ROOTECH Accura 3700 User guide

Energy Solution for

Human & Nature

Digital Power Quality Meter

Accura 3700

Accura 3700 Rear

Expansion Modules

Accura 3700 DIO module

Accura 3700 AI module

Accura 3700 RTD module

Accura 3700 DI module

Accura 3700 AO module

Accura 3700 ELD module

Accura 3700 DO module

Accura 3700 A4D2 module

Accura 3700 DC module

Accura 3700 A2D4 module

Accura 3700 User Guide

Notice

Page 3

Notice

Symbols

Caution

Indicates the presence of dangerous voltage which can cause severe injury or death to

persons if proper precautions are not followed.

Caution

Alerts the user of the presence of hazards which can cause some injury to persons, damage

to property or damage to the device itself, if proper precautions are not followed.

Note

Indicates instructions for installation, operating and maintenance.

Indicates alternative voltage or current.

Indicates direct voltage or current.

Installation Considerations

The installation and operation of Accura 3700 should be performed only by qualified, competent personnel

that have received appropriate training and experience with high voltage and current devices.

Caution

Failure to observe the following instructions may result in severe injury or death.

◼ During normal operation of Accura 3700, hazardous voltages are present on its terminal strips that

connect the PT(Potential Transformer), CT(Current Transformer), voltage input, power, and external

I/O circuits. The secondary of the PT/CT may generate fatal voltages/currents resulting from the

primary of the PT/CT.

◼ Standard safety precautions should be followed while installing or maintaining the product, including

removing PT fuses and shorting CT secondaries.

◼ Install the product in a switchgear cabinet to prevent users from accessing terminal strips after

completing wiring of the product.

Notice

Accura 3700 User Guide

Page 4

Caution

Observe the following instructions, or permanent damage may occur to the product.

◼ Do not apply voltages and currents that exceed input ratings of PT and CT to the product.

◼ Using the device for other purposes not specified by the manufacturer can cause severe damage to

the product.

◼ Connect the chassis ground terminal of the product to the earth ground to protect the device from

noise and surge. Failure to properly connect the chassis ground will void the warranty of the product.

◼ The terminal screw torque to be used has the following features.

- Barrier-type voltage terminal: 1.35Nm (14 kgf∙cm = 1.00 lbf∙ft) max.

- Barrier-type digital inputs/digital output terminal: 0.90Nm (9 kgf∙cm = 0.66 lbf∙ft) max.

About the Manual

Rootech, Inc. reserves the right to make changes in the device specifications shown in this User Guide

without notice. Therefore, we recommend that customers should obtain the latest information on

specifications of the device before making orders.

In the absence of written agreements, Rootech, Inc. assumes no liability for assistance with product

applications and the system design created by customers or legal issues, including infringement of

intellectual property arising from the use of devices described herein by third-parties.

We are committed to providing accurate information in this document. However, we assume no

responsibility for any errors in the document and reserves the right to make changes without notice.

Limitation of Liability

Where applicable law allows and does not prohibit or restrict such limitation, Rootech, Inc’s liability for

this product shall be limited to the amount actually paid by customers for the product.

Accura 3700 User Guide

Warranty

Page 5

Warranty

Rootech, Inc. provides warrants for two years from the product receipt date only to the original purchaser

of the products and software that are sold or licensed by the company.

To obtain warranty service, the purchased products should be free from serious defects in material and

workmanship.

The software is provided in up-to-date versions, thus we do not offer any warranty for the software product.

In order to make a product claim under the warranties described above, the original purchaser should

immediately contact Rootech headquarters. Upon receiving claims, Rootech will check out the product

either at where the purchaser is or at the company after receiving the product from the customer, who is

responsible for the cost of shipping the product. After inspecting the product, we provide repair or

replacement services for the product.

Rootech will decide at its discrete whether to repair or replace it or give a refund for the product for when

the warranty period for the product expired or issues related to the product are not applicable for warranty

terms and conditions.

Limitation of Warranty

The Warranty does not apply to uninterrupted or error-free operation of the product or cover normal wear

and tear of the product or costs caused by the removal, installation, or troubleshooting of the customer's

electrical systems.

Defects caused by any of the following factors are not covered under the warranty.

◼ Improper use(alteration, accident, misuse, abuse) or failure to act in accordance with installation,

operation or maintenance instructions

◼ Unauthorized modifications, changes or repair attempts

◼ Failure to comply with applicable safety standards & regulations

◼ Damages resulting from transporting or storing the product

◼ Damages caused by the force majeure event, including fire, flood, earthquakes, storm damage,

overvoltage & lightning

◼ If the original identification marks(trade-mark, serial number, etc.) have been defaced, altered, or

removed

Rootech shall not be liable for any other claims except the claims made by customers, including the

original purchaser, his employees, agents, or contractors for any loss, damage, or expense incurred related

Warranty

Accura 3700 User Guide

Page 6

to the purchased product when the above warranty terms and conditions are not fulfilled.

Any technical assistance provided by Rootech's personnel or representatives in system design shall be

deemed to be a suggestion. The original purchaser is responsible for determining the feasibility of such

suggestions and should conduct tests to prove their feasibility

It is the original purchaser’s responsibility to determine the suitability of any product and associated

documentation. The original purchaser should acknowledge that 100% uptime is not guaranteed because

of possible hardware or software defects. The original purchaser should also recognize that such defects

and failures may cause inaccuracies or malfunctions.

No agency, corporate entity, or employee of Rootech or other companies has authority to amend, modify

or extend the terms and conditions of this warranty in any way without express written authorization from

Rootech, Inc.

Standard Compliance

Process Control Equipment

E324900

MSIP-REM-RTE-ACCURA 3700

Accura 3700 User Guide

Revision History

Page 7

Revision History

The following versions of 「Accura 3700 User Guide」 has been released.

Revision

Date

Description

Revision 1.0B

February 22, 2013

First issue

Revision 1.10

January 7, 2014

First revision

Revision 1.11

February 5, 2014

Modified content on the AI module

Revision 1.12

February 18, 2014

Added content on the IEC 61000-4-30 standard

Revision 1.13

May 21, 2015

Updated the standards

Revision 1.14

July 13, 2015

Changed the product dimensions

Revision 1.15

October 24, 2016

Added the bookmark

Revision 1.16

September 20, 2017.

Changed the UL certification code

Revision 1.17

January 2, 2018

Changed content on the notice and warranty sections

Revision 1.20

September 10, 2018

Changed the color of the Event backlight to white

Added Accura 3700-1A model

Added content on reactive energy and active energy data available via

communication

Extended the setup range for the output pulse energy scale

Revision 1.30

July 6, 2020

Added descriptions of RS-485 communication address

Added content on the number of modules that can be connected at a

baud rate of 115200

Changed some terms, including the meter

Included the power consumption data updated according to the

changed specification of the DI module

Added new setup items and event logs

Added phase open and fuse fail events only supported in 3P4W

connection

Added the Timed Latch function for the DO module

Revision 1.31

October 5, 2020

Modified errors in indicating the maximum and minimum values of

the Available Measurement Data

Added the setup screen for the timed latch function of the DO

module

Added the flow chart for data aggregation

Modified content on the predicted demand and added content on

thermal demand

Revision 1.32

March 19, 2021

Changed the hysteresis value of AI channels, subnet mask setup range,

and the product weight

Deleted the logo for the standards

Modified content on display/setup mode according to the hardware

revision

Revision 1.33

August 17, 2021

Updated specifications related to standards

Contents 
Accura 3700 User Guide 
 
Page  8 
ⓒ 2013 Rootech Inc. All Rights Reserved 
 
Contents 
Chapter 1 Product Introduction ....................................................................................................................................... 15 
Overview ....................................................................................................................................................................... 15 
Applications ................................................................................................................................................................. 17 
Product Information ................................................................................................................................................... 18 
Product Features........................................................................................................................................................................................ 19 
Chapter 2 Installation ......................................................................................................................................................... 22 
Conditions for Installation ........................................................................................................................................ 22 
Before Installation ...................................................................................................................................................... 23 
Product Appearance ................................................................................................................................................................................ 23 
Components ................................................................................................................................................................................................ 26 
Dimensions ................................................................................................................................................................................................... 26 
Step 1: Panel Mounting ............................................................................................................................................. 28 
Panel Mounting of Accura 3700 ........................................................................................................................................................ 28 
Step 2: Voltage/Current Input Wiring ..................................................................................................................... 29 
Step 3: Connections of Accura 3700 Modules for External Communication ................................................... 37 
Ethernet Communication ...................................................................................................................................................................... 37 
RS-485 Communication ......................................................................................................................................................................... 39 
Step 4: Power Supply/Ground Connection of Accura 3700 ................................................................................ 41 
Power Supply Connection ..................................................................................................................................................................... 41 
Ground Connection.................................................................................................................................................................................. 41 
Step 5: Attaching Expansion Modules to Accura 3700 ........................................................................................ 42 
Step 6: Wiring I/O Modules ...................................................................................................................................... 43 
DIO Module ................................................................................................................................................................................................. 43 
DI Module ..................................................................................................................................................................................................... 47 
DO Module .................................................................................................................................................................................................. 49 
AI Module ..................................................................................................................................................................................................... 51 
AO Module ................................................................................................................................................................................................... 52 
A4D2/A2D4 Module ................................................................................................................................................................................ 53 
RTD Module ................................................................................................................................................................................................. 57 
ELD Module ................................................................................................................................................................................................. 59 
DC Module ................................................................................................................................................................................................... 62 
Chapter 3 Operation/Setup ............................................................................................................................................... 66 
LED Status Indicators............................................................................................................................................................................... 66 
LCD Control Buttons ................................................................................................................................................................................ 67 
Display Mode ............................................................................................................................................................... 68 
Front View..................................................................................................................................................................................................... 68 
Preparation Time for Start-up ............................................................................................................................................................. 69 
Button Operation ...................................................................................................................................................................................... 69 

Accura 3700 User Guide   
Contents 
 
ⓒ 2013 Rootech Inc. All Rights Reserved 
Page  9 
 
Full-Screen View in Display Mode .................................................................................................................................................... 70 
Measurement Parameter Screen ....................................................................................................................................................... 71 
Viewing Expansion Module Status ................................................................................................................................................... 79 
Display Screen for Individual Expansion Modules .................................................................................................................... 81 
Setup Mode ................................................................................................................................................................. 89 
Button Operation ...................................................................................................................................................................................... 89 
Full Screen in Setup Mode ................................................................................................................................................................... 90 
Demo............................................................................................................................................................................................................... 93 
Measurement Setup ................................................................................................................................................................................ 94 
Event Setup ................................................................................................................................................................................................ 100 
RS-485 Communication Setup ......................................................................................................................................................... 111 
Ethernet Communication Setup ....................................................................................................................................................... 113 
Reset Setup ................................................................................................................................................................................................ 116 
Display Setup ............................................................................................................................................................................................ 118 
Module Setup ........................................................................................................................................................................................... 122 
Setup for Individual Expansion Modules..................................................................................................................................... 123 
Full Screen for Module Setup ........................................................................................................................................................... 124 
DI Module Setup ..................................................................................................................................................................................... 125 
DO Module Setup................................................................................................................................................................................... 126 
DIO Module Setup ................................................................................................................................................................................. 131 
AI Module Setup ..................................................................................................................................................................................... 131 
AO Module Setup ................................................................................................................................................................................... 137 
A4D2 Module Setup .............................................................................................................................................................................. 140 
A2D4 Module Setup .............................................................................................................................................................................. 141 
RTD Module Setup ................................................................................................................................................................................. 142 
ELD Module Setup.................................................................................................................................................................................. 145 
DC Module Setup ................................................................................................................................................................................... 148 
Information Setup ................................................................................................................................................................................... 158 
Event Mode ................................................................................................................................................................ 160 
Event Notifications ................................................................................................................................................................................. 160 
Clearing Event Notifications .............................................................................................................................................................. 161 
Button Operation .................................................................................................................................................................................... 161 
Event Log Number ................................................................................................................................................................................. 162 
Event Timestamp ..................................................................................................................................................................................... 162 
Dip Event Log ........................................................................................................................................................................................... 163 
Swell Event Log ........................................................................................................................................................................................ 164 
Fuse Fail Event Log................................................................................................................................................................................. 166 
Blackout Event Log ................................................................................................................................................................................. 167 
Event Log of DI Channels ................................................................................................................................................................... 168 
Event Log of AI Channels .................................................................................................................................................................... 169 
Event Log of Open RTD Sensor ....................................................................................................................................................... 170 
User-triggered Event Log .................................................................................................................................................................... 175 
3-Phase Dip Event Log ......................................................................................................................................................................... 175 

Contents

Accura 3700 User Guide

Page 10

No Event Logs .......................................................................................................................................................................................... 175

Required Setup Steps ............................................................................................................................................... 176

Chapter 4 Measurements ................................................................................................................................................ 178

General Measurement .............................................................................................................................................. 178

Measurement Event .................................................................................................................................................. 181

Measurements According to Voltage Wiring ...................................................................................................... 182

3-Phase 4-Wire ......................................................................................................................................................................................... 182

3-Phase 3-Wire ......................................................................................................................................................................................... 183

1-Phase 3-Wire ......................................................................................................................................................................................... 185

1-Phase 2-Wire ......................................................................................................................................................................................... 186

Measurement of Voltage Dip(Sag)/Swell ............................................................................................................. 187

Residual Voltage Measurement .............................................................................................................................. 188

Residual Current Measurement .............................................................................................................................. 188

Power Measurement Per Phase .............................................................................................................................. 189

Three-phase Power Measurements ....................................................................................................................... 190

Power Factor(PF) Measurement ............................................................................................................................. 191

Phase Angle Measurement ..................................................................................................................................... 192

Demand Measurement ............................................................................................................................................ 193

Voltage Harmonics ................................................................................................................................................... 195

Current Harmonics ................................................................................................................................................... 195

Unbalance(NEMA MG1) ........................................................................................................................................... 196

Negative-Sequence/Zero-Sequence Unbalance .................................................................................................. 197

Aggregation ............................................................................................................................................................... 198

Appendix A Specifications ............................................................................................................................................... 200

Appendix B Standards ...................................................................................................................................................... 202

Appendix C Accuracy/Reliability .................................................................................................................................... 203

Accuracy ...................................................................................................................................................................................................... 203

Reliability ..................................................................................................................................................................................................... 204

Appendix D Ordering Information ................................................................................................................................. 205

Accura 3700 User Guide   
Figures 
 
ⓒ 2013 Rootech Inc. All Rights Reserved 
Page  11 
 
Figures 
Fig 2.1 Accura 3700 Front .................................................................................................................................................................... 23 
Fig 2.2 Accura 3700 Side ...................................................................................................................................................................... 23 
Fig 2.3 Accura 3700 Rear ...................................................................................................................................................................... 23 
Fig 2.4 Accura 3700 DIO Module ..................................................................................................................................................... 24 
Fig 2.5 Accura 3700 DI Module ......................................................................................................................................................... 24 
Fig 2.6 Accura 3700 DO Module....................................................................................................................................................... 24 
Fig 2.7 Accura 3700 AI Module ......................................................................................................................................................... 24 
Fig 2.8 Accura 3700 AO Module ....................................................................................................................................................... 24 
Fig 2.9 Accura 3700 A4D2 Module .................................................................................................................................................. 24 
Fig 2.10 Accura 3700 A2D4 Module ............................................................................................................................................... 25 
Fig 2.11 Accura 3700 RTD Module .................................................................................................................................................. 25 
Fig 2.12 Accura 3700 ELD Module ................................................................................................................................................... 25 
Fig 2.13 Accura 3700 DC Module ..................................................................................................................................................... 25 
Fig 2.14 Accura 3700 Components .................................................................................................................................................. 26 
Fig 2.15 I/O Module Components ................................................................................................................................................... 26 
Fig 2.16 Accura 3700 Front .................................................................................................................................................................. 26 
Fig 2.17 Accura 3700 Rear .................................................................................................................................................................... 26 
Fig 2.18 Accura 3700 Side .................................................................................................................................................................... 27 
Fig 2.19 Accura 3700 I/O Module   Front/Side/Height.......................................................................................................... 27 
Fig 2.20 Panel Mounting of Accura 3700 (ANSI 4”) ................................................................................................................ 28 
Fig 2.21 Panel Mounting of Accura 3700 (DIN96) ................................................................................................................... 28 
Fig 2.22 Voltage/Current Input Wiring ........................................................................................................................................... 29 
Fig 2.23 3P4W Connection with 3 PTs and 3 CTs ..................................................................................................................... 31 
Fig 2.24 3P3W Connection with 2 PTs and 3 CTs ..................................................................................................................... 32 
Fig 2.25 3P3W Connection with 2 PTs and 2 CTs ..................................................................................................................... 32 
Fig 2.26 1P3W Connection with 2 PTs and 2 CTs ..................................................................................................................... 33 
Fig 2.27 1P2W Connection with 1 PT and 1 CT ........................................................................................................................ 33 
Fig 2.28 3P4W Direct Voltage Connection with 3 CTs ........................................................................................................... 34 
Fig 2.29 3P3W Direct Voltage Connection with 3 CTs ........................................................................................................... 34 
Fig 2.30 3P3W Direct Voltage Connection with 2 CTs ........................................................................................................... 35 
Fig 2.31 1P3W Direct Voltage Connection with 2 CTs ........................................................................................................... 35 
Fig 2.32 1P2W Direct Voltage Connection with 1 CT ............................................................................................................. 36 
Fig 2.33 Accura 3700 Ethernet Communication Ports ............................................................................................................ 37 
Fig 2.34 Accura 3700 Ehternet Connection ................................................................................................................................. 38 
Fig 2.35 RS-485 Communication of Accura 3700 ..................................................................................................................... 39 
Fig 2.36 Connection of Accura 3700 Devices for RS-485 Communication .................................................................. 39 

Figures 
Accura 3700 User Guide 
 
Page  12 
ⓒ 2013 Rootech Inc. All Rights Reserved 
 
Fig 2.37 Power Supply Connection of Accura 3700 ................................................................................................................ 41 
Fig 2.38 I/O Module Attachment ...................................................................................................................................................... 42 
Fig 2.39 DIO Module ............................................................................................................................................................................... 43 
Fig 2.40 Digital Input (Redundant Input Structure) ................................................................................................................. 44 
Fig 2.41 DC Relay Application ............................................................................................................................................................ 45 
Fig 2.42 AC Relay Application ............................................................................................................................................................ 46 
Fig 2.43 DI Module .................................................................................................................................................................................. 47 
Fig 2.44 Digital Input (Redundant Input Structure) ................................................................................................................. 48 
Fig 2.45 DO Module ................................................................................................................................................................................ 49 
Fig 2.46 DC Relay Application ............................................................................................................................................................ 50 
Fig 2.47 AC Relay Application ............................................................................................................................................................ 50 
Fig 2.48 AI Module................................................................................................................................................................................... 51 
Fig 2.49 Analog Input ............................................................................................................................................................................. 51 
Fig 2.50 AO Module ................................................................................................................................................................................ 52 
Fig 2.51 Analog Output of AO Module ......................................................................................................................................... 52 
Fig 2.52 A4D2 Module ........................................................................................................................................................................... 53 
Fig 2.53 A2D4 Module ........................................................................................................................................................................... 53 
Fig 2.54 Analog Output of A4D2/A2D4 Module....................................................................................................................... 54 
Fig 2.55 DC Relay Application ............................................................................................................................................................ 55 
Fig 2.56 AC Relay Application ............................................................................................................................................................ 56 
Fig 2.57 RTD Module .............................................................................................................................................................................. 57 
Fig 2.58 RTD Input ................................................................................................................................................................................... 58 
Fig 2.59 ELD Module ............................................................................................................................................................................... 59 
Fig 2.60 ZCT Input .................................................................................................................................................................................... 59 
Fig 2.61 DC Relay Application ............................................................................................................................................................ 61 
Fig 2.62 AC Relay Application ............................................................................................................................................................ 61 
Fig 2.63 DC Module................................................................................................................................................................................. 62 
Fig 2.64 DC Voltage/Current ............................................................................................................................................................... 62 
Fig 2.65 Digital Input(Redundant Input Structure) ................................................................................................................... 63 
Fig 2.66 DC Relay Application ............................................................................................................................................................ 65 
Fig 2.67 AC Relay Application ............................................................................................................................................................ 65 
Fig 3.1 Accura 3700 Front .................................................................................................................................................................... 66 
Fig 3.2 Accura 3700 Front View ......................................................................................................................................................... 68 
Fig 3.3 Main Screen in Display Mode ............................................................................................................................................. 71 
Fig 3.4 Voltage/Current/Power Display Screen Per Phase .................................................................................................... 71 
Fig 3.5 Detailed Line-to-Line Voltage Value Display Screen ............................................................................................... 72 
Fig 3.6 Detailed Phase Current Value Display Screen ............................................................................................................. 72 
Fig 3.7 Detailed Power Value Display Screen .............................................................................................................................. 73 

Accura 3700 User Guide   
Figures 
 
ⓒ 2013 Rootech Inc. All Rights Reserved 
Page  13 
 
Fig 3.8 Detailed Demand Active Power Value Display Screen............................................................................................ 73 
Fig 3.9 NET Energy Display Screen on the Energy Display Screen .................................................................................. 74 
Fig 3.10 Ethernet Connection Status Display Screen .............................................................................................................. 75 
Fig 3.11 Error Status Display Screen of Port 1 ........................................................................................................................... 76 
Fig 3.12 Information on the Partner Device Connected to Port 1 ................................................................................... 76 
Fig 3.13 IP Information on the Partner Device Connected to Port 1 ............................................................................. 77 
Fig 3.14 MAC Information on the Partner Device Connected to Port 1 ....................................................................... 77 
Fig 3.15 Surface Temperature Display Screen ............................................................................................................................ 78 
Fig 3.16 Module Page Screen Showing the ID of the Expansion Module ................................................................... 79 
Fig 3.17 Module Page Screen Showing the Channel Info of the 1st Expansion Module(Ex: DIO Module) 79 
Fig 3.18 Module Page Screen Showing the Channel Info of the 2nd Expansion Module(Ex: AI Module)... 80 
Fig 3.19 Main Screen of the DIO Module .................................................................................................................................... 82 
Fig 3.20 Main Screen of the DI Module ........................................................................................................................................ 83 
Fig 3.21 Main Screen of the DO Module ...................................................................................................................................... 83 
Fig 3.22 Main Screen of the AI Module ........................................................................................................................................ 84 
Fig 3.23 Main Screen of the AO Module ...................................................................................................................................... 85 
Fig 3.24 Main Screen of the A4D2 Module ................................................................................................................................. 85 
Fig 3.25 Main Screen of the A2D4 Module ................................................................................................................................. 86 
Fig 3.26 Main Screen of the RTD Module .................................................................................................................................... 86 
Fig 3.27 Main Screen of the ELD Module..................................................................................................................................... 87 
Fig 3.28 Main Screen of the DC Module ...................................................................................................................................... 88 
Fig 3.29 Dip Event Setup (3P3W) .................................................................................................................................................... 102 
Fig 3.30 Dip Event Setup (3P4W) .................................................................................................................................................... 103 
Fig 3.31 Swell Event Setup (3P3W) ................................................................................................................................................ 104 
Fig 3.32 Swell Event Setup (3P4W) ................................................................................................................................................ 105 
Fig 3.28 Dip(Sag) Event Notification Screen.............................................................................................................................. 160 
Fig 3.29 Swell Event Notification Screen ..................................................................................................................................... 160 
Fig 3.30 Example of the Event Log Number ............................................................................................................................. 162 
Fig 4.1 3P4W Connection with 3 PTs and 3 CTs ..................................................................................................................... 182 
Fig 4.2 3P3W Connection with 2 PTs and 3 CTs ..................................................................................................................... 183 
Fig 4.3 1P3W Connection with 2 PTs and 2 CTs ..................................................................................................................... 185 
Fig 4.4 1P2W Connection with 1 PT and 1 CT ......................................................................................................................... 186 
Fig 4.5 Calculation of 1-Cycle RMS Values Refreshed Each Half Cycle ........................................................................ 187 
Fig 4.6 Voltage Dip(Sag) Detection ................................................................................................................................................ 187 
Fig 4.7 Vector Sum for the Total Apparent Power.................................................................................................................. 190 
Fig 4.8 Arithmetic Sum for the Total Apparent Power ......................................................................................................... 191 
Fig 4.9 PF Sign and Phase Angle (Leading/Lagging) ............................................................................................................ 192 
Fig 4.10 Demand Calculation ............................................................................................................................................................ 193 

Figures

Accura 3700 User Guide

Page 14

Fig 4.11 Predicted Demand Calculation ...................................................................................................................................... 194

Fig 4.13 Current Data Processing with the FFT ....................................................................................................................... 195

Fig 4.14 Symmetrical Components ................................................................................................................................................ 197

Accura 3700 User Guide

Chapter 1 Product Introduction

Page 15

Chapter 1 Product Introduction

Overview

Power Quality Management for Switchgear Panels

Various power quality problems such as Dips(Sags)/Swells often occur in switchgear panels due to issues

related to power supply, power facilities, and loads. Thus, energy managers should devise proper preventive

measures by effectively analyzing power quality and identifying causes of problems.

±0.2% of Reading/ IEC62053-22 Class 0.2S Accuracy

Recently, it has become essential to establish an enterprise-wide energy management system for efficient

energy usage at sites such as plants, factories, and buildings due to greenhouse gas emission regulations.

The measurement accuracy of power meters is a key factor that determines the reliability of the energy

management system. Accura 3700 provides high accuracy of ±0.2% of reading for voltage and current

measurement and meets IEC62053-22 class 0.2S for power and energy measurement. This makes it possible

to precisely analyze and diagnose various problems in energy management at power facilities.

True RMS Measurement

Accura 3700 performs true RMS measurements for high power non-linear loads using 128 samples per

cycle.

A Variety of Power Quality Data Available: Dip(Sag)/Swell (IEC61000-4-30]

Accura 3700 provides a wide variety of power quality data, including Dip(Sag), Swell, harmonics(up to 63rd

order), Crest factor, K-factor, and unbalance. It allows energy managers to easily identify changes in power

quality in various switchgear panels at power facilities, enabling effective power quality management.

Power quality data conform to IEC61000-4-30.

Max/Min/Average Values Available at Aggregation Intervals

Accura 3700 provides the average values measured with 0.2-second intervals based on the values measured

over 1 cycle. Based on the average value for the 0.2-second intervals, Accura 3700 provides the average

values for 1-second, 5-second, 1-minute, 5-minute, 1-hour and 6-hour intervals. An aggregation interval

indicates the measurement interval that is longer than 0.2 seconds.

Via communication, Accura 3700 provides not only the average values of the measurement parameters for

the 0.2-second interval, but also the maximum/minimum/average values of voltage, current and power for

each aggregation interval. Since it offers measurement data that change instantaneously at the aggregation

interval, it allows for accurate trend analysis of voltage, current and power quality.

Chapter 1 Product Introduction

Accura 3700 User Guide

Page 16

Proven Safety and Reliability with CE/UL/ KCC/FCC Certifications

The internal and external structures of Accura 3700(equipment and circuit design) meet safety and reliability

requirements for CE(EN61326-1, EN61326-2-1), UL(UL61010-1), KC(KN22, KN24), FCC(Part15 B) standards.

Additional Functions Available with Expansion Modules

Accura 3700 allows you to easily connect expansion modules to the back of the device, providing a range

of additional functions to better suit your needs in the field. Expansion modules include the DIO, DI, DO,

analog input, analog output, analog/pulse output, RTD input, leakage current measurement and DC

measurement modules. Using expansion modules is optional. It is possible to add up to three modules

regardless of connection sequence, and the same type of modules can be connected redundantly. However,

for DI and AO modules, you can redundantly connect up to two modules.

Accura 3700 User Guide

Chapter 1 Product Introduction

Page 17

Applications

Highly Reliable Energy Management

Efficient energy management is essential in power quality management, cost management, demand power

management, power facility replacement, and energy planning in conjunction with upper-level programs.

The accuracy of digital meters is one of the most important factors that determines the reliability of energy

measurement data. Accura 3700 provides ±0.2% of high accuracy reading for voltage and current

measurement and meets IEC62053-22 class 0.2S for power and energy measurement. It allows for the

establishment of accurate energy management systems.

Accurate Analysis of Energy Usage and Power Quality for Devising Proper Energy Efficiency Measures

Accura 3700 provides various data needed for energy usage management, power facility management,

power quality management and analysis and management of high-efficiency facilities. This enables energy

managers to make proper energy efficiency measures based on accurate analysis of energy usage and

power quality.

Enterprise-wide Energy Management System

Installed at various switchgear panels in power facilities, Accura 3700 provides essential power quality data

needed for energy management, along with Accura 2300(2300S)/2350 mounted on branch loads inside

distribution panels. This allows for truly efficient enterprise-wide energy management systems by providing

measurement data for both switchgears and distribution panels.

Chapter 1 Product Introduction

Accura 3700 User Guide

Page 18

Product Information

Accura 3700 is a high-accuracy power quality meter which provides accurate power measurements as per

IEC62053-22 Class 0.2S. It also offers the Dip/Swell detection function in accordance with IEC61000-4-30

and allows for analysis of harmonics in up to 63rd order.

Accura 3700 also provides various I/O functions to meet the needs of different applications in the field .

You can use I/O functions by attaching I/O modules to the rear of Accura 3700. Various modules are

available according to the configuration of I/O channels. Up to three modules can be attached regardless

of connection sequence. However, for DI and AO modules, up to two modules can be connected.

Type

Model

Description

Power quality meter

Accura 3700

Measures voltage, current, and power

Measures power quality

Supports Ethernet(star, daisy-chain, ring connection) and RS-485

communication

Provides surface temperature data with the built-in sensor on the

side of the device 1

Digital I/O module

DIO module

8 DI channels, 2 DO channels 2

DI

12 DI channels

DO

6 DO channels 2

Analog I/O module

AI

6 AI channels

AO

6 AO channels 3

Digital and analog

A4D2

4 AO channels 3 + 2 DO channels 2

I/O module

A2D4

2 AO channels 3 + 4 DO channels 2

Special-purpose module

RTD

3 RTD input channels

Supports PT100 and PT1000

Supports 2-Wire, 3-Wire, and 4-Wire connection

ELD

Uses voltage-type ZCT

6 leakage current input channels, 1 DO channel 2

DC

1 DC voltage input channel, 2 DC current input channels, 4 DI

channels, 1 DO channel 2

1. It is not for fire detection, but for reference only. (Accura 3700 has a temperature sensor on the side)

2. DO channels support latches, timed latches, a single pulse, periodic pulses and pulse energy.

3. AO channels output various electrical quantities measured by the device or communication command values by

converting them into values between 0 and 20 mA.

Accura 3700 User Guide

Chapter 1 Product Introduction

Page 19

Product Features

Accura 3700 Power Quality Meter

Accura 3700 performs voltage and current measurements with ±0.2% of reading accuracy. For

power/energy measurements, it meets the IEC62053-22 Class 0.2S standard. It also provides various

information such as Dip(Sag), Swell, harmonics(up to the 63rd order), Crest factor, K-factor, and unbalance,

which are essential for the power quality management of switchgear panels.

Accura 3700

Functions

Measurement

Display

Shows real-time measurement data on the LCD

display

Displays analog graphics corresponding to

measurement data

General

Samples/cycle

128

Commercial frequency

50/60 Hz

True RMS measurement

Voltage, current: ±0.2% reading

Frequency

42 – 69 Hz

Residual current(fundamental waveform)

Demand, Peak demand, Predicted demand 1, 2

Maximum, minimum values

Maximum 2, minimum 2, average 2 value

within the aggregation interval 3

Energy

Received energy, Delivered energy

IEC62053-22 Class 0.2S

Net energy (received - delivered energy)

IEC62053-22 Class 0.2S

Total energy (received + delivered energy)

IEC62053-22 Class 0.2S

Power Quality

Voltage/current harmonics

Up to the 63rd order

Voltage/Current THD 4, current TDD 5

Up to the 63rd order

Crest factor 6, 2, K-factor 7, 2

Dip(Sag), Swell

IEC61000-4-30

Voltage unbalance, current unbalance 2

IEC61000-4-30, NEMA MG1

Vector diagram 2

Graphs for harmonic analysis(voltage, current) 2

Oscilloscope 2

Event

Dip(Sag), Swell event detection

Half-cycle sliding-window RMS

values measured over 1 cycle

Digital Input, analog input event detection 8

1 msec

Number of event logs

Up to 500

Connection of Expansion Modules

Number of I/O expansion modules which can be

connected to the rear of the meter

Up to 3 modules

(up to 2 DI and AO modules)

Chapter 1 Product Introduction

Accura 3700 User Guide

Page 20

Temperature

Number of the temperature sensor on the side of

the device 9

1

Communication

Ethernet (100Mbps/Full Duplex, Ethernet switching

10, RSTP 11, Modbus TCP protocol)

2 ports (Ethernet 1, Ethernet 2)

RS-485(1200 – 115200 bps, Modbus RTU protocol)

1 port (Ta, Tb)

Control Power Supply

Power supply

AC 85 – 265 V / DC 100 – 300 V

1. Predicted demand power is calculated with the assumption that the current thermal demand value is maintained

during the remaining demand subinterval.

2. The data are not displayed on the LCD screen of Accura 3700. The data are available only via communication.

3. Accura 3700 provides statistic data, including the maximum, minimum, and average values for voltage,

current, and power within the aggregation interval via communication. As it includes the data on the measurement

parameter which changes instantaneously, it allows for accurate trend analysis on voltage, current and power quality.

4. THD(Total Harmonic Distortion). Voltage THD: 





 , Current THD: 







5. TDD(Total Demand Distortion). Current TDD: 







But,  can be set to the rated current(default) or peak demand current (through communication).

6. Crest factor: 

, 7. K-factor: 













8. The function is available when the modules are connected.

9. It is not for fire detection, but for reference only. (Accura 3700 has a temperature sensor on the side)

10. The built-in Ethernet switch allows for Ethernet connection between Accura 3700 modules, without the need for

an additional, external switch.

11. RSTP(Rapid Spanning Tree Protocol), IEEE 802.1D-2004

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ROOTECH Accura 3700 User guide

ROOTECH Accura 3700 User guide

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