data

onto the RS-485 bus

Flashing Green Powermonitor 3000 is transmitting data

onto the RS-485 bus

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12 Powermonitor 3000

Powermonitor 3000

Table 7 Native RS-485 Communications only (catalog numbers ending in -000)

LED LED Color LED State and Communications

Condition

Powermonitor 3000

}

RS-232

F1 Off Not Used

F2 Off Not Used

F3 Off Not Used

Table 8 RS-232 Optional Communications (catalog numbers ending in -232)

LED LED Color LED State and Communications

Condition

F1 Off Not Used

RS-232 RX Off The RS-232 bus is idle; no active data is

present

Flashing Green Powermonitor 3000 is receiving data.

RS-232 TX Off The Powermonitor 3000 is not transmitting

any data onto the RS-232 bus

Flashing Green The Powermonitor 3000 is transmitting

data.

Table 9 Remote I/O Optional Communications (catalog numbers ending in -RIO)

LED LED Color LED State and Communications

Condition

F1 Off Not Used

F2 Off Not Used

R I/O

Publication 1404-IN007D-EN-P - October 2004

R I/O Off Remote I/O communications has not been

established

Flashing Green Remote I/O communications has been

established but there are errors

Steady Green Remote I/O communications has been

established

Powermonitor 3000

NETWORK STATUS

Powermonitor 3000 13

Table 10 DeviceNet Optional Communications (catalog numbers ending in -DNT)

LED LED Color LED State and Communications

Condition

F1 Off Not Used

F2 Off Not Used

NETWORK STATUS Off Power is off or the Powermonitor 3000 is

not online

Flashing Green Network status is OK, no connections

established

Steady Green Network status is OK, connections

established

Flashing Red Recoverable communications failure; port is

restarting

Steady Red Non-recoverable communications error;

check wiring and configuration parameters

Powermonitor 3000

LINK

Table 11 Ethernet Optional Communications (Series A catalog numbers ending in

-ENT)

LED LED Color LED State and Communications

Condition

LINK Off Ethernet connection is inactive

Steady Green Ethernet connection is active

RX Off Ethernet is idle, no active data present on

port

Flashing Red Active data is present on Ethernet port

TX Off Powermonitor 3000 is not transmitting any

data through the Ethernet port

Flashing Red Powermonitor 3000 is transmitting data

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14 Powermonitor 3000

Powermonitor 3000

LNK

ACT

NETWORK STATUS

Table 12 Ethernet/IP Optional Communications (Series B catalog numbers ending in -ENT)

LED LED Color LED State and Communications

Condition

LNK Off No valid physical Ethernet connection

Steady Green Valid physical Ethernet connection

ACT Strobing or

Solid Yellow

F1 Off Not Used

F2 Off Not Used

NETWORK STATUS Off No power

Flashing Green No established connections

Steady Green Connected; has at least one established

Flashing Red Connection timeout; one or more

Steady Red Duplicate IP; the IP address assigned to this

Flashing Green/Red Selftest; this device is performing a

Powermonitor 3000 transmitting onto Ethernet

connection

connections to this device has timed-out

device is already in use

power-up self test

Powermonitor 3000

CHAN A

CHAN B

NETWORK STATUS

Table 13 ControlNet Optional Communications (catalog numbers ending in -CNT)

LED LED Color LED State and Communications

Condition

CHAN A and

CHAN B

Status Off Normal operation

Off No power or Channel disabled

Steady Red Faulted unit

Alternating red/green

Alternating red/off Incorrect node configuration

Steady green Normal operation

Flashing green/off Temporary errors or node is not configured

Flashing red/off Media fault or no other nodes present on

Flashing red/green Incorrect network configuration

Flashing green Communication card power-up self-test

Self-test

to go on-line

network

Publication 1404-IN007D-EN-P - October 2004

Powermonitor 3000 15

Quick Start Guidelines

The Powermonitor 3000 may be used in many electric power monitoring and control systems. Whether your Powermonitor 3000 is a complete power and energy monitor or a component in a plant- or enterprise-wide energy management system, there are a few basic steps to follow to make your unit operational.

1. Install your Powermonitor 3000 master module within a suitable

enclosure.

2. Install your optional Display Module. Refer to the Installation

Instructions included with the Display Module, publication 1404-IN005.

3. Determine your Wiring Mode and install wiring between the

Powermonitor 3000 and your power system. Connect control power wiring, preferably from a separate source of control power. If used, connect wiring to the status inputs, Form C control relay, and KYZ solid-state outputs. Master Module on page 20.

4. Configure the potential transformer (PT) and current transformer

(CT) ratios to match those used in your power system connections. Configure the Voltage Mode of the Powermonitor 3000 to match your power system configuration.

Refer to Installation on page 15.

Refer to Wiring of

Installation

5. Configure Powermonitor 3000 communications. This step varies

depending upon the communications option you have selected.

6. Configure other optional performance features such as Setpoint

Control, Data Logging, etc.

Refer to the Powermonitor 3000 User Manual, publication 1404-UM001, for complete information on configuring and operating your Powermonitor 3000.

Only qualified personnel should install, wire, service and maintain this equipment. Refer to and follow the safety guidelines found starting at page 6 and pay attention to all warnings and notices in these instructions.

Publication 1404-IN007D-EN-P - October 2004

16 Powermonitor 3000

Prevent Electrostatic Discharge

ATTENTION

Electrostatic discharge can damage integrated circuits or semiconductors. Follow these guidelines when you handle the module.

• Touch a grounded object to discharge static

potential.

• Wear an approved wrist strap grounding device.

• Do not open the module or attempt to service

internal components.

• If available, use a static safe work station.

• When not in use, keep the module in its static

shield bag.

Mounting of Master Module

Mount the Powermonitor 3000 Master Module in a suitable protective enclosure. Select an enclosure that will protect the Master Module from atmospheric contaminants such as oil, water, moisture, dust corrosive vapors and other harmful airborne substances. The enclosure should also protect against personnel contact with energized circuits. The ambient temperature within the enclosure must remain within the limits listed in the Specifications,

page 61.

Publication 1404-IN007D-EN-P - October 2004

Select an enclosure that will provide adequate clearance for ventilation and wiring for the Powermonitor 3000 and other equipment to be installed within the enclosure. Figure 42 for dimensions and spacing guidelines for the Powermonitor 3000.

Mount the Master Module so that the metal grounding clips on the bottom of the mounting feet make direct contact with the enclosure mounting panel. If the mounting panel is painted, scrape or sand the paint down to bare metal. Use star washers to assure good long-term electrical contact with the mounting panel. Ensure that the mounting panel is properly connected to a low-impedance earth ground.

Mount the enclosure in a position that allows full access to the Powermonitor 3000 Master Module. Install the Master Module with the ventilation slots in the bottom and top of the unit unobstructed to assure adequate free convection cooling of its internal electronic components.

See Figure 41 and

Powermonitor 3000 17

System Accuracy Considerations

IMPORTANT

See Figure 41 on page 56 for mounting hole dimensions. Mount the Master Module with four (4) No. 8-32 UNC or M4 screws with flat washers and lock washers.

User supplied potential transformers (PTs) and current transformers (CTs), as well as wiring from the CTs to the Powermonitor, may reduce the accuracy of your Powermonitor 3000 system. The quality of the Powermonitor 3000’s measurements can be no better than the quality of the signals presented to its input terminals. It is the user’s responsibility to select transformers that are adequate for the desired metering accuracy.

ANSI/IEEE C57.13, Requirements for Instrument Transformers, defines three classes of transformer accuracy: class 1.2, class 0.6, and class 0.3. The application should dictate the transformer accuracy class to be used.

Use caution not to block the ventilation slots of the Master Module. All wiring and other obstructions must be a minimum of 50 mm (2.0 inches) from the top and bottom of the unit.

PTs and CTs may introduce errors in three areas: ratio errors, phase errors, and bandwidth errors.

Ratio Errors

The voltage ratio of a PT is the number of primary turns of wire divided by the number of secondary turns. Manufacturing tolerances may cause the ratio to be slightly different than the design specifies, causing an error affecting the voltage input to the Powermonitor 3000.

Likewise, the current ratio of a CT is a function of the ratio of the number of turns of wire on the primary and secondary. Some error in this ratio is quite common in commercial grade PTs and CTs.

Other errors include magnetic core losses, winding impedance, and the burden, or load, on the transformer secondary. The combination of these errors is known as “Ratio Error”. You may compensate for Ratio Error, if known, by adjusting the Basic Configuration entries for PT and CT primary or secondary voltages.

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18 Powermonitor 3000

For a PT the Ratio Error increases as the transformer’s load current increases, so its total load impedance should be as high as possible. Conversely, a CT’s Ratio Error increases as the voltage supported by the transformer secondary increases, so its total load impedance, including the impedance of the wire connecting the CTs to the metering device, should be as low as possible. This is why #12 AWG or larger is usually recommended for wiring CTs with a 5 amp secondary rating.

Phase Error

Phase shift between the primary to secondary signals is another source of inaccuracy introduced by the user-supplied PTs and CTs. Phase shift is generally not of concern for simple voltage or current measurements. When these signals are combined, for instance when calculating line to line voltage or phase power, the effect of phase shift can become significant. The difference in phase error among different transformers causes measurement errors. If all the PTs and CTs introduced a five-degree phase shift, there would be no error in the measured quantities. If on the other hand the PTs had a phase error of one degree and the CTs had a phase error of six degrees, there would be a five-degree phase error in the power calculation. This would show up as power factor and reactive power (VAR) errors. Phase errors can not be corrected by adjusting the Powermonitor 3000 configuration since the errors change based on varying conditions of the power system.

Publication 1404-IN007D-EN-P - October 2004

A typical PT phase error varies from ±1° to ±0.25° depending on the PT’s accuracy class. Applying higher than rated voltage increases the phase error and may saturate the transformer and cause even larger errors.

The phase error in a CT increases as its current decreases, and is lowest when the current is greater than 80% of the CT rating. Because significant phase error can occur when CT current is less than 20% of rated current, CTs sized for protection do not perform well when used for metering.

The phase error of both PTs and CTs are also affected by the power factor of the load on the secondary. For best accuracy, loads should be resistive, with PT loads as high as possible and CT loads as low as possible.

Powermonitor 3000 19

Bandwidth Error

For fundamental 50 Hz or 60 Hz measurements, bandwidth error has no affect on accuracy. However, for waveforms with significant harmonic content, the user-supplied PTs and CTs may attenuate higher harmonics. Most instrument quality PTs have a flat frequency response out to 3 kHz, or the 50th harmonic on a 60 Hz system. Current transformers, especially older, existing units, tend to be less linear, with a flat response only out to 300 Hz, or the fifth (60 Hz) harmonic. Wide-band instrument CTs are available for improved frequency response. Bandwidth error cannot be corrected by adjusting the Powermonitor 3000 configuration.

In addition, operation of either the PTs or CTs at extremely low frequencies may also cause saturation and resulting magnitude and phase errors.

For more detailed information on instrument transformer accuracy and power measurement, refer to publication 1403-1.0.2, “Bulletin 1403 Powermonitor II Tutorial”.

Wiring

ATTENTION

Wiring of the Powermonitor 3000 includes the following steps:

• Connection of voltage and current signals from PTs and CTs

• Connection of control power

• Connection of status inputs and status/control outputs

• Communications wiring

Please follow these guidelines to help assure reliable, trouble-free operation of your Powermonitor 3000.

Publication 1404-IN007D-EN-P - October 2004

20 Powermonitor 3000

• Install and connect all wiring in a neat and workmanlike

manner. Use wire tags to identify connections. Bundle wiring neatly and maintain a minimum of 50 mm (2.0 inches) clearance from the Master Module ventilation slots to avoid a buildup of heat within the unit

• Furnish and install properly-selected fuses for voltage signals

and control power

• Use 600 volt wiring rated at 75°C (167°F) or higher. We strongly

recommend the use of flame-retardant wire rated VW-1 by Underwriters Laboratories

• Use a shorting terminal block (provided by customer) for CT

wiring, to permit servicing connected equipment such as the Powermonitor 3000 Master Module without de-energizing the power system

• Use ring lugs or locking spade lugs for voltage and current

connections to provide additional wiring security and safety

• Pay careful attention to correct phasing and polarity for proper

operation

• Connect the Master Module to a low-impedance earth ground

using its grounding terminal and a dedicated grounding wire at least as large as the largest current-carrying wire connected to the Master Module. Keep grounding wiring as short as possible. To obtain maximum EMI immunity, the Master Module mounting feet should make electrical contact with the mounting panel. Refer to Mounting of Master Module on page 16 for additional information.

• Connect all equipment ground terminals (Master Module, PT

and CT secondary) to a single point, low impedance earth ground

Publication 1404-IN007D-EN-P - October 2004

For information on wire sizes and types for grounding electrical equipment, refer to publication 1770-4.1, Industrial Automation Wiring and Grounding Guidelines for Noise Immunity or the National Electric Code published by National Fire Protection Association (NFPA).

Wiring of Master Module

Terminal Blocks Wire Sizes and Screw Torques - Observe all wire lug sizes and screw torques.

Refer to Technical Specifications on page 59.

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