ROOTECH ACCURA 3700 Series User manual

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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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
ⓒ2013 Rootech Inc. All Rights Reserved
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